A LITTLE TOOL FOR YOUR WORKDAY
Convert working time in both directions. Instantly, clearly, and without a spreadsheet.
Equivalent duration: 7 hours 45 minutes
7 + 45 ÷ 60 = 7.75
01 / Calculation
45 of 60 minutes covers the same part of an hour as 75 of 100 hundredths. The duration stays the same — only its notation changes.
7 + 45 ÷ 60 = 7.7502 / Conversion table
Find a minute value at a glance. Every value is a fraction of one hour; the table uses two decimal places.
| Minutes | Decimal hours |
|---|---|
| 0 | 0.00 |
| 1 | 0.02 |
| 2 | 0.03 |
| 3 | 0.05 |
| 4 | 0.07 |
| 5 | 0.08 |
| 6 | 0.10 |
| 7 | 0.12 |
| 8 | 0.13 |
| 9 | 0.15 |
| 10 | 0.17 |
| 11 | 0.18 |
| 12 | 0.20 |
| 13 | 0.22 |
| 14 | 0.23 |
| 15 | 0.25 |
| 16 | 0.27 |
| 17 | 0.28 |
| 18 | 0.30 |
| 19 | 0.32 |
| 20 | 0.33 |
| Minutes | Decimal hours |
|---|---|
| 21 | 0.35 |
| 22 | 0.37 |
| 23 | 0.38 |
| 24 | 0.40 |
| 25 | 0.42 |
| 26 | 0.43 |
| 27 | 0.45 |
| 28 | 0.47 |
| 29 | 0.48 |
| 30 | 0.50 |
| 31 | 0.52 |
| 32 | 0.53 |
| 33 | 0.55 |
| 34 | 0.57 |
| 35 | 0.58 |
| 36 | 0.60 |
| 37 | 0.62 |
| 38 | 0.63 |
| 39 | 0.65 |
| 40 | 0.67 |
| Minutes | Decimal hours |
|---|---|
| 41 | 0.68 |
| 42 | 0.70 |
| 43 | 0.72 |
| 44 | 0.73 |
| 45 | 0.75 |
| 46 | 0.77 |
| 47 | 0.78 |
| 48 | 0.80 |
| 49 | 0.82 |
| 50 | 0.83 |
| 51 | 0.85 |
| 52 | 0.87 |
| 53 | 0.88 |
| 54 | 0.90 |
| 55 | 0.92 |
| 56 | 0.93 |
| 57 | 0.95 |
| 58 | 0.97 |
| 59 | 0.98 |
| 60 | 1.00 |
7.75
+ 8.25
03 / Hours
Decimal hours make it easier to add working time and multiply a duration by an hourly rate. For example, 7.75 hours × 20 = 155. Keep full precision while calculating and round the final result only when needed.
04 / The story of time
Why do our clocks count in sixties, while our calculations use tenths and hundredths? Two different traditions meet in one everyday number.
Our time system grew over centuries. Ancient Egyptian day divisions were one part of the story; Babylonian astronomers used base-60 calculations. The number 60 divides evenly by 2, 3, 4, 5, 6 and 10, making fractions particularly convenient. The first and second fractional places in that tradition are behind today's minutes and seconds.
Sources & image credits: NIST ↗During the French Revolution, decimal time divided a day into 10 hours, each hour into 100 minutes and each minute into 100 seconds. The system did not become a lasting everyday standard. This clock made by Pierre Basile Lepaute in 1795 shows decimal and conventional scales together.
That is not what this calculator does: here, an hour always remains 60 ordinary minutes. We only write it as a decimal number.
Sources & image credits: Science Museum Group ↗
05 / Common questions
Divide the minutes by 60. For a duration with whole hours, add those hours: 7 + 45 ÷ 60 = 7.75.
No. 0.50 × 60 = 30 minutes. Decimal digits describe a fraction of an hour, not a minute count.
1 ÷ 60 = 0.016666… hours. At two decimal places this rounds to 0.02. Choose more decimal places when you need a closer approximation.
Yes. 90 minutes gives 1.50 hours, and 38 hours 45 minutes gives 38.75 hours. This is a duration calculator, not a 24-hour clock.
To avoid accumulated rounding differences, add the original durations first and round the total afterwards. Your employer's billing rules are a separate matter.
Decimal hours express a duration as a decimal number of hours, for example 0.75 h. One hundredth of an hour is 0.01 h = 36 seconds. So 75 hundredths equal 0.75 h, which is 45 ordinary minutes.
MEGASHIFT
Regularly calculating your shifts? Megashift helps you plan your schedule, calculate working hours automatically and see your reports in one place.
Explore Megashift
Content checked: · Megashift
Sources & image credits: NIST · Science Museum Group · Wikimedia Commons
