Turn any number of minutes into decimal hours and HH:MM, and turn hours back into minutes, with the working shown.
Enter any number of minutes. You get the answer as a decimal, as HH:MM and in every other unit at once.
In hours
1.50
90 minutes is 1 hour and 30 minutes
Enter hours as a decimal such as 2.75, or as hours and minutes.
In minutes
165
2.75 hours is 165 minutes
To convert minutes to hours, divide the number of minutes by 60, so 90 minutes is 1.5 hours and the same span written on a clock is 1:30. There are two correct answers to every minutes to hours question and they look different on the page. The decimal answer, 1.5, is what payroll, invoices and spreadsheets want. The clock answer, 1:30, is what schedules, rosters, oven timers and video players want. Both describe exactly the same length of time. The mistake that costs people money is writing one and reading it as the other.
hours (decimal) = minutes ÷ 60 90 ÷ 60 = 1.5 hours (HH:MM) = whole hours : remainder 90 = 1 hour and 30 min → 1:30 45 min = 0.75 h = 0:45 120 min = 2.00 h = 2:00 90 min = 1.50 h = 1:30 480 min = 8.00 h = 8:00A minutes to hours converter takes a single number, a count of minutes, and returns that same quantity of time in every format anyone is likely to ask you for. Type 90 into the box at the top of this page and you get 1.5 decimal hours, 1:30 in hours and minutes, 01:30:00 in hours, minutes and seconds, 5,400 seconds, 0.0625 days and 0.00893 weeks. Nothing is sent anywhere, the arithmetic happens in your browser, and the result updates as you type.
The conversion itself is a single division. Sixty minutes make an hour, so the number of hours is the number of minutes divided by 60. That is the whole rule, and it never changes: there is no leap-minute, no daylight saving adjustment and no regional variation. An hour is 60 minutes in every country, in every calendar system in common use, and in every payroll package ever written.
What makes the conversion worth a page of its own is not the division. It is the second step, the one people skip. Dividing 130 by 60 gives 2.1666 and change, so 130 minutes is 2.17 hours. But the same 130 minutes written on a clock is 2:10, because 130 minutes is two whole hours with 10 minutes left over. Those two answers, 2.17 and 2:10, are equally correct and they share nothing after the decimal point. Read 2.17 as two hours seventeen minutes and you have just invented seven minutes that do not exist.
The tool has two tabs, because the question gets asked in both directions:
If you need to add several durations together before converting the total, do the addition on the Time Calculator and bring the result here. If your raw figure is in seconds rather than minutes, start at the Seconds to Minutes converter. If you already have a clock reading such as 7:45 and only need the decimal for a timesheet, the Decimal Hours Converter is the shorter path.
Everything below the tool is the reference material: a chart covering every minute value people actually look up, the reverse chart from 0.25 hours to 24 hours, the rounding rules, six worked examples and a plain accounting of the errors this conversion produces when it is done in a hurry.
Four steps and about ten seconds. Both tabs recalculate as you type, so there is no need to press anything if you would rather not.
Stay on Minutes to Hours if you have a minute count and want hours. Switch to Hours to Minutes if you have a figure such as 2.75 hours and need the minutes behind it.
Enter any number, whole or fractional. The presets for 45, 90, 120, 480 and 1440 fill the box in one press. Negative values and decimals such as 92.5 are accepted.
Take the decimal hours figure for payroll, invoices and spreadsheets. Take HH:MM for schedules, rosters and anything a human reads as a clock. Seconds, days and weeks sit alongside for scaling.
Open the steps panel under the result and you can see the division, the whole hours, the remainder and the final HH:MM value. It is the same arithmetic you would do on paper, laid out line by line.
Converting a single value is one press. Adding up a week of shifts and then converting the total is a different job: use the Hours Calculator to sum the entries first, or the Time Card Calculator if the entries are clock-in and clock-out punches.
