How to use
- Enter the start time and end time.
- Optional: add an unpaid break in minutes.
- For a span longer than a day, choose Yes, add dates and pick both dates.
- Read the result in hours and minutes, decimal hours and total minutes.
How hours are calculated
- Same day: end time − start time.
- Overnight: if the end is earlier than the start, it falls on the next day, so 24 hours are added.
- With dates: the whole days between the dates × 24 hours, plus the clock difference.
- Break: subtracted from the total.
- Decimal hours: minutes ÷ 60.
Examples
- 9:00 to 17:30: 8 hours 30 minutes = 8.50 hours (510 minutes).
- 22:00 to 06:00: overnight, so 06:00 + 24:00 − 22:00 = 8 hours.
- 8:30 to 17:30 with a 60-minute lunch: 9 hours − 1 hour = 8 hours.
- 20:00 on 21 October to 06:00 on 23 October: 34 hours.
Minutes to decimal hours
| Minutes | Decimal hours |
|---|---|
| 5 | 0.08 |
| 6 | 0.10 |
| 10 | 0.17 |
| 15 | 0.25 |
| 20 | 0.33 |
| 30 | 0.50 |
| 40 | 0.67 |
| 45 | 0.75 |
| 50 | 0.83 |
Decimals are rounded to 2 places. For example, 10 minutes is exactly 0.1666… hours.
Daylight saving nights and 24-hour shifts
The calculator works with clock times, not time zones. On the night clocks go forward, a shift really lasts one hour less than the clock difference. When they go back, it lasts one hour more.
If the start and end times are the same, the result is 0. For a 24-hour shift, add dates and set the end date to the next day.
Need a weekly total? The time card calculator adds up a whole week, with overtime and pay.