Vinyl RPM Calculator
Playback Time Estimate
Estimate playback time based on record size and RPM
Speed / Pitch Correction
Calculate pitch change when playing a record at the wrong speed
Formula
Playing Time = Total Grooves / RPM | Total Grooves = Groove Width x Lines Per Inch | Pitch Shift = 12 x log2(actual RPM / intended RPM)
Frequently Asked Questions
What is the difference between 33, 45, and 78 RPM?
33 1/3 RPM is for LPs (long play albums, typically 12"). 45 RPM is for singles (typically 7"). 78 RPM is the oldest format used for shellac records. Higher RPM generally means better audio quality but shorter playing time.
How long does a vinyl record play per side?
A standard 12" LP at 33 1/3 RPM plays about 20-25 minutes per side. A 7" single at 45 RPM plays about 4-5 minutes per side. Actual times depend on groove spacing and loudness of the recording.
What happens if I play a record at the wrong speed?
Playing at the wrong speed changes both pitch and tempo. A 33 RPM record played at 45 RPM will sound about 5.1 semitones higher and 35% faster. A 45 played at 33 will sound lower and slower.
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