Two lines of arithmetic produce both answers. The first line gives the decimal, the second gives the clock reading.
decimal hours = minutes ÷ 60 whole hours = the integer part of (minutes ÷ 60) loose minutes = minutes − (whole hours × 60) clock reading = whole hours : loose minutes, padded to two digits
Worked on 130 minutes, that reads: 130 ÷ 60 = 2.1666 recurring, so the decimal answer is 2.17 hours. The integer part is 2, so there are 2 whole hours. Two whole hours account for 2 × 60 = 120 minutes, and 130 − 120 = 10, so 10 minutes are left loose. The clock reading is 2:10. Both figures are exact statements about the same 130 minutes.
The second calculation is what mathematicians call a division with remainder, and what programmers call integer division plus modulo. It is the same operation you learned for turning 17 sevenths into 2 remainder 3. Time is one of the few places in adult life where remainder arithmetic still earns its keep, because the clock refuses to be decimal and always will.
Minutes and seconds are inherited from Babylonian astronomy, which counted in base 60. Sixty is unusually rich in divisors: it splits cleanly into halves, thirds, quarters, fifths, sixths, tenths, twelfths, fifteenths, twentieths and thirtieths. That is why a third of an hour is a tidy 20 minutes rather than the 33.33 minutes it would be if hours had 100 minutes in them. The convenience for the clock is exactly what causes the friction with the decimal system that money and spreadsheets use.
The practical consequence is that only some minute counts turn into short, tidy decimals. A minute count converts to a decimal that terminates within two places precisely when the count is a multiple of 3. Three minutes is 0.05 hours, 6 minutes is 0.1, 9 minutes is 0.15, 27 minutes is 0.45 and 57 minutes is 0.95. Every other minute count produces a recurring decimal: 10 minutes is 0.16666 recurring, 20 minutes is 0.33333 recurring, 50 minutes is 0.83333 recurring. That is not a flaw in your calculator. It is a fact about the number 60, which carries a factor of 3 that the number 100 does not.
Three shortcuts cover most of the values people meet:
For anything longer than a couple of hours, or anything that has to be right the first time, use the converter. Mental arithmetic on base 60 is reliable for two or three terms and unreliable after that, which is the same reason the Time Duration Calculator exists.
Same duration, two notations, one very common collision. Knowing which one your destination expects is most of the job.
Payroll, invoicing, project budgets, cost models and spreadsheet formulas all multiply hours by a rate. You cannot multiply 2:10 by an hourly rate, but 2.17 works in any cell. Decimal hours are the format that lets time behave like an ordinary number.
Rosters, oven timers, running plans, class schedules, film runtimes and video players all show hours and minutes. Telling a colleague a task takes 2.17 hours forces them to do a conversion. Telling them 2 hours 10 minutes does not.
This is the entire problem in one sentence. In a clock reading such as 2:10, the digits after the colon count up to 60. In a decimal such as 2.17, the digits after the point count up to 100. They are measuring the same leftover in two different units, so they almost never look alike, and when they do look alike it is usually a coincidence that makes things worse.
Take the six values people search for most and set the two notations beside each other. 45 minutes is 0.75 hours but 0:45. 70 minutes is 1.17 hours but 1:10. 90 minutes is 1.50 hours but 1:30. 100 minutes is 1.67 hours but 1:40. 130 minutes is 2.17 hours but 2:10. 150 minutes is 2.50 hours but 2:30. In every case, reading the decimal digits as minutes gives the wrong duration, and reading the clock minutes as decimal digits gives a different wrong duration.
The 1.30 trap. Somebody works 90 minutes and writes it on the timesheet as 1.30 hours, reasoning that 90 minutes is one hour and thirty minutes. The correct decimal is 1.50. The entry has just lost 12 minutes of paid time. Repeat that five days a week and it is an hour of unpaid work a week, or roughly 52 hours a year. The same error runs the other way when 1.30 hours on an invoice is delivered as 1 hour 30 minutes of work, which is 18 minutes more than was billed.
Write the unit. A figure that ends in "h" or is labelled "hours" is decimal, so 2.17 h leaves no doubt. A figure written with a colon is a clock reading, so 2:10 leaves no doubt. Problems appear when the label is dropped and the value lands in a column headed simply "Time". If you are designing a form or a spreadsheet, put the unit in the column header, and consider storing total minutes as an integer, which is unambiguous and never rounds.
