Time Duration Calculator
Elapsed time between two date-times in hours, minutes and days.
Quick answer
- Formula: Duration = end date-time − start date-time, reported in total minutes, total hours and a days/hours/minutes split
- Worked example — Total hours: 51.50 (full example below).
Time Duration Calculator
| Total hours | 51.50 |
| Total minutes | 3,090 |
| Duration breakdown | 2 days, 3 hours, 30 minutes |
From 9:00 AM on January 10 to 12:30 PM on January 12, 2026 is 51.5 hours — 3,090 minutes, or 2 days, 3 hours and 30 minutes.
Measure the exact elapsed time between a start date-and-time and an end date-and-time: total hours, total minutes, and a readable days/hours/minutes breakdown.
Handy for flight and travel spans, project elapsed time, equipment run time and billing periods that cross midnight or span several days.
The formula
Worked example
From 9:00 AM on January 10 to 12:30 PM on January 12, 2026 is 51.5 hours — 3,090 minutes, or 2 days, 3 hours and 30 minutes.
The example is pre-loaded in the result panel — press Calculate with your own numbers to replace it.
Frequently asked questions
Does it handle durations under a day?
Yes — the days figure is simply 0 and the totals show the exact hours and minutes between the two times.
Are time zones involved?
No. Both date-times are treated as readings on the same clock. To compare times in different zones, convert one with the Time Zone Converter first.
Category: Date & Time calculators
Sources & methodology
This calculator applies the formula shown on this page exactly as written, using the standard definitions for its inputs. Results are computed from the values you enter — no data is stored — and are rounded only for display.
Content last reviewed by CalcHub Editorial.
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