Timecode Calculator

Summary

Timecode Calculator lets you add or subtract SMPTE timecodes in HH:MM:SS:FF format without installing any software. Choose your frame rate — including drop-frame variants like 29.97 DF and 59.94 DF — enter two timecodes, pick an operation, and get the result instantly. All arithmetic runs in the browser; nothing is sent to a server.

How it works

1. Select the frame rate that matches your project (e.g. 29.97 DF for broadcast NTSC).
2. Enter the first timecode in HH:MM:SS:FF format in the "Timecode A" field.
3. Enter the second timecode in HH:MM:SS:FF format in the "Timecode B" field.
4. Click "+" to add or "−" to subtract the two timecodes.
5. The result appears in HH:MM:SS:FF format along with the equivalent total frame count and wall-clock duration.

Use cases

• Calculate the total running time of a sequence by adding clip timecodes.
• Find the in-point of a clip by subtracting a duration from an out-point.
• Verify edit math when conforming a cut to a locked picture.
• Convert between timecode and absolute frame numbers for scripting FFmpeg.
• Check drop-frame timecode arithmetic for broadcast deliverables.
• Sum multiple segment durations when assembling a programme reel.

Frequently Asked Questions