About the Timecode Calculator
Add, subtract and convert SMPTE timecode, with drop-frame handling.
Also known as: smpte timecode calculator, timecode converter, add timecode, drop frame calculator.
How to use this calculator
- Enter first timecode, operation, frame rate.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
total frames = (HH×3600 + MM×60 + SS) × fps + FF
Worked example
Using the values pre-filled in the calculator above:
- First timecode: 00:01:30:12
- Operation: Add
- Second timecode: 00:00:45:18
- Frame rate: 24 fps
the calculator returns:
- Result: 00:02:16:06
- Total frames: 3,270
- Real duration: 2 min 16 s
- In seconds: 136.25