Free time to decimal calculator
Turn any clock time into decimal hours for payroll, billing, or a timesheet. Enter hours, minutes, and seconds and the converter returns the decimal hours (7:45 → 7.75), decimal minutes, and total seconds — or flip the direction to turn decimal hours back into h:mm:ss — plus the full 00–59 minutes-to-decimal chart, updated live, as you type.
On this page15 sections
| Minutes | Decimal |
|---|---|
| 00 | .00 |
| 06 | .10 |
| 10 | .17 |
| 15 | .25 |
| 20 | .33 |
| 30 | .50 |
| 40 | .67 |
| 45 | .75 |
| 50 | .83 |
| 59 | .98 |
Converts clock time and decimal hours. Why decimal hours matter for payroll
Results are estimates. Consult a professional.
What are decimal hours?
Decimal hours express a length of time as a single base-10 number instead of separate hours, minutes, and seconds. Two hours and thirty minutes becomes 2.5 hours; one hour and fifteen minutes becomes 1.25 hours. The minutes are converted into a fraction of an hour — thirty minutes is half an hour, so .5 — rather than kept as a separate 00–59 count. That single number is what payroll software, billing systems, and timesheets expect, because it can be multiplied straight against an hourly rate. This time to decimal calculator does that conversion the moment you enter a time.
The crucial thing to grasp is that 7:45 is not 7.45 in decimal. The colon time 7 hours 45 minutes converts to 7.75 decimal hours, because 45 minutes is three-quarters of an hour, not forty-five hundredths. Confusing the two is the single most common — and most expensive — mistake in timesheet math, and it is exactly what a converter removes.
How to convert time to decimal hours
Converting a clock time to decimal hours takes one division and one addition. The calculator above does it live, but here is the arithmetic it runs so you can check it by hand.
- Keep the whole hours as they are. 8 hours stays 8.
- Divide the minutes by 60. Minutes are a fraction of an hour, and there are 60 minutes in an hour, so 45 ÷ 60 = 0.75. (If you have seconds too, divide them by 3,600 and add them in.)
- Add the pieces together. 8 + 0.75 = 8.75 decimal hours. That is the number you multiply by an hourly rate.
Why decimal hours matter for payroll
The reason decimal hours exist is wages. To pay someone, you multiply the hours they worked by their hourly rate — and you cannot multiply 8 hours 45 minutes by $20 directly. You first convert the time to 8.75 hours, then 8.75 × $20 = $175. Every payroll system, from a spreadsheet to ADP, runs on decimal hours for this reason; the colon format is for reading clocks, the decimal format is for math.
An employee works 8:45 (8 hours 45 minutes) at $20/hour. Multiply the clock time naively as 8.45 × $20 and you get $169 — short by $6 a day. Convert properly to 8.75 decimal hours and 8.75 × $20 = $175. Across a five-day week that error is $30; across a year of staff, it is a payroll the books never reconcile.
A worked example using the time to decimal calculator
Dana logs a shift of 7 hours, 20 minutes, and 30 seconds and needs the decimal hours to drop into the payroll sheet. Here is the arithmetic the calculator runs.
Step 1 — Keep the whole hours
The 7 whole hours carry across unchanged. The decimal answer will start with 7 and the conversion only adds the minutes-and-seconds fraction on top.
Step 2 — Turn the minutes into a fraction of an hour
Divide the minutes by 60: 20 ÷ 60 = 0.3333. Twenty minutes is one-third of an hour.
Step 3 — Add the seconds, divided by 3,600
Seconds are a fraction of an hour too — there are 3,600 of them in an hour: 30 ÷ 3600 = 0.0083. Add it on.
Step 4 — Sum the pieces
7 + 0.3333 + 0.0083 = 7.3417 decimal hours, which payroll usually rounds to 7.34.
Minutes to decimal conversion chart (00–59)
Most timesheet conversions only need the minutes column. The chart below lists every minute from 00 to 59 beside its decimal-hour equivalent, rounded to two places — the reference payroll teams pin to the wall. Read across: 15 minutes is .25, 30 is .50, 45 is .75. The columns run in three pairs so the whole hour fits on one screen.
