Free browser tool
Tempo transition calculator
Measure the size and direction of a BPM move, then use evenly spaced staging points as rehearsal prompts—not rules.
Tempo change—
Absolute change—
25% point—
Midpoint—
75% point—
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Large tempo changes can alter groove and pitch or expose time-stretch artefacts. Audition the actual recordings and respect the limits of your playback tools.