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Time calculator

Time

HH:MM arithmetic and duration totals. Handy for logs and schedules.

Runs in your browser. Numbers stay on this device — nothing is uploaded to BrowserSpaces for processing.

Add / subtract

Combine durations.

Totals

Minutes and seconds.

Normalize

Overflow minutes become hours.

Use the calculator

Result

2h 15m 15s

How it works

How time math works

Everything converts to minutes (or seconds), then formats back to H:MM.

Three steps

  1. 1

    Enter times

    Hours and minutes.

  2. 2

    Pick operation

    Add or subtract.

  3. 3

    Read duration

    Normalized result.