How it works
A 54 BPM metronome clicks on a border. On a present-day Japanese dial pictured in German Wikipedia's Tempo article, Lento covers 48 to 54 and Adagio 54 to 58, so 54 carries both words. The article calls such bands approximate.
Read the full guide
Start
Tap the pad, or press Space. No click at 54 is raised, so no bar is implied. Tap again to stop.
Change the tempo
Tap the number under the pad and type a tempo, or use minus and plus. Twice 54 is 108, which has a page of its own. Two presses of plus reach 56, the next notch of the most common wind-up scale in Wikipedia's Metronome article.
Questions and answers
Is 54 BPM lento or adagio?
Both, in Wikipedia's list of tempo markings: Lento runs 40 to 60 and Adagio 44 to 66. Largo, Larghetto and Adagietto take in 54 as well. Andante does not: it begins at 56. The list calls its figures very rough approximations.
Is 54 BPM largo?
In Wikipedia's list of tempo markings, yes (40 to 66). Two older dials pictured in German Wikipedia agree: a 20th-century German one prints Largo over 40 to 60, a 19th-century French one over 42 to 70. Its Japanese dial splits 54 between Lento and Adagio.
How long is a bar of 4/4 at 54 BPM?
4.44 s, by our sum, though this page marks no bar. Split one beat and a dotted eighth takes 833.3 ms, an eighth 555.6 ms, a triplet eighth 370.4 ms and a sixteenth 277.8 ms.
Why can't I hear the metronome?
Give it a moment: clicks at 54 are over a second apart. If none comes, check the phone's ring switch, its volume and any Bluetooth headphones. The two dots take turns on each beat with or without sound.