General Calculators
Time Calculator
Add or subtract hours, minutes and seconds, and calculate elapsed time across midnight.
Calculator
Enter your values and calculate.
Result
Results appear here.
Formula
Turn each clock time into minutes from midnight: hours × 60 + minutes.
Elapsed time = later minutes − earlier minutes. If the result is negative, the end time is on the next day, so add 24 × 60 minutes before subtracting.
Convert back: whole hours = minutes ÷ 60, and the remainder is the minutes.
Solved example (school day)
Assembly is 8:15 and the last bell is 13:30.
8:15 is 8 × 60 + 15 = 495 minutes. 13:30 is 13 × 60 + 30 = 810 minutes.
810 − 495 = 315 minutes.
315 ÷ 60 = 5 hours, with 15 minutes left. The day in between is 5 hours 15 minutes.
Frequently asked questions
How long is the gap from 8:15 to 13:30?
315 minutes, which is 5 hours and 15 minutes. Both times are on the same day.
What if the end time looks earlier than the start?
The calculator treats that as crossing midnight. A shift from 22:00 to 06:00 is 8 hours, not a negative time.
Is this the same as the date difference calculator?
No. This page works in hours and minutes on a clock. The date difference calculator counts calendar days between two dates.
Does 13:30 mean 1:30 pm?
Yes. The 24-hour form 13:30 is 1:30 in the afternoon. 8:15 is 8:15 in the morning.