Music guide
Vinyl RPM: Record Speeds and How Playback Speed Changes Pitch
Understand 33, 45, and 78 rpm record speeds and what happens when a record is played at the wrong speed.
Written by James — Founder & Builder, BoringToolsKit · Published 2026 · Planning information, not professional advice.
Standard speeds and their uses
Long-playing albums spin at 33⅓ rpm, singles at 45 rpm, and older shellac records at 78 rpm. Each speed supports a different groove density, which is why albums fit 20 minutes per side and 45s sound brighter with more headroom.
Playing at the wrong speed shifts everything
Playing a 45 rpm single at 33 rpm slows it down by about 27%, lowering pitch by roughly a fifth and dragging the tempo. Playing a 33 rpm LP at 45 rpm speeds it up and raises pitch. The pitch shift is proportional to the speed ratio, and the converter shows exactly how far.
Checking speed in practice
If a record sounds too fast or too slow, confirm the intended speed first. Vintage 78s and promotional pressings can vary, so compare pitch against a known reference. Many turntables and DJ setups allow pitch control, which is the only way to play at a slightly different speed on purpose.