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Vinyl Record Playing Time Estimator

Estimate the playing time per side of a vinyl record based on RPM, groove dimensions, and record size. Useful for cutting engineers and record producers planning side lengths.

Turntable rotational speed. Standard LP = 33? RPM.
Distance from center to first groove. Standard 12" LP: �14.5 cm.
Distance from center to last groove. Standard LP: �6.0 cm (minimum 5.7 cm).
Distance between grooves. Wider spacing = fewer grooves = louder cut. Typical: 300�500 �m.

Results

Playing Time per Side6.4 minutes
Playing Time (seconds)383 sec
Total Groove Revolutions213
Total Groove Length13,686 cm

📖What is it?

A vinyl record's playing time depends on how many grooves fit in the available area and how fast the disc rotates. The groove spacing (pitch) is set by the cutting lathe engineer � closer spacing = more playing time but less modulation space = quieter, less dynamic sound. This is the fundamental trade-off in vinyl mastering: volume vs. length.

🎯How to use

Enter the record speed (RPM), the outer and inner groove radii (from the disc edge to the deadwax area), and the groove spacing in micrometers. Standard LP groove spacing ranges from 300�m (dense, long playing time) to 600�m (wide, louder cut). Results show estimated playing time per side.

💡Example scenario

A standard 12" LP at 33? RPM, outer radius 14.5 cm, inner 6.0 cm, groove spacing 400�m: groove area = p(14.5�-6�) = 547 cm�. Total groove length = 547/0.04 = 13,675 cm. Avg circumference = 2p�10.25 = 64.4 cm. Revolutions = 13,675/64.4 = 212. Time = 212/33.33 � 21.4 minutes per side � a typical LP side.

🏆Pro tip

For audiophile pressings, keep sides under 18�20 minutes and use 500�m groove spacing for maximum groove modulation and dynamic range. For dance music (12" singles), 45 RPM with large groove spacing gives the loudest, most dynamic cut. Never exceed 22�25 minutes per LP side � the inner grooves suffer from high tracking error angles and increased distortion as the stylus tracks the tighter circumferences.