Hours calculator
Find the difference between two times, or add and subtract hours and minutes from a clock time.
Mode
From (HH:MM)
To (HH:MM)
Result
8h 15min
How to use
1. Choose diff, add, or subtract mode.
2. Enter times or durations.
3. Read result as hours and minutes.
Example
Hours calculator
Find the difference between two times, or add and subtract hours and minutes from a clock time.
When to use
• When you need a quick estimate without spreadsheets.
• When you want privacy — calculations stay on your device.
Limitations
• When you need certified engineering or legal calculations.
• When site-specific conditions require a professional survey.
About this calculator
Find the difference between two times, or add and subtract hours and minutes from a clock time.
Frequently asked questions
Is my data uploaded?
No. All math runs locally in your browser.
Is this tool free?
Yes. No account or subscription required.