Time to decimal calculator
A time to decimal calculator converts hours, minutes and seconds into decimal hours. Divide minutes by 60 and seconds by 3,600, then add the whole hours. For example, 7 hours 30 minutes equals 7.5 hours, not 7.30. Use the converter below in either direction.
Both directions
Time to decimal, or decimal back to hours and minutes
2, 4 or 6 places
Choose the precision your timesheet or invoice needs
Whole seconds
The underlying duration is never rounded away
Use the time to decimal calculator
Choose a direction, enter the values and copy the result. The result updates as you type and nothing is saved.
Result
Enter a time or a decimal to see the conversion. Nothing is calculated until you do.
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- Decimal hours
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- Hours, minutes and seconds
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- Total minutes
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The decimal did not map to a whole number of seconds, so the time shown is rounded to the nearest second.
Calculated in your browser. Your entries are not sent to a server or written to the page address. Consented analytics record only that a conversion happened, never the values.
Hours to decimal
How to convert time to decimal hours
Formula
Decimal hours = hours + minutes ÷ 60 + seconds ÷ 3,600. Minutes are sixtieths of an hour, so 30 minutes is 0.5 hours and 6 minutes is 0.1 hours. The decimal point does not separate hours from minutes.
7 h 30 m → 7 + 30 ÷ 60 = 7.50 hours
2 h 45 m 45 s → 2 + 45 ÷ 60 + 45 ÷ 3,600 = 2.7625 hoursWorked billing example
ExampleA session of 7 hours 59 minutes at 100.00 per hour is 7 + 59 ÷ 60 = 7.9833 hours, which bills 798.33. Rounding the time up to 8 hours before multiplying would bill 800.00 and overstate the invoice by 1.67. Keep the duration, multiply, then round the money once.
Reference
Minutes-to-decimal conversion chart
Every minute from 1 to 60 as a fraction of an hour, shown at two and four decimal places. Two places is common on timesheets; four places avoids drift when a rate is applied.
| Minutes | 2 dp | 4 dp |
|---|---|---|
| 1 | 0.02 | 0.0167 |
| 2 | 0.03 | 0.0333 |
| 3 | 0.05 | 0.0500 |
| 4 | 0.07 | 0.0667 |
| 5 | 0.08 | 0.0833 |
| 6 | 0.10 | 0.1000 |
| 7 | 0.12 | 0.1167 |
| 8 | 0.13 | 0.1333 |
| 9 | 0.15 | 0.1500 |
| 10 | 0.17 | 0.1667 |
| 11 | 0.18 | 0.1833 |
| 12 | 0.20 | 0.2000 |
| 13 | 0.22 | 0.2167 |
| 14 | 0.23 | 0.2333 |
| 15 | 0.25 | 0.2500 |
| 16 | 0.27 | 0.2667 |
| 17 | 0.28 | 0.2833 |
| 18 | 0.30 | 0.3000 |
| 19 | 0.32 | 0.3167 |
| 20 | 0.33 | 0.3333 |
| Minutes | 2 dp | 4 dp |
|---|---|---|
| 21 | 0.35 | 0.3500 |
| 22 | 0.37 | 0.3667 |
| 23 | 0.38 | 0.3833 |
| 24 | 0.40 | 0.4000 |
| 25 | 0.42 | 0.4167 |
| 26 | 0.43 | 0.4333 |
| 27 | 0.45 | 0.4500 |
| 28 | 0.47 | 0.4667 |
| 29 | 0.48 | 0.4833 |
| 30 | 0.50 | 0.5000 |
| 31 | 0.52 | 0.5167 |
| 32 | 0.53 | 0.5333 |
| 33 | 0.55 | 0.5500 |
| 34 | 0.57 | 0.5667 |
| 35 | 0.58 | 0.5833 |
| 36 | 0.60 | 0.6000 |
| 37 | 0.62 | 0.6167 |
| 38 | 0.63 | 0.6333 |
| 39 | 0.65 | 0.6500 |
| 40 | 0.67 | 0.6667 |
| Minutes | 2 dp | 4 dp |
|---|---|---|
| 41 | 0.68 | 0.6833 |
| 42 | 0.70 | 0.7000 |
| 43 | 0.72 | 0.7167 |
| 44 | 0.73 | 0.7333 |
| 45 | 0.75 | 0.7500 |
| 46 | 0.77 | 0.7667 |
| 47 | 0.78 | 0.7833 |
| 48 | 0.80 | 0.8000 |
| 49 | 0.82 | 0.8167 |
| 50 | 0.83 | 0.8333 |
| 51 | 0.85 | 0.8500 |
| 52 | 0.87 | 0.8667 |
| 53 | 0.88 | 0.8833 |
| 54 | 0.90 | 0.9000 |
| 55 | 0.92 | 0.9167 |
| 56 | 0.93 | 0.9333 |
| 57 | 0.95 | 0.9500 |
| 58 | 0.97 | 0.9667 |
| 59 | 0.98 | 0.9833 |
| 60 | 1.00 | 1.0000 |
Accuracy
Precision and rounding
The calculator keeps every duration in whole seconds and only rounds when it displays a decimal. Choosing two, four or six decimal places changes what you see and copy, not the underlying time. Twenty minutes is 0.33 at two places and 0.3333 at four; both come from the same 1,200 seconds.
Converting decimal hours back to time can land between two seconds. In that case the reverse mode rounds to the nearest second and tells you it has done so. One millionth of an hour is 0.0036 seconds, so the difference never reaches a displayed minute.
For billing, multiply your rate by the unrounded duration and round the money once at the end. Rounding 7 hours 59 minutes up to 8 hours before applying a rate changes what the client pays; showing 7.98 on the invoice while billing from 7 hours 59 minutes does not.
Frequently asked questions
Time to decimal questions
Is 7:30 the same as 7.3 hours?
No. 7:30 means seven hours and thirty minutes, which is 7.5 decimal hours. A value of 7.3 hours means seven hours and eighteen minutes.
How do I convert minutes to decimal hours?
Divide the number of minutes by 60. Fifteen minutes is 0.25 hours, and forty-five minutes is 0.75 hours.
Can I convert decimal hours back to hours and minutes?
Yes. Keep the whole hours and multiply the fractional part by 60. The reverse mode also shows seconds when needed.
Should I round time before calculating an invoice?
Preserve the underlying duration and calculate from it. Round the final money amount under your agreed billing policy; a rounded display is not the same as changing recorded time.
Can I enter more than 24 hours?
Yes. This is a duration converter, not a clock. Enter the total hours without rolling over at midnight.
Are my entries saved?
The calculator works in your browser without an account. Entries are not saved by default; copying a result puts the selected summary on your clipboard.
Related tools
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Next step
Put your hours to work
Converting one total is useful. Tracking work as it happens can make the next invoice easier, and the same hours can flow straight into an invoice or a rate plan.