DataCalc
Timecode Calculator
Professional timecode calculator with a TI-83 style interface. Enter timecode with a numeric keypad, perform calculations, and keep track of your calculation history with a paper tape.
ex: 15, 2.., 1h 30m, +20.
How this calculator works
The Timecode Calculator adds, subtracts, multiplies, and divides SMPTE timecode at any professional frame rate — 23.976, 24, 25, 29.97 (drop and non-drop), 30, 50, 59.94, and more — with a calculator-style keypad and a running paper tape of your work.
Timecode math trips people up because it is base-60 for hours, minutes and seconds but base-frame-rate for frames, and because 29.97 drop-frame renumbers frames to stay in sync with the clock. This tool handles those rules for you and converts between frame rates without losing frames.
Timecode to total frames
Total frames = ((hours × 3,600 + minutes × 60 + seconds) × frame rate) + frames
Example: 01:00:00:00 at 24 fps = 86,400 frames.
| Frame rate | Where it's used |
|---|---|
| 23.976 | Digital cinema-style acquisition for TV/streaming delivery |
| 24 | Theatrical film and DCPs |
| 25 | PAL-region broadcast and production |
| 29.97 DF/NDF | NTSC-region broadcast; drop-frame keeps clock time |
| 50 / 59.94 | Sports, live production, high-motion content |
Frequently asked questions
What is drop-frame timecode?
At 29.97 fps, timecode counting 30 frames per second drifts about 3.6 seconds per hour versus real time. Drop-frame timecode skips frame numbers 00 and 01 at the start of each minute (except every tenth minute) so the timecode display matches wall-clock time. No actual video frames are dropped — only numbers.
How do I add two timecodes together?
Convert each timecode to total frames at your frame rate, add them, then convert back. That's exactly what this calculator does — enter the first timecode, press +, enter the second, and press =.
Why does 23.976 fps exist instead of just 24?
When color was added to NTSC television, the field rate was slowed by a factor of 1000/1001 to avoid interference, giving 29.97 fps. Film content transferred into that system inherited the same ratio: 24 × 1000/1001 = 23.976. It survives today for broadcast compatibility.
Can I convert a timecode from one frame rate to another?
Yes — but be clear about intent. Keeping the same frame count changes the real-time duration; keeping the same duration changes the frame count. This calculator supports frame-accurate conversion between any two supported rates.
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DataCalc is built by CONFORM.TOOLS — professional conform and post-production software for editors, assistant editors, and finishing artists. If DataCalc saves you time, take a look at what else we make.