Time calculator: add and subtract hours, minutes, seconds
Add or subtract any number of times in hours, minutes and seconds, multiply or divide a total, and get the result in h:mm:ss, decimal hours and minutes.
Input
How to use this tool
- Enter your values or choose a local file. Replace the example data with your own.
- Review options, units and assumptions, then run the tool.
- Check the result before copying or downloading it. Keep an original copy of important files.
Method & assumptions
Add or subtract any number of times in hours, minutes and seconds, multiply or divide a total, and get the result in h:mm:ss, decimal hours and minutes.
total = Σ(± hours × 3600 + minutes × 60 + seconds)Worked example
Times, one per line (start a line with − to subtract, × or ÷ to multiply or divide): 2:45:30 1h 20m + 45 min − 0:15 Plain numbers are: Minutes → Total (hours:minutes:seconds): 4:35:30 → Total in days, hours and minutes: 4 h 35 min 30 s → Decimal hours: 4.5917 → Total minutes: 275.5 → Total seconds: 16,530
Limits & important notes
Accepted formats: 1:30 (hours:minutes), 1:30:15, 2h 30m, 1.5h, 90 min, 45s, 1d 4h and plain numbers. Each line shows the running total so you can check it.
Content updated:
Frequently asked questions
How do I add hours and minutes?
Put each time on its own line, such as 1:45 and 2:30, then press Run. The calculator converts everything to seconds, adds them and shows 4:15:00, which is 4 hours 15 minutes or 4.25 decimal hours.
How do I convert minutes to decimal hours?
Divide the minutes by 60. For example, 7 hours 45 minutes is 7 + 45 ÷ 60 = 7.75 hours. The result panel shows decimal hours for any total.
Privacy & Free to use
Are my inputs stored?
Your inputs stay in this tab. We do not receive your files, pasted text or calculation values.
Is this tool free?
Yes. No signup or payment is required.
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