Some systems complicate matters by displaying a duration as HH:MM while storing it internally as a fraction of a day. That is what a spreadsheet does. A cell containing 2:10 formatted as a duration holds the number 0.0902777, because 130 minutes is 130 divided by 1,440 minutes in a day. To turn that cell into decimal hours you multiply by 24. This is the single most useful spreadsheet fact on this page, and it is covered again in the Decimal Hours Converter.
Every value people look up, in one place, with both notations side by side. Decimal hours are shown to four places where the division recurs and to two where it is exact.
| Minutes | Decimal hours | HH:MM | Seconds | In plain English |
|---|---|---|---|---|
| 5 | 0.0833 | 0:05 | 300 | 5 minutes |
| 10 | 0.1667 | 0:10 | 600 | 10 minutes, a sixth of an hour |
| 15 | 0.25 | 0:15 | 900 | A quarter of an hour |
| 20 | 0.3333 | 0:20 | 1,200 | A third of an hour |
| 25 | 0.4167 | 0:25 | 1,500 | 25 minutes |
| 30 | 0.50 | 0:30 | 1,800 | Half an hour |
| 35 | 0.5833 | 0:35 | 2,100 | 35 minutes |
| 40 | 0.6667 | 0:40 | 2,400 | Two thirds of an hour |
| 45 | 0.75 | 0:45 | 2,700 | Three quarters of an hour |
| 50 | 0.8333 | 0:50 | 3,000 | 50 minutes |
| 55 | 0.9167 | 0:55 | 3,300 | 55 minutes |
| 60 | 1.00 | 1:00 | 3,600 | 1 hour |
| 75 | 1.25 | 1:15 | 4,500 | 1 hour 15 minutes |
| 90 | 1.50 | 1:30 | 5,400 | 1 hour 30 minutes, an hour and a half |
| 100 | 1.6667 | 1:40 | 6,000 | 1 hour 40 minutes |
| 105 | 1.75 | 1:45 | 6,300 | 1 hour 45 minutes |
| 120 | 2.00 | 2:00 | 7,200 | 2 hours |
| 135 | 2.25 | 2:15 | 8,100 | 2 hours 15 minutes |
| 150 | 2.50 | 2:30 | 9,000 | 2 hours 30 minutes |
| 165 | 2.75 | 2:45 | 9,900 | 2 hours 45 minutes |
| 180 | 3.00 | 3:00 | 10,800 | 3 hours |
| 210 | 3.50 | 3:30 | 12,600 | 3 hours 30 minutes |
| 240 | 4.00 | 4:00 | 14,400 | 4 hours |
| 270 | 4.50 | 4:30 | 16,200 | 4 hours 30 minutes |
| 300 | 5.00 | 5:00 | 18,000 | 5 hours |
| 360 | 6.00 | 6:00 | 21,600 | 6 hours, a quarter of a day |
| 420 | 7.00 | 7:00 | 25,200 | 7 hours |
| 480 | 8.00 | 8:00 | 28,800 | 8 hours, a standard shift |
| 540 | 9.00 | 9:00 | 32,400 | 9 hours |
| 600 | 10.00 | 10:00 | 36,000 | 10 hours |
| 720 | 12.00 | 12:00 | 43,200 | 12 hours, half a day |
| 900 | 15.00 | 15:00 | 54,000 | 15 hours |
| 1,080 | 18.00 | 18:00 | 64,800 | 18 hours, three quarters of a day |
| 1,440 | 24.00 | 24:00 | 86,400 | 24 hours, one full day |
Note how the HH:MM column and the decimal column agree only at the quarter marks, where the minutes are 0, 15, 30 or 45. Everywhere else the two readings diverge, which is exactly the point of keeping both columns visible. For durations that need adding together before conversion, take them to the Time Duration Calculator first.
