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About this tool
Turn a turntable or CDJ pitch percentage into the resulting tempo, key shift and track length.
The Pitch Percent BPM Calculator converts a turntable or CDJ pitch fader position into the tempo the record actually plays at, using resulting BPM = written BPM x (1 + pitch / 100). Because pitch changes the playback rate, it also reports the musical side of the same move: the key shift is logarithmic at 1200 x log2(1 + pitch / 100) cents, which is why +6% raises the track by about one semitone rather than by 6% of an octave. The running time shortens by the same ratio, so a five-minute record at +8% finishes 22 seconds early.
Open Pitch Percent BPM Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
One move changes all three, and all three are shown side by side.
Flags whether the pitch you need fits ±6, ±8, ±10, ±16 or ±50% hardware.
Includes the exact +35% and -25.93% figures for playing a record at the wrong platter speed.
Multiply the written tempo by one plus the pitch divided by a hundred. A 128 BPM track at +8% plays at 128 x 1.08 = 138.24 BPM; at -6% it plays at 120.32 BPM. The same ratio applies to the running time, which divides rather than multiplies.
The shift is 1200 x log2(1 + pitch / 100) cents, so +6% is 100.9 cents — almost exactly one semitone — and +8% is 133.2 cents, a little over a semitone. Half a semitone, roughly ±3%, is where most listeners start to hear the vocal change.
Exactly +35%, because 45 divided by 33 1/3 is 1.35. Played the other way, a 45 rpm record on the 33 1/3 setting runs at -25.93%, which is a drop of just over four semitones.
Turn it on when the shift crosses about 50 cents — roughly ±3% — and the track is harmonically mixed or has a prominent vocal. Key lock time-stretches instead of changing the rate, so it preserves pitch at the cost of some smearing on transients, which becomes noticeable past around ±8%.
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