Time Calculator
Add or subtract time durations and convert between hours, minutes, and seconds.
First Duration
Hours
Mins
Secs
Second Duration
Hours
Mins
Secs
Sum
4h 15m 0s
15,300
Total Seconds
255.00
Total Minutes
4.2500
Total Hours
About Time Calculator
Adding time durations
When adding times, seconds overflow into minutes (60s = 1m) and minutes overflow into hours (60m = 1h). This calculator handles all overflow automatically.
Common time conversions
1 hour = 60 minutes = 3,600 seconds
1 day = 24 hours = 1,440 minutes = 86,400 seconds
1 week = 7 days = 168 hours = 604,800 seconds
Useful for
Calculating total hours worked in a week
Adding up cooking or study session durations
Converting media file lengths between units
Project time tracking and billing
🔒 All calculations happen in your browser — no data is sent to any server. Results are for informational purposes only.