Above a day the numbers stop being memorable, so here are the anchors. A day is 1,440 minutes. A week is 10,080 minutes, which is 168 hours. A 30-day month is 43,200 minutes and a 31-day month is 44,640. A common year of 365 days is 525,600 minutes, the number a certain musical made famous, and a leap year of 366 days is 527,040. Divide any of those by 60 and you have the hours: 168 for a week, 720 for a 30-day month, 8,760 for a 365-day year.
The values people type into a search box, answered in both notations. If your number is not here, put it in the converter above.
| Question | Decimal hours | HH:MM | Said out loud |
|---|---|---|---|
| How many hours is 45 minutes | 0.75 | 0:45 | Three quarters of an hour |
| How many hours is 60 minutes | 1.00 | 1:00 | Exactly one hour |
| How many hours is 70 minutes | 1.17 | 1:10 | One hour and ten minutes |
| How many hours is 75 minutes | 1.25 | 1:15 | An hour and a quarter |
| How many hours is 80 minutes | 1.33 | 1:20 | One hour and twenty minutes |
| How many hours is 90 minutes | 1.50 | 1:30 | An hour and a half |
| How many hours is 100 minutes | 1.67 | 1:40 | One hour and forty minutes |
| How many hours is 110 minutes | 1.83 | 1:50 | One hour and fifty minutes |
| How many hours is 120 minutes | 2.00 | 2:00 | Exactly two hours |
| How many hours is 130 minutes | 2.17 | 2:10 | Two hours and ten minutes |
| How many hours is 140 minutes | 2.33 | 2:20 | Two hours and twenty minutes |
| How many hours is 150 minutes | 2.50 | 2:30 | Two and a half hours |
| How many hours is 160 minutes | 2.67 | 2:40 | Two hours and forty minutes |
| How many hours is 180 minutes | 3.00 | 3:00 | Exactly three hours |
| How many hours is 200 minutes | 3.33 | 3:20 | Three hours and twenty minutes |
| How many hours is 210 minutes | 3.50 | 3:30 | Three and a half hours |
| How many hours is 240 minutes | 4.00 | 4:00 | Exactly four hours |
| How many hours is 300 minutes | 5.00 | 5:00 | Exactly five hours |
| How many hours is 360 minutes | 6.00 | 6:00 | Exactly six hours |
| How many hours is 400 minutes | 6.67 | 6:40 | Six hours and forty minutes |
| How many hours is 480 minutes | 8.00 | 8:00 | Exactly eight hours, one shift |
| How many hours is 600 minutes | 10.00 | 10:00 | Exactly ten hours |
| How many hours is 720 minutes | 12.00 | 12:00 | Twelve hours, half a day |
| How many hours is 1,000 minutes | 16.67 | 16:40 | Sixteen hours and forty minutes |
| How many hours is 1,440 minutes | 24.00 | 24:00 | Twenty four hours, one whole day |
Decimal figures are rounded to two places for readability. The exact values for the recurring ones are 1.1666 recurring for 70 minutes, 1.6666 recurring for 100, 2.1666 recurring for 130 and 16.6666 recurring for 1,000. If you need those to more places, the converter at the top of this page shows them, and the Time Calculator carries full precision through longer sums.
Going back is a multiplication rather than a division, and it has its own trap: the fractional part is not the minutes.
minutes = hours × 60 2.75 h × 60 = 165 minutes → 2 hours 45 minutes → 2:45 6.40 h × 60 = 384 minutes → 6 hours 24 minutes → 6:24 0.25 h × 60 = 15 minutes → 0 hours 15 minutes → 0:15
The trap is reading 2.75 hours as 2 hours 75 minutes. It is not. The 0.75 is three quarters of an hour, and three quarters of 60 is 45, so 2.75 hours is 2 hours 45 minutes. Reading it as 75 minutes would add half an hour that nobody worked and nobody owes. The rule is simple: multiply the fractional part by 60, and remember that the fractional part can never legitimately produce a number of 60 or more.
