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About the Time to Decimal Calculator
The time to decimal calculator converts time written in hours and minutes into decimal hours, and decimal hours back into hours and minutes. For example, 7 hours 45 minutes equals 7.75 hours.
It has two tabs. Time to decimal takes hours, minutes and seconds and returns decimal hours to 2 and 4 places, decimal minutes, total seconds and the time in words. Decimal to time takes a decimal number, in hours or minutes, and returns hours, minutes and seconds, clock format, total minutes and total seconds.
How to Use the Time to Decimal Calculator
- Pick the tab for the direction you need.
- For time to decimal, enter hours, minutes and seconds.
- For decimal to time, enter the decimal value and choose hours or minutes.
- Read the converted value in the result panel.
What Are Decimal Hours?
Decimal hours express time as one base 10 number. The part after the decimal point is a fraction of an hour: 0.5 is 30 minutes, 0.25 is 15 minutes and 0.1 is 6 minutes.
Payroll and billing systems need decimal hours because they multiply hours by a rate. 38 hours 45 minutes cannot be multiplied by $24, but 38.75 can: 38.75 × $24 = $930.
How to Convert Time to Decimal
Divide the minutes by 60 and the seconds by 3,600, then add both to the hours.
7 h 45 min = 7 + 0.75 = 7.75 hours
2 h 20 min = 2 + 0.3333 = 2.33 hours
1 h 7 min 30 s = 1 + 0.1167 + 0.0083 = 1.125 hours
Minutes to Decimal Hours Chart
| Minutes | Decimal hours | Minutes | Decimal hours | Minutes | Decimal hours |
|---|---|---|---|---|---|
| 1 | 0.02 | 21 | 0.35 | 41 | 0.68 |
| 2 | 0.03 | 22 | 0.37 | 42 | 0.70 |
| 3 | 0.05 | 23 | 0.38 | 43 | 0.72 |
| 4 | 0.07 | 24 | 0.40 | 44 | 0.73 |
| 5 | 0.08 | 25 | 0.42 | 45 | 0.75 |
| 6 | 0.10 | 26 | 0.43 | 46 | 0.77 |
| 7 | 0.12 | 27 | 0.45 | 47 | 0.78 |
| 8 | 0.13 | 28 | 0.47 | 48 | 0.80 |
| 9 | 0.15 | 29 | 0.48 | 49 | 0.82 |
| 10 | 0.17 | 30 | 0.50 | 50 | 0.83 |
| 11 | 0.18 | 31 | 0.52 | 51 | 0.85 |
| 12 | 0.20 | 32 | 0.53 | 52 | 0.87 |
| 13 | 0.22 | 33 | 0.55 | 53 | 0.88 |
| 14 | 0.23 | 34 | 0.57 | 54 | 0.90 |
| 15 | 0.25 | 35 | 0.58 | 55 | 0.92 |
| 16 | 0.27 | 36 | 0.60 | 56 | 0.93 |
| 17 | 0.28 | 37 | 0.62 | 57 | 0.95 |
| 18 | 0.30 | 38 | 0.63 | 58 | 0.97 |
| 19 | 0.32 | 39 | 0.65 | 59 | 0.98 |
| 20 | 0.33 | 40 | 0.67 | 60 | 1.00 |
Useful values to remember: 6 minutes = 0.10, 15 minutes = 0.25, 30 minutes = 0.50 and 45 minutes = 0.75.
How to Convert Decimal to Time
Keep the whole number as hours. Multiply the decimal part by 60 to get minutes. If minutes still have a decimal part, multiply it by 60 to get seconds.
3.6 h = 3 h + (0.6 × 60) = 3 h 36 min
1.21 h = 1 h + 12.6 min = 1 h 12 min 36 s
| Decimal hours | Hours and minutes | Clock format |
|---|---|---|
| 0.1 | 6 min | 0:06 |
| 0.2 | 12 min | 0:12 |
| 0.25 | 15 min | 0:15 |
| 0.3 | 18 min | 0:18 |
| 0.4 | 24 min | 0:24 |
| 0.5 | 30 min | 0:30 |
| 0.6 | 36 min | 0:36 |
| 0.7 | 42 min | 0:42 |
| 0.75 | 45 min | 0:45 |
| 0.8 | 48 min | 0:48 |
| 0.9 | 54 min | 0:54 |
| 1.25 | 1 h 15 min | 1:15 |
| 1.5 | 1 h 30 min | 1:30 |
| 2.75 | 2 h 45 min | 2:45 |
| 3.33 | 3 h 20 min | 3:20 |
| 4.6 | 4 h 36 min | 4:36 |
| 7.5 | 7 h 30 min | 7:30 |
| 7.75 | 7 h 45 min | 7:45 |
| 8.25 | 8 h 15 min | 8:15 |
| 37.5 | 1 day 13 h 30 min | 37:30 |
| 38.75 | 1 day 14 h 45 min | 38:45 |
| 40.5 | 1 day 16 h 30 min | 40:30 |
Common Conversion Mistake
The most frequent error is reading clock time as a decimal. 7 hours 45 minutes is often typed as 7.45, but the correct value is 7.75. The difference is 18 minutes per entry. At $20 an hour, that is $6 per shift. Always convert minutes before entering hours into payroll.
Rounding Decimal Hours
Payroll usually rounds decimal hours to two places. One hundredth of an hour is 36 seconds, so a two place value is never more than 18 seconds off. Lawyers and consultants often bill in tenths of an hour, which are 6 minute units. Federal rule 29 CFR 785.48 also allows employers to round recorded work time to the nearest tenth of an hour if the rounding averages out fairly. Convert a full week’s total once at the end rather than rounding each day.
Decimal Hours in Excel and Google Sheets
Spreadsheets store time as a fraction of a day. To convert a time cell to decimal hours, multiply it by 24 and format the result as a number. If A2 holds 7:45, =A2*24 returns 7.75. To convert back, divide decimal hours by 24 and format the cell as time.
Frequently Asked Questions
What is a time to decimal calculator?
A time to decimal calculator is a tool that converts hours and minutes into decimal hours, such as 7 h 30 min into 7.5 hours. Most also convert decimal hours back into hours and minutes.
How do I convert minutes to decimal hours?
Divide the minutes by 60. For example, 40 minutes is 40 ÷ 60 = 0.67 hours, and 15 minutes is 0.25 hours.
How do I convert decimal hours to hours and minutes?
Keep the whole number as hours and multiply the decimal part by 60 for minutes. For example, 8.2 hours is 8 hours and 0.2 × 60 = 12 minutes.
What is 7 hours and 30 minutes in decimal?
7 hours and 30 minutes is 7.5 hours, because 30 minutes is half of an hour.
What is 0.75 hours in minutes?
0.75 hours is 45 minutes, because 0.75 × 60 = 45.
Why does payroll use decimal hours?
Pay is calculated by multiplying hours by a rate, and multiplication needs a base 10 number. Decimal hours, such as 8.25, can be multiplied directly by an hourly wage.
Is 6 minutes equal to 0.1 hours?
Yes. An hour has 60 minutes, so one tenth of an hour is exactly 6 minutes.