Time Duration Calculator
Find the exact duration between a start and end moment. Enter both dates and times (24-hour clock) to get total hours:minutes, decimal hours and total minutes; if the end is earlier than the start, the tool assumes it crosses midnight into the next day and says so.
TheCalculators — Time Duration Calculator
Printed thecalculators.com
Total Duration
8h 30m
09:00 → 17:30
- Start
- 2026-11-08 09:00
- End
- 2026-11-08 17:30
- Hours : Minutes
- 8h 30m
- Decimal Hours
- 8.50
- Total Minutes
- 510
- Total Seconds
- 30,600
- Days (decimal)
- 0.354
- Crossed Midnight
- No
How the duration is found
- 1Convert both to minutes2026-11-08 09:00 → 540 min · 2026-11-08 17:30 → 1,050 min
- 2Subtract1,050 − 540 = 510 minutes
- 3Convert back510 min = 8h 30m = 8.50 decimal hours
Duration in every unit
If the end moment is earlier than the start, this tool assumes the interval crosses midnight into the next day. For multi-day spans, set the correct end date instead.
Most useful next
Formula
duration = (end date-time − start date-time), +24 h if end < start · decimal hours = total minutes ÷ 60
Pro tips
- • Payroll systems usually want decimal hours — 8h 30m is 8.5, not 8.30.
- • Check both dates when spanning weekends; same-day defaults silently cap at 24 h.
FAQ
Related Calculators
More Everyday tools you might need.
Age Calculator
Calculate exact age in years, months, days — plus weeks, hours, minutes and next birthday.
CalculateDate Calculator
Days between two dates, or add/subtract years, months, weeks and days — with business-day mode.
CalculateHours Calculator
Find hours and minutes between a start and end time, minus breaks — with optional pay.
CalculateTime Card Calculator
Weekly time card: daily hours, overtime over 40 and gross pay with 1.5× OT.
Calculate