| Min | Dec | Min | Dec | Min | Dec |
|---|---|---|---|---|---|
| 00 | .00 | 20 | .33 | 40 | .67 |
| 01 | .02 | 21 | .35 | 41 | .68 |
| 02 | .03 | 22 | .37 | 42 | .70 |
| 03 | .05 | 23 | .38 | 43 | .72 |
| 04 | .07 | 24 | .40 | 44 | .73 |
| 05 | .08 | 25 | .42 | 45 | .75 |
| 06 | .10 | 26 | .43 | 46 | .77 |
| 07 | .12 | 27 | .45 | 47 | .78 |
| 08 | .13 | 28 | .47 | 48 | .80 |
| 09 | .15 | 29 | .48 | 49 | .82 |
| 10 | .17 | 30 | .50 | 50 | .83 |
| 11 | .18 | 31 | .52 | 51 | .85 |
| 12 | .20 | 32 | .53 | 52 | .87 |
| 13 | .22 | 33 | .55 | 53 | .88 |
| 14 | .23 | 34 | .57 | 54 | .90 |
| 15 | .25 | 35 | .58 | 55 | .92 |
| 16 | .27 | 36 | .60 | 56 | .93 |
| 17 | .28 | 37 | .62 | 57 | .95 |
| 18 | .30 | 38 | .63 | 58 | .97 |
| 19 | .32 | 39 | .65 | 59 | .98 |
Minutes → decimal hours (minutes ÷ 60), rounded to two decimals. Add this to the whole hours: 8 h 27 m = 8 + .45 = 8.45 decimal hours.
Quarter-hour conversions: 15, 30, and 45 minutes
Four conversions cover most timesheets because so many shifts and breaks land on the quarter-hour. They are worth memorising so you rarely need the full chart:
| Minutes | Fraction of an hour | Decimal |
|---|---|---|
| 0 minutes | on the hour | .00 |
| 15 minutes | quarter hour | .25 |
| 30 minutes | half hour | .50 |
| 45 minutes | three-quarter hour | .75 |
The quarter-hour anchors. Everything else falls between them — 20 minutes (.33) sits between .25 and .50.
Convert decimal hours back to time (hh:mm:ss)
The conversion runs both ways. To turn decimal hours back into a clock time — say a timesheet reads 6.75 hours and you want to know what that is in hours and minutes — you reverse the steps: the whole-number part is the hours, and you multiply the decimal part by 60 to get the minutes. Switch the calculator's direction and it does this for you.
- Split off the whole hours. In 6.75, the 6 is the hours.
- Multiply the decimal part by 60 for the minutes. 0.75 × 60 = 45 minutes.
- If any fraction is left, multiply that by 60 for the seconds. A clean .75 leaves none, so 6.75 hours is 6:45:00.
Rounding rules for timesheets
Decimal hours from minutes often carry a repeating fraction — 20 minutes is 0.3333…, 10 minutes is 0.1666…. Payroll has to decide how far to round, and there are two common conventions.
- Round the decimal to two places. The simplest approach: 0.3333 becomes 0.33, 0.1666 becomes 0.17. This is what most payroll software does, and what the chart above uses.
- Round the time to the nearest quarter-hour first. US federal wage law (the FLSA) lets employers round clock-in/out times to the nearest 15 minutes, using the '7-minute rule': 1–7 minutes past round down, 8–14 round up. So 8:07 rounds to 8:00, 8:08 rounds to 8:15. The rounded time is then converted to a clean .00/.25/.50/.75 decimal.
Common time-to-decimal mistakes
- Reading the minutes as the decimal. 7:30 is 7.5, not 7.30. The colon separates hours and minutes; the decimal point separates hours and fractions of an hour.
- Dividing by 100 instead of 60. Minutes are sixtieths of an hour, so always divide by 60. 45 ÷ 60 = 0.75, not 45 ÷ 100 = 0.45.
- Forgetting seconds when precision matters. For billing in tenths of an hour, seconds rarely matter; for scientific or exact logs they do — divide them by 3,600.
- Multiplying the clock time by the wage. 8:45 × $20 is meaningless. Convert to 8.75 first, then multiply.
- Rounding too early. If you round each day's minutes and then sum, the errors stack. Sum first, round once.
Sources and methodology
Conversions use the standard time identity: decimal hours = hours + minutes/60 + seconds/3600, with the reverse splitting a decimal back into hours, minutes, and seconds. The quarter-hour timesheet rounding convention (the '7-minute rule') follows the US Fair Labor Standards Act (FLSA) regulations on rounding employee work time. Every figure in this tool is computed exactly from the hours, minutes, and seconds you enter — no clock, date, or timezone is read from your device.
US Department of Labor — FLSA Hours Worked (29 CFR §785.48, rounding practices).Frequently asked questions about the free time to decimal calculator
About this time to decimal calculator
This time to decimal calculator runs entirely in your browser. The time you type never leaves your device — nothing is sent to a server, logged, or shared. It applies the standard identity (decimal hours = hours + minutes/60 + seconds/3600), works in both directions, and updates instantly on every change. No clock, date, or timezone is read from your device.
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