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Time Calculator

Add, subtract, and convert time values, and find the exact duration between two times.

Running Total

00:00:00

Free Time Calculator

Need to add up several time entries, find how long a shift or meeting lasted, or convert between time units? Our free Time Calculator handles all three — add or subtract multiple time values, calculate the exact duration between two times (even across midnight), and convert between hours, minutes, seconds, and days.

How to Use This Tool

Add / Subtract Time: Enter each time value in hours, minutes, and seconds, choose add or subtract, and see the running total.

Duration Between Times: Enter a start and end time (check the box if the end time is the next day) and calculate the exact duration.

Convert Time: Enter a value and its unit to instantly see the equivalent in seconds, minutes, hours, and days.

Common Use Cases

  • Adding up hours worked across multiple shifts or timesheets.
  • Calculating how long a meeting, event, or workout lasted.
  • Converting a video or audio duration between units.
  • Working out overnight shift durations that cross midnight.

Privacy & Security

All calculations happen locally in your browser. Your data is never uploaded to a server.

Frequently Asked Questions

How do I add or subtract time values? +
Use the "Add / Subtract Time" tab and enter each value with hours, minutes, and seconds.
Use the "Duration Between Times" tab and enter a start and end time.
Yes, use the "Convert Time" tab.
Yes, both add/subtract and duration calculations handle totals beyond 24 hours.
Yes, completely free with unlimited use.
No, all calculations happen locally in your browser.

Related Tools

Also try our Date Calculator, Age Calculator, and Age Difference Calculator.

Ready to calculate? Choose a tab above — free and instant.

Share Your Experience

Found this tool useful? Have a suggestion or found a bug? Send your feedback directly to us — we read every message.