Hours & Time Calculator

What to calculate

DurationsOne duration per line, or separated by commas. Write 1:23:45 for hours:minutes:seconds, 90m or 1.5h for a single unit, or 1h 30m for a mixture. A two-part "3:45" is read using the setting below.

A two-part duration like 3:45 means

Number of equal partsSplit mode: 2 halves the duration, 3 gives thirds, and so on.

Playback speedSpeed mode: 1.5 plays at one and a half times, 0.5 at half speed.

Start timeAccepts 09:00, 9:00 am or 09:00:30.

End timeUsed when calculating the time between two times.

Start date (optional)Give both dates for spans longer than a day.

End date (optional)

Treat an earlier end time as the next day

Unpaid break (min)

Days to add or subtract

Hours to add or subtract

Minutes to add or subtract

Seconds to add or subtract

Duration in hours

8.0000 h

Time Duration Calculator

Duration in minutes

480.00 min

Duration in seconds

28,800 s

Whole days

0 d

Hours part

8 h

Minutes part

0 min

Seconds part

0 s

Duration as h:mm

8:00

Duration as h:mm:ss

8:00:00

Duration in words

8 hours

Hours after the break

8.0000 h

Break deducted

0 min

Resulting time (24 h)

17:00:00

Resulting time (12 h)

5:00 PM

Days rolled over

0 d

Crosses midnight

Worked out from ISO 8601-1:2019, Date and time - Representations for information interchange, clauses 5.3 and 5.5 and 2 other sources.

How this is worked out

2 steps

Elapsed = 17:00:00 - 09:00:00 = 8:00:00.
480 minutes total = 8 hours (60 s = 1 min, 60 min = 1 h).

Results are general information, not financial, tax, legal, medical or engineering advice.