Frame rate converter conform, new length, speed and audio pitch.
Pick the rate your footage was shot at and your timeline rate. The calculator shows the new speed, how long the clip runs after the conform, how many semitones the audio moves without pitch correction and where each timecode lands on the new timeline. Works for 24 to 25, 120 fps slow motion and 23.976.
Free, no sign-upConform result
- Speed
- -
- New length
- -
- Audio pitch, uncorrected
- -
- Speed-up
- -
Pitch = how far the audio moves if it plays along uncorrected. With pitch correction, only the length changes.
Conform
Reinterprets the frames: no frame is added or removed, so the speed changes with the rate.
Conversion
Keeps the real speed: the software repeats, drops or blends frames to reach the new rate.
New length of a clip
- Frames
- Original length
- After the conform
- Difference
- If converted
Timecodes on the new timeline
Paste one timecode per line, at the original rate (notes after the timecode are ignored). We show where each lands after the conform and, to compare, where it would land in a conversion.
| Source | Conform | Time (s) | Conversion |
|---|
Common cases
Tap Use to load a case into the calculator.
| From | To | Use | Speed | Length | Pitch | Calculate |
|---|---|---|---|---|---|---|
| 24 | 25 | 24 fps film for PAL TV (PAL speed-up) | +4.17% | 57:36 | +0.71 | |
| 23.976 | 25 | 23.976 for a 25 fps delivery | +4.27% | 57:32.5 | +0.72 | |
| 25 | 24 | 25 fps footage on a 24 timeline | -4.00% | 1:02:30 | -0.71 | |
| 23.976 | 24 | 23.976 to 24 (pull-up) | +0.10% | 59:56.4 | +0.02 | |
| 24 | 23.976 | 24 to 23.976 (pull-down) | -0.10% | 1:00:03.6 | -0.02 | |
| 48 | 24 | 48 fps as 50% slow motion | -50.00% | 2:00:00 | -12.00 | |
| 50 | 25 | 50 fps as 50% slow motion | -50.00% | 2:00:00 | -12.00 | |
| 59.94 NDF | 23.976 | 60 fps phone clip on a 24 timeline | -60.00% | 2:30:00 | -15.86 | |
| 59.94 NDF | 29.97 NDF | 59.94 as 50% slow motion | -50.00% | 2:00:00 | -12.00 | |
| 120 | 24 | 120 fps as 20% slow motion | -80.00% | 5:00:00 | -27.86 | |
| 120 | 30 | 120 fps on a 30 timeline | -75.00% | 4:00:00 | -24.00 |
After the conform, need to find lines in the footage? We transcribe every word with its timecode. Try it free
How to calculate a frame rate conform
- 01
Pick both rates
The rate the footage was shot at and the rate of the timeline it goes into. For 29.97 and 59.94, choose DF or NDF.
- 02
Read speed, length and pitch
The result shows right away. Type a length as timecode, frames or time to see how long the clip runs afterwards.
- 03
Bring your timecodes
Paste the source timecodes, such as client notes or camera logs, and download the table with their place on the new timeline.
What is the difference between conforming and converting frame rate?
A conform reinterprets the frames. A 120 fps file on a 24 fps timeline shows exactly the same frames, just 24 per second: the action plays five times slower and no image is invented. That is how clean slow motion is made, and how a 24 fps film becomes 25 for European TV. The length changes, the quality does not.
A conversion keeps the real speed and adjusts the number of frames. To go from 29.97 to 25, the software drops, repeats or blends frames (with simple blending or optical flow). The length stays the same, but motion can stutter or ghost. Convert when real time must be kept, as in interviews, concerts or live events.
In Premiere Pro, conforming lives in Interpret Footage, under Assume this frame rate. In DaVinci Resolve, in Clip Attributes, under the video frame rate. In Final Cut Pro, in Automatic Speed, in the retime menu.
- Conform: same frames, different speed and length.
- Conversion: same length, frames repeated, dropped or blended.
- Drop frame changes no frames at all: it is only how timecode is numbered.
