Hours and Minutes Calculator
Add and subtract a list of durations in h:mm, “2h 15m”, minutes or decimal hours, with totals in h:mm and decimal.
Your inputs
Results
Total
4:45
- Decimal hours
- 4.75
- Total minutes
- 285
- As days, hours, minutes
- 0 d 4 h 45 min
✓Exact calculation — rounded only for display
What this calculator does
Totalling time across tasks, flights or workouts is easier when the tool accepts any common format.
Formula and method
Total minutes = Σ durations (negative entries subtract); shown as h:mm and decimal hours
Worked example
Calculated by this tool with its default inputs:
Inputs
- Durations (h:mm, 2h 15m, 45m, or decimal hours; prefix − to subtract): 1:30 2:45 0:50 -0:20
Results
- Total: 4:45
- Decimal hours: 4.75
- Total minutes: 285
- As days, hours, minutes: 0 d 4 h 45 min
How to read the results
Decimal hours are convenient for billing and payroll.
Assumptions and limitations
- Prefix an entry with − to subtract it.
Questions
Is 1.5 hours 1:50?
No — 1.5 hours is 1:30.
Methodology and verification
- Result type
- Exact mathematical calculation (rounded only for display)
- Formula version
- 1.0
- Automated verification
- 3 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
- Editorial review
- Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.
Privacy
Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Inputs are added to a share link only if you choose to include them. Privacy policy