Decimal Hours Calculator
This Decimal Hours Calculator converts hours and minutes into decimal hours and back again — 8:15 becomes 8.25, the format payroll expects.
- Works both ways — 8:15 to 8.25, or 8.25 back to 8:15.
- Payroll rounding included — nearest quarter hour and nearest tenth, alongside the exact figure.
- Free, no signup — the maths runs in your browser, nothing is sent anywhere.
Calculation details
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The result updates as you type.
Common minutes
Common decimals
About the Decimal Hours Calculator
The Decimal Hours Calculator converts between the two ways of writing an amount of time: hours and minutes, like 8:15, and decimal hours, like 8.25. Payroll systems, invoices and timesheets almost always want the decimal form, while clocks and rosters use the other — and the gap between them causes a surprising amount of quiet, expensive error.
Why 8:15 is 8.25 and not 8.15
This is the mistake the whole page exists to prevent. Minutes run to 60, decimals run to 100. Fifteen minutes is a quarter of an hour, so it is 0.25 of an hour — not 0.15. Typing 8.15 into a payroll system instead of 8.25 short-changes six minutes on that shift. Repeat it across a team and a year and it becomes real money.
How to convert hours and minutes to decimal
8 hours 15 minutes → 8 + (15 ÷ 60) → 8 + 0.25 → 8.25
And to go back the other way, multiply the decimal part by 60:
8.25 → 0.25 × 60 → 15 → 8:15
The conversions that come up most
| Time | Decimal | Time | Decimal |
|---|---|---|---|
| 0:15 | 0.25 | 7:30 | 7.50 |
| 0:30 | 0.50 | 8:00 | 8.00 |
| 0:45 | 0.75 | 8:15 | 8.25 |
| 1:00 | 1.00 | 8:30 | 8.50 |
| 1:20 | 1.33 | 8:45 | 8.75 |
| 6:40 | 6.67 | 9:00 | 9.00 |
Minutes to decimal hours chart
Every minute from 1 to 60, rounded to two decimal places — the figure most payroll systems accept.
| Min | Dec | Min | Dec | Min | Dec | Min | Dec |
|---|---|---|---|---|---|---|---|
| 1 | 0.02 | 16 | 0.27 | 31 | 0.52 | 46 | 0.77 |
| 2 | 0.03 | 17 | 0.28 | 32 | 0.53 | 47 | 0.78 |
| 3 | 0.05 | 18 | 0.30 | 33 | 0.55 | 48 | 0.80 |
| 4 | 0.07 | 19 | 0.32 | 34 | 0.57 | 49 | 0.82 |
| 5 | 0.08 | 20 | 0.33 | 35 | 0.58 | 50 | 0.83 |
| 6 | 0.10 | 21 | 0.35 | 36 | 0.60 | 51 | 0.85 |
| 7 | 0.12 | 22 | 0.37 | 37 | 0.62 | 52 | 0.87 |
| 8 | 0.13 | 23 | 0.38 | 38 | 0.63 | 53 | 0.88 |
| 9 | 0.15 | 24 | 0.40 | 39 | 0.65 | 54 | 0.90 |
| 10 | 0.17 | 25 | 0.42 | 40 | 0.67 | 55 | 0.92 |
| 11 | 0.18 | 26 | 0.43 | 41 | 0.68 | 56 | 0.93 |
| 12 | 0.20 | 27 | 0.45 | 42 | 0.70 | 57 | 0.95 |
| 13 | 0.22 | 28 | 0.47 | 43 | 0.72 | 58 | 0.97 |
| 14 | 0.23 | 29 | 0.48 | 44 | 0.73 | 59 | 0.98 |
| 15 | 0.25 | 30 | 0.50 | 45 | 0.75 | 60 | 1.00 |
Rounding rules in payroll
Many employers do not pay to the exact minute. The two common conventions are quarter-hour rounding, where every entry snaps to the nearest 0.25, and tenth-hour rounding, snapping to the nearest 0.1 (six-minute blocks). Both figures are shown with every result above so you can match whichever your system uses.
Getting the hours in the first place
If you still need the length of the shift before converting it, work it out with the Time Difference Calculator — it gives you hours and minutes and the decimal figure together. For a period spanning several dates, use the Time Duration Calculator.
Frequently asked questions
What is 8 hours 15 minutes in decimal?
8.25 hours. Fifteen minutes is a quarter of an hour, so it becomes 0.25 — not 0.15.
How do I convert minutes to decimal hours?
Divide the minutes by 60. So 20 minutes is 20 ÷ 60 = 0.33 hours, and 45 minutes is 0.75 hours. The chart above lists every minute from 1 to 60.
How do I turn decimal hours back into hours and minutes?
Multiply the part after the decimal point by 60. In 7.75, the 0.75 × 60 = 45, so 7.75 hours is 7 hours 45 minutes. Switch this calculator to “Decimal → Time” to do it automatically.
What is 1.5 hours in hours and minutes?
1 hour 30 minutes. Similarly 2.25 hours is 2 hours 15 minutes, and 0.75 hours is 45 minutes.
Why does my payroll total differ by a few minutes?
Usually rounding. If your employer rounds to the nearest quarter hour, 8:10 is paid as 8.25 and 8:07 as 8.00. The result above shows the exact figure next to both rounded versions so you can see which was applied.
Is my data stored?
No. Everything runs locally in your browser. Nothing you type is sent to a server, and no account is required.