The second tab of the converter also carries an extra minutes box, which exists because people frequently hold a mixed value. If a task took 2 hours and 20 minutes, you do not have to convert the 20 minutes into 0.3333 first. Put 2 in the hours box, put 20 in the extra minutes box, and the total comes back as 140 minutes.
| Hours | Minutes | HH:MM | Seconds | Where you meet it |
|---|---|---|---|---|
| 0.25 | 15 | 0:15 | 900 | The standard payroll rounding increment |
| 0.5 | 30 | 0:30 | 1,800 | A short meeting, a sitcom with adverts |
| 0.75 | 45 | 0:45 | 2,700 | A fitness class, a school lesson block |
| 1 | 60 | 1:00 | 3,600 | The base unit for every rate of pay |
| 1.25 | 75 | 1:15 | 4,500 | A long yoga or spin class |
| 1.5 | 90 | 1:30 | 5,400 | A university lecture, a football match |
| 1.75 | 105 | 1:45 | 6,300 | A match including the half time break |
| 2 | 120 | 2:00 | 7,200 | A typical feature film runtime |
| 2.25 | 135 | 2:15 | 8,100 | A long film, a half marathon |
| 2.5 | 150 | 2:30 | 9,000 | A short domestic flight |
| 2.75 | 165 | 2:45 | 9,900 | An exam session with reading time |
| 3 | 180 | 3:00 | 10,800 | An epic film, a long study block |
| 3.5 | 210 | 3:30 | 12,600 | A slow roast, a long training ride |
| 4 | 240 | 4:00 | 14,400 | A half shift, a marathon at four hours |
| 4.5 | 270 | 4:30 | 16,200 | A morning of billable client work |
| 5 | 300 | 5:00 | 18,000 | A transcontinental domestic flight |
| 5.5 | 330 | 5:30 | 19,800 | A short working day |
| 6 | 360 | 6:00 | 21,600 | A quarter of a day |
| 6.5 | 390 | 6:30 | 23,400 | A part time shift |
| 7 | 420 | 7:00 | 25,200 | A transatlantic flight, a school day |
| 7.5 | 450 | 7:30 | 27,000 | An eight hour shift minus a 30 minute lunch |
| 8 | 480 | 8:00 | 28,800 | The standard full shift |
| 8.5 | 510 | 8:30 | 30,600 | A shift with half an hour of overtime |
| 9 | 540 | 9:00 | 32,400 | A nine to six day with no break taken |
| 9.5 | 570 | 9:30 | 34,200 | A long day on site |
| 10 | 600 | 10:00 | 36,000 | A four day week shift pattern |
| 11 | 660 | 11:00 | 39,600 | The minimum daily rest gap in many rules |
| 12 | 720 | 12:00 | 43,200 | A nursing or emergency services shift |
| 14 | 840 | 14:00 | 50,400 | An ultra long haul flight |
| 16 | 960 | 16:00 | 57,600 | Waking hours on an eight hour sleep |
| 18 | 1,080 | 18:00 | 64,800 | Three quarters of a day |
| 20 | 1,200 | 20:00 | 72,000 | A long haul trip including connections |
| 22 | 1,320 | 22:00 | 79,200 | A day minus a two hour gap |
| 24 | 1,440 | 24:00 | 86,400 | One full day |
The HH:MM column here is a duration, not a clock time, which is why 24:00 is a valid entry. As a clock reading, 24:00 would be midnight at the start of the next day. If you are working with clock times rather than durations, the Military Time Converter handles the 00:00 and 24:00 edge, and the Countdown Timer counts a duration down in real time.
Three pictures of the same conversion: where the hour boundaries fall, where the two notations diverge, and how the popular values compare in length.
Most minute counts do not divide neatly by 60. How many decimal places you keep decides how much time quietly disappears.
