Convert Radians per minute to Revolutions per minute
Convert Radians per minute (rad/min) to Revolutions per minute (rpm) instantly and accurately.
Conversion Formula
rpm = rad/min × 0.1591549431
About Radians per minute
The radian per minute (rad/min) equals 1/60 rad/s ≈ 0.01667 rad/s, convenient for wind turbine rotors and slow industrial drives. Large direct-drive offshore wind turbines (14-15 MW, e.g. Siemens Gamesa SG 14-222, Vestas V236) rotate at 4-15 rad/min (0.064-0.24 rpm). Pharmaceutical coating pans rotate at 0.5-10 rad/min; large CNC rotary tables for turbine disc machining run at 0.2-8 rad/min. VLT 8.2 m telescope tracks stars at the sidereal rate π/720 ≈ 0.00436 rad/min. 1 rad/min = 1/60 rad/s ≈ 0.1592 rpm.
About Revolutions per minute
The revolution per minute (rpm) equals π/30 rad/s ≈ 0.1047 rad/s, the most universally recognised rotational speed unit in mechanical engineering. Common references: car petrol engines idle at 600-900 rpm, redline at 5500-8500 rpm; large marine diesel engines run at 75-120 rpm; electric induction motor synchronous speed = 60f/p rpm (3000 rpm at 50 Hz, 2-pole); hard drives at 5400-15000 rpm; dental turbines up to 400000 rpm; washing machine spin 400-1600 rpm. ISO 6336 and ANSI/AGMA gear standards use rpm throughout. 1 rpm = π/30 rad/s = 6 °/s = 1/60 rps.
Quick Reference Table
| Radians per minute (rad/min) | Revolutions per minute (rpm) |
|---|---|
| 1 rad/min | 0.159155 rpm |
| 2 rad/min | 0.31831 rpm |
| 5 rad/min | 0.795775 rpm |
| 10 rad/min | 1.59155 rpm |
| 25 rad/min | 3.97887 rpm |
| 50 rad/min | 7.95775 rpm |
| 100 rad/min | 15.9155 rpm |