40 BPM metronome
Press Start for a steady click from 20 to 300 BPM. Tap the tempo, pick a time signature and accent any beat.
BPM · Largo
Time signature
Subdivision: Quarter notes
Metronome by BPM
This metronome is already set to 40 beats per minute, a tempo musicians call Largo. Press Start to hear it, and change the tempo, time signature or accents at any time. 40 BPM is a common tempo for slow, careful practice of a new piece, long tones and scale warm-ups and slow breathing and meditation. At 40 BPM each beat lasts 1,500 milliseconds, eighth notes are 750 ms apart and a bar of 4/4 takes 6 seconds.
How to use it
- Set the tempo: drag the slider, use − and +, type a number or tap along with Tap tempo.
- Pick a time signature and, if you like, a subdivision. Click a beat to change its accent.
- Press Start (or the Space bar). Press again to stop.
Frequently asked questions
What tempo should I practise at?
Start slowly enough to play the passage perfectly, often 60–70% of the target tempo, then raise it by 4–5 BPM at a time once it feels easy. Practising mistakes at speed only trains the mistakes.
How does tap tempo work?
Tap the button (or press T) along with the beat of a song. After two taps the metronome shows the tempo, and it averages up to the last eight taps for a steadier reading. Pause for two seconds to start over.
Is this metronome accurate?
Yes. Clicks are scheduled ahead of time on the audio hardware clock, not with a JavaScript timer, so the timing is accurate to well under a millisecond and doesn't wobble when the page is busy.
Does it work in the background and on my phone?
Yes. It keeps playing when you switch tabs or apps in most browsers. On iPhone, turn off silent mode: iOS mutes web audio when the ring/silent switch is on.
Are there keyboard shortcuts?
Space starts and stops, the arrow keys change the tempo by 1 BPM (hold Shift for 10) and T taps the tempo.
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