Two decimal places is the format most payroll systems accept, and two places is not quite enough to hold a minute. One minute is 0.0166 recurring hours, so the smallest change two decimals can represent, 0.01, is 36 seconds. Rounding a recurring value to two places can therefore move the answer by up to 18 seconds in either direction. Three decimal places brings the worst case down to 1.8 seconds, which is small enough to ignore for any purpose short of billing by the second.
| Minutes | Exact decimal | 2 places | 3 places | Error at 2 places |
|---|---|---|---|---|
| 5 | 0.08333... | 0.08 | 0.083 | 12 seconds short |
| 10 | 0.16666... | 0.17 | 0.167 | 12 seconds long |
| 20 | 0.33333... | 0.33 | 0.333 | 12 seconds short |
| 25 | 0.41666... | 0.42 | 0.417 | 12 seconds long |
| 35 | 0.58333... | 0.58 | 0.583 | 12 seconds short |
| 40 | 0.66666... | 0.67 | 0.667 | 12 seconds long |
| 50 | 0.83333... | 0.83 | 0.833 | 12 seconds short |
| 55 | 0.91666... | 0.92 | 0.917 | 12 seconds long |
Every one of these is out by 12 seconds at two decimal places, because each recurring value sits exactly one third of a hundredth away from the nearest two-place figure. Minute counts that are multiples of 3 have no error at all: 3, 6, 9, 12, 15 and so on all terminate within two places.
Round once, at the end. Convert each entry to minutes, add the integers, and divide by 60 only when you have the final total. Rounding each day to two places and then adding five days can drift by a full minute, and rounding a hundred short entries can drift by twenty minutes. Integer minutes never round, which is why they are the safest thing to store. The Time Card Calculator keeps full precision across a week for exactly this reason.
Some workplaces round to a fixed increment rather than to a number of decimal places. Quarter-hour rounding snaps every value to 0.00, 0.25, 0.50 or 0.75, which means a 100-minute stretch of work becomes 1.75 hours rather than 1.67. Tenth-hour rounding, common in legal and agency billing, snaps to the nearest 0.1, which is a block of 6 minutes, so the same 100 minutes becomes 1.7 hours. Both are policies rather than arithmetic, and both should be neutral over time so that they do not consistently favour one side. Convert first, round second, and never the other way around.
Each one is solvable in the converter at the top of the page. The working is here so you can check your own method against it.
A gym session, a football match and a university lecture all run to 90 minutes. What is that in hours?
= 1.50 hours = 1:30 = 5,400 seconds
The listing says 137 minutes and the screening starts at 7:40 PM. When does it finish, and how long is it in hours?
2.28 h = 2:17 · ends at 9:57 PM
Five sessions logged as 75, 110, 45, 130 and 95 minutes. What is the weekly total in hours?
455 min = 7.58 h = 7:35
A time clock exports a shift as 487 minutes. The rate is $24.50 an hour. What goes on the payslip?
487 min = 8.117 h = 8:07 · $198.86
A phone reports 1,246 minutes for the week. How many hours is that, and what is the daily average?
20.77 h a week · 2:58 a day
An invoice line says 2.75 hours. How many minutes of work is that, and how would you put it in a diary?
2.75 h = 165 min = 2:45 = 9,900 seconds
Almost every source of duration data reports in minutes, and almost every place you want to put that data expects hours.
Time clocks and job trackers export integer minutes because minutes never round. Payroll wants decimal hours because wages are hours multiplied by a rate. The conversion sits between the two, and it is where most payroll disputes begin.
Recipes give total times in minutes once they pass an hour: a 95-minute roast, a 240-minute bulk ferment, a 480-minute overnight braise. Converting to hours tells you at a glance whether the dish fits the afternoon you have.
Fitness apps log every session in minutes, and weekly activity targets are usually stated in minutes too. Adding a week of sessions and converting the total is the quickest way to see whether the target was met.
Every listing states a runtime in minutes. Converting to hours and minutes tells you when a screening ends, and converting a shot list total tells an editor how far over the target length a cut is running.
Airlines publish block times in hours and minutes but schedule tools often hold them in minutes. A 315-minute sector is 5.25 hours, or 5:15, and knowing both makes a connection window easy to check.
Phones and browsers report usage in minutes per app and per day. Rolling seven daily figures into a weekly total in hours is the number that actually changes behaviour, because 1,246 minutes means nothing and 20.8 hours means a lot.
