Time Half Calculator

One 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.
Split mode: 2 halves the duration, 3 gives thirds, and so on.
Accepts 09:00, 9:00 am or 09:00:30.
Give both dates for spans longer than a day.
Duration in hours
0.5000 h
Time Duration Calculator
Duration in minutes
30.00 min
Duration in seconds
1,800 s
Whole days
0 d
Hours part
0 h
Minutes part
30 min
Seconds part
0 s
Duration as h:mm
0:30
Duration as h:mm:ss
0:30:00
Duration in words
30 minutes
Hours after the break
0.5000 h
Break deducted
0 min
Resulting time (24 h)
09:30:00
Resulting time (12 h)
9:30 AM
Days rolled over
0 d
Crosses midnight
no
Durations in the list
1
Average duration
1.0000 h
Duration before splitting or rescaling
1.0000 h
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
  1. 1:00:00 split into 2 equal part(s) = 0:30:00 each.
  2. 30 minutes total = 0.5 hours (60 s = 1 min, 60 min = 1 h).
Each durationtable
indexclockminuteshours
11:00:00601

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