← All tools

BPM Pitch Fader Calculator

Match one tempo to another and read the pitch fader setting, the key change and how far apart two tracks drift.

the track you are changing, in beats per minute
the tempo you want to land on
the end stops of the fader, not how far you push it
Enter both tempos to see the fader setting.

The fader is treated as a linear tempo trim: a setting of p percent plays the track at 1 + p/100 times its nominal tempo, so matching tempo is the ratio of the two BPM values. The key change follows the same ratio because varispeed playback shifts pitch with speed: an octave is a 2:1 frequency ratio and holds 1,200 cents, so the shift is 1,200 × log₂(target ÷ source) cents. Fader travel is reported on a scale where the centre detent is 50% and each end stop is 0% or 100%. Drift is how long two tracks running unsynced take to slip one beat, which is 60 ÷ |target − source| seconds. Keylock (master tempo) on CDJs and DJ software holds the pitch while the tempo changes, so the key figure applies only to varispeed, vinyl and turntable playback; fader steps and the exact response curve of a given player are not modelled. Everything runs in your browser with no storage, uploads or network access.