Study blocks are counted in minutes, often in 25-minute units, while revision targets are set in hours. Four blocks with breaks is 120 minutes, so a 20-hour revision plan is 40 blocks, which is a far more useful thing to know.
Task estimates arrive in minutes from the people doing the work and have to be reported in hours or days to everyone else. Summing minutes and converting once at the end avoids the drift that per-task rounding introduces.
Handover notes, observation intervals and medication schedules are all counted in minutes, while rosters and pay run in hours. Converting both ways accurately is a daily requirement rather than an occasional one.
| Activity | Minutes | Decimal hours | HH:MM |
|---|---|---|---|
| One focused study block | 25 | 0.4167 | 0:25 |
| Sitcom episode with adverts | 30 | 0.50 | 0:30 |
| Spin or circuit class | 45 | 0.75 | 0:45 |
| School lesson period | 50 | 0.8333 | 0:50 |
| Yoga class | 75 | 1.25 | 1:15 |
| University lecture | 90 | 1.50 | 1:30 |
| Football match with half time | 105 | 1.75 | 1:45 |
| Four study blocks plus breaks | 120 | 2.00 | 2:00 |
| Typical feature film | 120 | 2.00 | 2:00 |
| Long feature film | 137 | 2.2833 | 2:17 |
| Short domestic flight | 150 | 2.50 | 2:30 |
| Three hour epic film | 180 | 3.00 | 3:00 |
| Marathon at a four hour pace | 240 | 4.00 | 4:00 |
| Long haul flight sector | 420 | 7.00 | 7:00 |
| Shift minus a 30 minute lunch | 450 | 7.50 | 7:30 |
| Standard work shift | 480 | 8.00 | 8:00 |
| A full night of sleep at 8 hours | 480 | 8.00 | 8:00 |
| Twelve hour hospital shift | 720 | 12.00 | 12:00 |
| A week at three hours of screen time a day | 1,260 | 21.00 | 21:00 |
| One full day | 1,440 | 24.00 | 24:00 |
These are typical durations for planning, not fixed standards. Where a real span has a start and an end rather than a stated length, measure it with the Time Duration Calculator and bring the total back here for conversion.
Every wrong answer on this page traces back to one of these, and five of the seven come from confusing the two notations.
| Mistake | What it looks like | The fix |
|---|---|---|
| Writing the clock reading as a decimal | 90 min entered as 1.30 | Divide by 60. 90 minutes is 1.50 hours. The entry as written loses 12 minutes. |
| Reading a decimal as minutes | 1.67 read as 1 h 67 min | Multiply the fraction by 60. 1.67 hours is 1:40. A fraction can never exceed 59 minutes. |
| Dividing by 100 instead of 60 | 90 ÷ 100 = 0.9 hours | The divisor is always 60. 90 minutes is 1.5 hours, not 0.9. |
| Reading a decimal hour as hours plus minutes | 2.75 h read as 2 h 75 min | 0.75 × 60 = 45, so 2.75 hours is 2:45, half an hour less than the misreading. |
| Rounding every entry before adding | Five entries of 0.33 rather than 0.333 | Add the minutes as integers first, then divide once. Rounding early drifts by a minute a week. |
| Typing a clock value into a numeric cell | 2:10 in a cell formatted as a number | A spreadsheet stores it as a fraction of a day, 0.0902777. Multiply by 24 to get 2.1667 hours. |
| Confusing a duration with a clock time | 480 min taken as 8:00 AM | 480 minutes is a length of 8 hours. A duration has no AM or PM and can exceed 24:00. |
If your figures keep failing a payroll import, the cause is nearly always the first row of this table. Run the value through the converter above, or through the Decimal Hours Converter if you are starting from a clock reading rather than a minute count.
The exact meaning of each term used on this page, in one place.
Direct answers to the questions people ask most about this calculation.
90 minutes is 1.5 hours in decimal, and 1:30 as a clock reading, because 90 divided by 60 is 1.5 and 90 minutes is one whole hour with 30 minutes left over. Both answers describe the same span of time. Use 1.5 on a timesheet or in a spreadsheet, and 1:30 on a schedule or a timer. Writing it as 1.30 on a payroll form loses 12 minutes.
