Type a tempo, or tap it in, and get the length of every note value in milliseconds: whole notes down to 1/64 notes, each straight, dotted and triplet. That is what you set on a delay, a reverb pre delay or a compressor release so it moves with the song. The same table gives each note as a rate in Hz, for an LFO, tremolo or auto pan synced to the beat. You also get the length of a bar in common time signatures, samples per beat at 44.1 and 48 kHz, and the reverse: milliseconds or Hz back to BPM. It runs in your browser, needs no sign in and costs nothing.
Divide 60,000 by the BPM to get the length of one beat (a quarter note) in milliseconds. At 120 BPM that is 500 ms. Halve it for an eighth note, halve it again for a sixteenth, and double it for a half note.
A dotted note is one and a half times the plain note, and a triplet is two thirds of it. At 120 BPM an eighth note is 250 ms, a dotted eighth is 375 ms and an eighth note triplet is about 166.67 ms.
Start with a quarter note or a dotted eighth for a rhythmic echo that sits in the groove, and an eighth or sixteenth note for a tighter slap. Reverb pre delay often works at a short note value like a 1/64 or 1/32 so the tail starts in time. Trust your ears after that.
Divide the BPM by 60 to get beats per second, which is the rate in Hz for one cycle per quarter note. At 120 BPM that is 2 Hz. For one cycle per bar of 4/4, divide by 4 again: 0.5 Hz. The table lists every note value in Hz.
In 4/4 a bar is four beats, so multiply the beat length by 4. At 120 BPM a beat is 500 ms and a bar is 2 seconds. In 6/8 the calculator reads the BPM as quarter notes, so a bar of six eighth notes is three beats long: 1.5 seconds at 120 BPM.
Multiply the sample rate by 60 and divide by the BPM. At 120 BPM a beat is exactly 22,050 samples at 44.1 kHz and 24,000 samples at 48 kHz. At many tempos the result is not a whole number, which is why loop points sometimes need rounding.
Yes. Tap the button along with the music and the calculator picks up the tempo from your last taps, the same way Tap Tempo (BPM Tapper) does. For a steady click at that tempo, open it in the Online Metronome.
Yes. It is free, needs no sign in and runs in your browser. To slow a song down or move it to another key without changing the other, use Change Pitch and Tempo.