BPM Matcher
Enter or tap two tempos to see the speed change and pitch shift needed to match them.
Track to change
Tempo to match
Same tempo · 128.0 BPM
+6.67%
speed change (× 1.0667)
+1.12 st
pitch shift if you change speed and pitch together, like a turntable
Smallest change
Half time · 64.0 BPM
-46.67%
speed change (× 0.5333)
-10.88 st
pitch shift if you change speed and pitch together, like a turntable
Double time · 256.0 BPM
+113.33%
speed change (× 2.1333)
+13.12 st
pitch shift if you change speed and pitch together, like a turntable
How the numbers are worked out
Speed ratio
B ÷ A
The tempo you want divided by the tempo you have. 128 ÷ 120 = 1.0667.
Speed change
+6.67%
The ratio minus 1, as a percentage. This is the number for a DJ pitch fader.
Pitch shift
+1.12 st
12 × log2(ratio). How far the pitch moves if speed and pitch change together.
One semitone
≈ 5.95%
A speed change of about 6% moves the pitch by one semitone.
Half time and double time
Why it matters
A 70 BPM track and a 140 BPM track share the same beat grid. Matching 70 to 140 needs no speed change at all.
Which option to pick
The tool marks the option with the smallest change. Smaller changes keep the audio sounding natural.
Common pairs
Hip-hop at 85 BPM sits under house at 170 double time. Dubstep at 140 BPM is often felt as 70.
Applying the change
Keep the key
Use the speed changer. It time-stretches the audio, so the tempo changes and the pitch stays the same.
Change speed and pitch together
This is what a turntable or a sample-rate change does. The pitch moves by the semitones shown. Use the pitch shifter afterwards if you want to undo or adjust the pitch.
Tapping a tempo
Tap the button in time with the beat at least four times. The tool averages your last eight taps and resets after two seconds without a tap.
Questions about the bpm matcher
How do I convert a BPM change to a percentage?
Divide the new BPM by the old BPM, subtract 1 and multiply by 100. Going from 120 to 126 BPM is 126 ÷ 120 = 1.05, which is a 5% speed increase.
How many semitones does a BPM change shift the pitch?
12 × log2(new BPM ÷ old BPM). From 120 to 128 BPM that is about +1.12 semitones if the pitch is not locked.
Can I change the tempo without changing the pitch?
Yes. Time-stretching changes the tempo and keeps the key. Use the speed changer tool for this.
How far can I change the speed before it sounds bad?
Small changes of a few percent are usually hard to notice. Larger changes become easier to hear, especially on vocals. If half time or double time gives a smaller change, use that.
Is the BPM matcher free?
Yes. It is a calculator that runs in your browser with no account.