Frame Rate & Speed CalculatorFrame Rate & Speed Calculator
Conform, retime and pulldown — what really happens to your footage when the rate changes.
Play the same frames at a different rate — no interpolation, just reinterpretation (the classic 24p → 25p PAL case).
Audio keeps the same samples at a new speed, so it will need pitch correction or resampling to sound right.
Change a clip's speed to hit a target — get the speed %, the resulting duration, and the capture fps for true slow motion.
Pulldown maps film-rate frames onto NTSC video rates by repeating fields. It's specialized — most modern work won't need it.
Advanced 2:3:3:2 cadence (DVCPRO HD) keeps the same 4→5 frame ratio but groups the repeated fields differently for cleaner removal.
What is a frame rate & speed calculator?
A frame rate and speed calculator answers the everyday "what happens to my footage when the rate changes" questions. Conforming reinterprets the same frames at a new rate (24p played at 25p runs faster and shorter — the PAL speedup). Retiming changes a clip's speed to hit a target duration and tells you the exact percentage. Pulldown spreads film-rate frames across NTSC video. Editools does all of it with exact, frame-accurate math in your browser at your chosen frame rate, drop-frame included.
How to use it
- Pick a mode: Conform to reinterpret frames at a new rate, Retime to change speed, or Pulldown for film-to-NTSC.
- Choose your source and target frame rates and enter the clip length as timecode, frames or seconds.
- Read the new duration, speed percentage, pitch shift or pulldown cadence — each with a plain-language explanation — and copy the breakdown.
When editors use it
Conforming a 24p master to 25p for European delivery, working out the speed percentage of a ramp, checking how a clip's duration and timecode change when interpreted at another rate, planning a high-fps shoot for clean slow motion, or adding and removing 2:3 pulldown on film and NTSC jobs. It's the math that's quick on paper until mixed rates, drop-frame and pitch shifts get involved.
Frequently asked questions
What is PAL speedup?
PAL speedup is what happens when 24 fps film is conformed to 25 fps for PAL/European delivery. The same frames play 1 fps faster, so the program runs about 4.17% faster and shorter, and the audio rises roughly 0.71 of a semitone unless it's pitch-corrected.
How do I conform 24 to 25 fps?
Conforming 24 to 25 fps reinterprets the existing frames at the higher rate without adding or interpolating frames. A 60-second clip becomes 57.60 seconds (+4.166% speed), the frame count is unchanged, and the audio needs pitch correction. Use Conform mode and pick 24 → 25.
What speed do I need for slow motion?
For clean slow motion without interpolation you capture more frames than you play back. To get 50% slow motion at 25p you shoot at 50 fps; for 25% slow-mo you shoot at 100 fps. Retime mode shows the exact capture fps for any target speed.
What is 2:3 pulldown?
2:3 (3:2) pulldown converts 23.976/24 fps film to 29.97/30 fps interlaced video by spreading 4 progressive frames across 5 video frames in a 2:3:2:3 field cadence. Reverse pulldown removes those repeated fields to recover the original 24 fps.