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Time · Calculator
Hours & Minutes Calculator
Add or subtract hours, minutes, and seconds. Accepts various input formats.
← All time calculatorsTotal Duration
10h 45m
10.75 decimal hours
38700 seconds
Hours
10
Minutes
45
Total Minutes
645
Decimal
10.75
Hours
Smart Insights
10h 45m (10.75 decimal hours).
This is 645 total minutes.
How It Works
Durations are parsed, converted to total seconds, and added or subtracted.
Frequently Asked Questions
What formats are accepted?
HMS (1h 30m), colon (2:30), word (150 minutes), decimal (1.5).
Can I mix formats?
Yes. Each duration can be in a different format.
What if the result is negative?
Subtracting a larger duration yields a negative result.
How accurate is this?
All calculations use total seconds internally.
What is decimal hours?
Decimal hours = total minutes ÷ 60.
Can I add more durations?
Multi-duration addition coming in a future update.
Last reviewed: July 20, 2026