Why does 24 fps at 25 play 4% faster?
On PAL television, films shot at 24 frames per second were shown at 25 without changing a single frame. Every second of picture lasts 24/25 of a second: the film plays 4.1667% faster and one hour becomes 57 minutes 36 seconds. This is the well known PAL speed-up, and it still explains why a film runs shorter in a European release.
Audio that follows that conform goes up with it: 0.7067 semitone, almost 71 cents, if nobody corrects it. Voices sound a bit higher and music leaves its original key, which is why PAL versions usually get pitch correction. Between 23.976 and 24 the gap is only 0.1%, or 1.73 cents, which nobody hears, but the drift reaches 3.6 seconds per hour and pulls separately recorded audio out of sync.
| Conform | Speed | 1 hour becomes | Audio pitch |
|---|---|---|---|
| 24 to 25 | +4.1667% | 57:36 | +0.71 semitone |
| 23.976 to 25 | +4.2708% | 57:32.5 | +0.72 semitone |
| 25 to 24 | -4% | 1:02:30 | -0.71 semitone |
| 23.976 to 24 | +0.1% | 59:56.4 | +1.73 cents |
How to calculate slow motion from 60 or 120 fps
Divide the timeline rate by the shooting rate. 120 fps footage on a 24 fps timeline plays at 20% speed, five times slower: 2 seconds of recording become 10 on the timeline. At 60 fps on a 24 timeline the speed is 40% and the factor 2.5. Phones that record at 59.94 give the same result on a 23.976 timeline.
The calculator does that math for any pair, shows the new length of a clip typed as timecode, frames or time, and tells you how many frames the same clip would have in a conversion. Slow motion audio is rarely used: it drops a full octave at 50% and becomes unrecognizable at 20%.
Where do timecodes land after a conform?
If you get notes with timecodes from the original footage, you need the same points on the conformed timeline. In a conform, frame 252 is still frame 252, but its label changes: 10 seconds and 12 frames at 24 fps become 10 seconds and 2 frames at 25. Paste the list, enter the source start and the new timeline start, and the table shows where every note lands.
The same table has a conversion column, showing where the same real moment would land if the change had kept the speed. When the two columns differ, you know the footage was conformed, not converted. The table goes to CSV or to your clipboard.
More than a frame rate converter. Your footage arrives with every line timed.
Frequently asked questions
Does changing the frame rate reduce video quality?
Not in a conform: the frames are the same, only the speed changes. A conversion can lose smoothness, because the software repeats, drops or blends frames. That is why slow motion and the PAL speed-up are done by conforming, and live broadcasts or interviews by converting.
How much faster is 24 fps played at 25?
4.1667%. One hour becomes 57 minutes 36 seconds and the audio rises 0.7067 semitone if it is not corrected. From 23.976 to 25 the change is slightly bigger: 4.2708%.
Are 23.976 and 24 fps the same?
No. 23.976 is 24000/1001, about 0.1% slower than 24. It sounds small, but it is 3.6 seconds per hour: enough to pull separately recorded audio out of sync in a long interview. Check the file's real rate before building the timeline.
How slow is 120 fps on a 24 fps timeline?
20% speed, five times slower. On a 30 fps timeline it plays at 25%, four times slower. Type the clip's length to see how long it runs on the timeline.
Does drop frame change the video speed?
No. Drop frame at 29.97 and 59.94 skips timecode labels, never frames, so the timecode clock matches real time. Speed and length are identical in DF and NDF. The calculator reads and writes both.
How do I fix the audio pitch after a conform?
Turn on pitch correction when you change the speed in your editor (in Premiere, Maintain Audio Pitch in Speed/Duration), or apply a pitch shift of the same amount the other way: if the conform raised it 0.71 semitone, lower it 0.71.
Footage conformed, every line in place. We find each moment.
Upload the video or paste a YouTube link. We transcribe it with timecodes, find the best moments and deliver captions, clips and a timeline for your editor.
See the result on your own recording before adding a card.