Timecode Calculator
Use this calculator timecode tool to add or subtract timecodes and convert between timecode, frames, and seconds.
Note: This tool uses non-drop-frame math. For 29.97 and 59.94, frame counting uses nominal values (30/60) for display.
Timecode → Seconds
Seconds → Timecode
What is a timecode calculator?
A timecode calculator helps you do precise time math for video and audio projects. Instead of manually counting hours, minutes, seconds, and frames, you can instantly calculate edits, runtimes, and cue points using one reliable tool.
When editing content, a tiny error can throw off subtitles, chapter markers, transitions, or export settings. A calculator timecode workflow reduces those mistakes and saves real production time.
How to read timecode format
The standard display is HH:MM:SS:FF:
- HH = hours
- MM = minutes
- SS = seconds
- FF = frames
Frames are the smallest unit in the display. The valid range for frames depends on frame rate. At 30 fps, frame values run from 00 to 29.
Why frame rate matters
Frame rate changes the meaning of every frame value. For example, 300 frames is 10 seconds at 30 fps but 12 seconds at 25 fps. That is why you should always set the frame rate first before doing timecode calculations.
Common frame rates
- 23.976 fps: cinematic and digital delivery workflows
- 24 fps: traditional film timing
- 25 fps: PAL broadcast regions
- 29.97 / 30 fps: NTSC and web/video production
- 50 / 59.94 / 60 fps: sports, high-motion, and smooth playback content
What you can do with this calculator
1) Add and subtract timecodes
Need a total runtime for a segment list? Add them. Need to remove a clip duration from a sequence? Subtract it. The calculator returns:
- Resulting timecode
- Total frame count
- Equivalent seconds
2) Convert timecode to seconds
This is useful for scripting, automation, motion graphics timing, and API-based workflows that expect seconds instead of timecode.
3) Convert seconds to timecode
Perfect for taking analytics timestamps, transcription timings, or cue data and matching them back to your editing timeline.
Practical use cases
- Video editing: Verify exact in/out lengths before a final render.
- Podcast production: Align intro music fades and chapter markers.
- Course creation: Build lesson markers and segment summaries.
- Live events: Prepare countdowns and lower-third timings.
- Post-production review: Communicate precise notes frame-by-frame.
Tips to avoid timecode mistakes
- Always confirm timeline frame rate before calculating.
- Keep one consistent timecode format across your team.
- Double-check frame ranges (for example, no frame 30 at 30 fps).
- Use conversion checks when moving between software tools.
Final thoughts
A dependable calculator timecode tool is one of those small systems that pays off quickly. It improves speed, reduces revision cycles, and gives you confidence that every cut, subtitle, and cue lands exactly where it should.