How to add hours and minutes
- Add all the minutes together.
- Divide the minutes by 60: the whole part goes to the hours, the remainder stays as minutes.
- Add all the hours, plus the carried hours.
Minutes: 45 + 30 + 50 = 125 = 2 h 5 min
Hours: 2 + 3 + 1 + 2 = 8 → 8:05
Subtracting time
Subtract the minutes first and borrow an hour (60 minutes) if you need to: 8:05 − 2:45 → 7:65 − 2:45 = 5:20.
Adding up a week of work
Monday 7:45, Tuesday 8:20, Wednesday 8:00, Thursday 7:55, Friday 6:30 adds up to 38:30, or 38.5 decimal hours. If you have start and end times instead of hours, use the time card calculator.
Common additions
| Sum | Hours : minutes | Decimal |
|---|---|---|
| 0:45 + 0:30 | 1:15 | 1.25 |
| 1:30 + 0:45 | 2:15 | 2.25 |
| 7:45 + 8:00 | 15:45 | 15.75 |
| 7:30 + 7:30 + 7:30 + 7:30 + 7:30 | 37:30 | 37.50 |
| 8:20 + 8:15 + 8:30 + 8:00 + 7:45 | 40:50 | 40.83 |
Hours and minutes questions
How do you add hours and minutes?
Add the minutes together and the hours together. Every 60 minutes make one more hour. 1:45 + 2:30: 45 + 30 = 75 minutes = 1 hour 15 minutes; 1 + 2 + 1 = 4 hours; total 4:15.
How do you subtract hours and minutes?
Subtract the minutes first. If there are not enough, borrow one hour as 60 minutes. 5:10 − 2:45: 10 is less than 45, so 5:10 becomes 4:70; 70 − 45 = 25 minutes, 4 − 2 = 2 hours; the answer is 2:25.
How do I multiply hours and minutes by a number?
Convert to minutes, multiply, and convert back. 7:30 × 5 = 450 minutes × 5 = 2,250 minutes = 37 hours 30 minutes. Or use decimals: 7.5 × 5 = 37.5 hours. Open “Multiply or divide the total” to do it here.
Why does the total go over 24 hours?
This is a duration, not a time of day. 26:30 means 26 hours 30 minutes of work (1 day 2 hours 30 minutes), which is what a weekly total should show. A clock would wrap around to 2:30 AM.
How do I convert the total to decimal hours?
Divide the minutes by 60 and add them to the hours: 6:45 is 6 + 45 ÷ 60 = 6.75 hours. The calculator shows the decimal total next to the hours and minutes; the decimal hours calculator has a full minutes chart.