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Timecode math, sorted.
Add or subtract timecodes and convert between timecode, frames, and real duration — at any frame rate. The everyday editor calculation, without counting on your fingers.
non-drop · HH:MM:SS:FF
— frames
— frames
Result
00:00:00:00
Total frames 0Real duration 0s
Non-drop-frame timecode (TC frames use the nominal rate — 23.976→24, 29.97→30, 59.94→60). "Real duration" uses the true frame rate, so 24 vs 23.976 differ slightly. Subtracting past zero clamps to 00:00:00:00.
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