Hours and minutes to decimal hours
An invoice multiplies hours by a rate, so 1:45 has to become 1.75. Paste your times, one per line, and get each as a decimal with the total.
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Total, in decimal hours
5.83 h
- 1:30
- 1.5 h
- 0:45
- 0.75 h
- 2:15
- 2.25 h
- 1h 20m
- 1.33 h
How the conversion works
Decimal hours are the hours plus the minutes divided by 60. So 1:45 is 1 + 45 ÷ 60, which is 1.75. Seconds, if a time has them, are divided by 3,600. The answer is shown to two decimal places, which is as fine as an invoice needs.
Minutes to decimal hours
| Minutes | Decimal hours |
|---|---|
| 5 | 0.08 |
| 10 | 0.17 |
| 15 | 0.25 |
| 20 | 0.33 |
| 25 | 0.42 |
| 30 | 0.50 |
| 35 | 0.58 |
| 40 | 0.67 |
| 45 | 0.75 |
| 50 | 0.83 |
| 55 | 0.92 |
| 60 | 1.00 |
Rounding
Rounding is applied to each line before the lines are added, which is how it works on an invoice: each piece of work is rounded, then the lines are totaled. “Up to the next 15 minutes” always rounds up; the other two choices round to whichever mark is nearer.
From here to an invoice
Each decimal goes on its own invoice line with a date and a sentence about the work. The free invoice generator lays the lines out and multiplies them by your rate, and this guide covers the steps between a timesheet and a finished invoice.
Questions
How do I convert minutes to decimal hours?
Divide the minutes by 60. Fifteen minutes is 0.25, 30 minutes is 0.5 and 45 minutes is 0.75. For hours and minutes, keep the hours and convert only the minutes: 2 hours 45 minutes is 2.75 hours.
What is 1 hour 45 minutes as a decimal?
1.75 hours. Forty-five minutes is 45 ÷ 60, which is 0.75, added to the one hour.
Why do invoices use decimal hours?
Because hours are multiplied by a rate. 1:45 at $60 an hour can’t be multiplied as written; 1.75 × 60 gives $105.
Should I round my time to the nearest quarter hour?
Quarter hours are the common choice for freelance work, and tenths of an hour (six minutes) are usual in law and accounting. Use whichever your agreement says, and round every piece of work the same way.
The numbers are the easy part. Sandglass writes the invoice lines from your notes.
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