BPM Calculator
Tap a tempo. Every number that follows from it — delay times, note lengths, bar duration, frequency — updates at once.
- Free, no sign-up
- Runs in your browser
- Nothing is uploaded
- Every formula published
0 taps
Stability —
Beats per minute, 20 to 400.
Four beats of 4/4, pulsing at the tempo shown.
- Per beat
- ms
- Per bar (4/4)
- ms
- Frequency
- Hz
- 1/8 delay
- ms
Click any value to copy it. The tempo stays in the URL, so you can bookmark or share a result.
A BPM calculator turns a tempo in beats per minute into the values you actually work with. At 120 BPM a quarter note lasts 500 ms, a bar of 4/4 lasts 2,000 ms, and the pulse runs at 2 Hz. Tap the button below or type a tempo to see every derived value update at once.
Delay times at 120 BPM
Every note division in straight, dotted and triplet form. Straight values reinforce the grid, dotted values cross it, triplets fill it. The delay time calculator explains when to reach for each.
| Note | Straight | Dotted | Triplet |
|---|---|---|---|
| Whole note 1/1 | |||
| Half note 1/2 | |||
| Quarter note 1/4 | |||
| Eighth note 1/8 | |||
| Sixteenth 1/16 | |||
| Thirty-second 1/32 | |||
| Sixty-fourth 1/64 |
All values in milliseconds.
Finding a tempo in four steps
-
Tap the pulse
Press the spacebar or tap the button in time with the kick or snare — not the hi-hat, which usually subdivides the beat.
-
Keep going past eight
Each tap narrows the average. The stability figure tells you when the reading has settled rather than still drifting.
-
Sanity-check the number
If it looks wrong for the style, double or halve it. Most bad readings are half-time or double-time, not random error.
-
Take the values you need
Delay times, bar length, LFO frequency and frame counts all follow from that one tempo. Click any of them to copy.
Every tempo tool
One calculation each, done properly. All of them work from the same shared maths, so a value here matches a value there.
- Tap Tempo Counter Tap along with any track to find its BPM, with a live stability readout that tells you when the reading has actually settled. Keyboard or touch. Tool
- Online Metronome A sample-accurate metronome with time signatures, accented downbeats and subdivisions. Runs in the browser with no download and no sign-up. Tool
- Delay Time Calculator Tempo-synced delay times in milliseconds for every note division, including dotted and triplet values, with notes on what each one does. Tool
- Reverb Time Calculator Pre-delay and decay times that sit with your tempo instead of fighting it, with the note-division maths shown for room, plate and hall reverbs. Tool
- Bars and Song Length Calculator Convert bars to minutes and seconds at any tempo and time signature, and work backwards from a target duration to the number of bars. Tool
- BPM to Milliseconds Converter Convert any tempo to milliseconds per beat and back again. Covers every note division from whole notes to 1/64, straight, dotted and triplet. Converter
- BPM to Hertz Converter Convert tempo to frequency in hertz for LFOs, tremolo and any modulation rate set in Hz rather than note values. Covers every note division. Converter
- BPM to Frames Converter Work out how many video frames fall on each beat and bar at your tempo, and how far a bar drifts from whole frames, for cutting to music. Converter
- BPM and Pitch Calculator See what a tempo change does to pitch. Converts between two tempos, a percentage shift and semitones or cents, for turntables and samplers. Converter
- Tempo Change Calculator Work out half-time and double-time tempos, percentage changes and the difference between two tempos, with the effect on beat length shown. Converter
- Tempo Ranges by Genre Typical BPM ranges for common genres, with the overlaps and half-time ambiguities that trip up tempo detection, and what each range means in ms. Reference
- Tempo Markings and Their BPM Ranges What largo, adagio, andante, allegro and presto mean in beats per minute, why the ranges disagree between sources, and how to read them. Reference
Understand the numbers
Short, practical write-ups. Each one pairs with a tool, and each works through real values rather than placeholder examples.
- How to Find the BPM of a Song Four ways to find a track tempo, when each is accurate, and why tempo detection so often reports half or double the real value.
- The BPM to Milliseconds Formula Where 60,000 divided by BPM comes from, how note divisions scale from it, and worked examples at the tempos producers actually use.
- Setting Delay Times to Tempo Which note division to reach for, when dotted eighths work and when they clutter, and how to set a delay on a unit that only takes milliseconds.
- Reverb Decay and Pre-Delay What pre-delay and decay actually control, why tying them to tempo keeps a mix clear, and why there is no single correct reverb formula.
All tempo guides
Nine guides covering tempo detection, delay and reverb timing, arrangement maths, and how tempo interacts with pitch.
Common questions
How do you calculate BPM?
Count how many beats occur in a fixed span of time and scale it to a minute. Tapping does this automatically: the tool measures the gap between your taps, averages it, and divides 60,000 milliseconds by that average.
How many taps do I need for an accurate reading?
Eight or more. Each additional tap narrows the average, and the stability figure shown next to the result tells you how consistent your tapping was. A stability under about 10 ms means the reading has settled.
Why does my result come out at half or double the real tempo?
Because you tapped a different note value than the one the track is counted in. Drum and bass at 174 BPM has a half-time snare that invites tapping at 87. If the number looks wrong, try doubling or halving it.
What does BPM mean?
Beats per minute: how many beats fall inside one minute of music. A beat is conventionally a quarter note, so 120 BPM means 120 quarter notes per minute, or one every 500 milliseconds.
Checked, published, and open to correction
Every calculation on this site comes from one shared file that runs on the server and in your browser, so what gets rendered and what updates as you type cannot drift apart. That file is covered by an automated test suite checking each formula against hand-verified values, including at the boundaries.
The formulas themselves are published in full, along with the rounding behaviour and the one set of values — reverb decay — that is convention rather than calculation. Where something cannot be derived, the page says so instead of inventing precision.
Last reviewed Formulas published on the methodology page Spotted an error? Tell me