SMPTE timecode calculator

Convert non-drop-frame timecode to a frame count and add or subtract frames.

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Timecode (HH:MM:SS:FF)

Frame rate

Add or subtract

Frame offset

Your result

Enter your values.

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Updated 2026-09-19

Using the smpte timecode calculator

For integer frame rates, each timecode second contains the selected number of frame labels. Timecode uses hours:minutes:seconds:frames. Negative totals are rejected rather than wrapped into an unrelated day.

A worked example

At 30 fps, 00:00:10:00 represents 300 frames. Adding 15 frames gives 00:00:10:15.

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Before you use the result

Integer-rate non-drop-frame timecode only. Drop-frame semicolons and fractional rates such as 29.97 are rejected; those need different counting rules. Values are elapsed time, not wall-clock dates.

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ToolOctopus. “SMPTE timecode calculator.” Updated 2026-09-19. https://tooloctopus.com/smpte-timecode-calculator.

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