Divide the number of minutes by 60. That gives the decimal answer straight away, so 200 minutes divided by 60 is 3.33 hours. For the clock reading, take the whole number of hours, multiply it back by 60, and subtract: 200 minutes contains 3 whole hours, which is 180 minutes, leaving 20, so the reading is 3:20. The divisor is always 60 and never 100.
100 minutes is 1.667 hours, usually written 1.67, and 1:40 on a clock. The decimal recurs because 100 is not a multiple of 3, so the exact value is 1.6666 repeating. The clock reading comes from 100 minus 60, which leaves 40 loose minutes after one whole hour. Reading 1.67 as one hour and 67 minutes is a common error and is impossible, since a fraction of an hour cannot exceed 59 minutes.
130 minutes is 2.167 hours in decimal and 2:10 on a clock. This pair is the clearest illustration of why both formats matter: 2.17 and 2:10 share no digits after the separator, yet describe an identical span. The decimal comes from 130 divided by 60. The clock reading comes from two whole hours, 120 minutes, leaving a remainder of 10 minutes.
120 minutes is exactly 2 hours, written 2.00 in decimal and 2:00 as a clock reading. It is one of the few values where the two notations look identical, because the remainder is zero. Any minute count that is a multiple of 60 behaves this way: 180 is 3 hours, 240 is 4 hours, 480 is 8 hours and 1,440 is 24 hours.
150 minutes is 2.5 hours and 2:30 on a clock, which is two and a half hours. The value sits on a quarter mark, so the decimal is exact with no recurring digits. It is a common length for a short domestic flight or a long exam, and it is one of the few values where the decimal and the spoken description line up neatly.
480 minutes is exactly 8 hours, or 8:00 as a duration, which is the standard full work shift in most countries. It is also 28,800 seconds and one third of a day. Take a 30-minute unpaid lunch off it and you are left with 450 minutes, which is 7.5 hours, the figure that usually reaches payroll.
1,440 minutes is exactly 24 hours, which is one full day. It is also 86,400 seconds. A week is seven times that, so 10,080 minutes or 168 hours. As a duration, 24:00 is a perfectly valid reading, though as a clock time it would mean midnight at the start of the following day.
45 minutes is 0.75 hours, or three quarters of an hour, written 0:45 as a clock reading. It is one of the four quarter marks where the decimal is exact: 15 minutes is 0.25, 30 is 0.50 and 45 is 0.75. Writing 45 minutes as 0.45 hours understates the time by 18 minutes, because 0.45 hours is only 27 minutes.
Because the digits after a decimal point are hundredths of an hour while the digits after a colon are sixtieths. They measure the same leftover in different units. Ten minutes is a sixth of an hour, which as a decimal is 0.17 rather than 0.10. The two notations only line up when the remainder is 0, 15, 30 or 45 minutes.
Multiply the hours by 60. So 2.75 hours becomes 165 minutes, and 6.4 hours becomes 384 minutes. If you have a mixed value such as 3 hours 20 minutes, multiply only the whole hours and then add the loose minutes: 3 times 60 is 180, plus 20, giving 200 minutes. Never read 2.75 hours as 2 hours 75 minutes.
Keep three through every intermediate step and round to two only at the end. Two places cannot hold a single minute accurately, because one minute is 0.0167 hours and the smallest step two places can show is 0.01, which is 36 seconds. Rounding to two places can move a value by up to 18 seconds, and rounding each of a hundred entries can lose twenty minutes.
180 minutes is exactly 3 hours, written 3.00 in decimal and 3:00 as a duration. It is 10,800 seconds and one eighth of a day. Because 180 is a multiple of 60 the remainder is zero, so both notations agree and there is no rounding to worry about.
There are 60 minutes in an hour, 1,440 in a day and 10,080 in a week. A 30-day month holds 43,200 minutes and a 31-day month holds 44,640. A common 365-day year holds 525,600 minutes, and a leap year holds 527,040. Divide any of those by 60 for the hours: 24, 168, 720 and 8,760 respectively.