How to Add Hours and Minutes Without Mistakes
Add the minutes first, carry every 60 minutes into one hour, then add the hours. 8h 30m + 7h 45m: 30 + 45 = 75 minutes = 1h 15m, and 8 + 7 + 1 = 16, so the total is 16h 15m.
Why a normal calculator gets it wrong
Typing 8.30 + 7.45 gives 15.75, because a calculator counts in tens and hundreds. Minutes count in sixties. Writing times as 8:30 and adding by hand often leads to 15:75 or 8:90, which are not real times.
Step by step
- Line up hours and minutes in two columns.
- Add the minutes column.
- Divide the minutes by 60: the whole number is extra hours, the remainder stays as minutes.
- Add the hours column plus the extra hours.
Subtracting
If the minutes would go negative, borrow one hour as 60 minutes: 9h 10m − 2h 45m = 8h 70m − 2h 45m = 6h 25m.
Examples
- Week of shifts: 8h + 8h 30m + 7h 45m + 9h 15m + 6h 50m = 40h 20m
- Playlist: 3m 45s + 4m 12s + 5m 3s = 13m
- Overtime: 47h 30m − 40h = 7h 30m
Do it in the app
In Tickulo, type a number and tap h, m or s. Each value becomes a colored chip, the total updates as you type and shows hours, decimal hours and total minutes. Multiply and divide work too, including time ÷ time.
FAQ
Why does my calculator say 8h 30m + 7h 45m = 15.75?
A normal calculator treats 8.30 and 7.45 as decimals. Minutes are base 60, so the answer is 16h 15m (16.25 hours).
How do I add many times quickly?
Add all hours, add all minutes, then turn the minutes into hours and minutes: 3h + 2h + 4h = 9h, 45 + 50 + 20 = 115m = 1h 55m, total 10h 55m.
Can I add seconds too, for songs or videos?
Yes. 3m 45s + 4m 12s + 5m 3s = 13m 0s. Tickulo has day, hour, minute and second keys.