Convert Radians per minute to Revolutions per hour
Convert Radians per minute (rad/min) to Revolutions per hour (rev/h) instantly and accurately.
Conversion Formula
rev/h = rad/min × 9.549296586
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 hour
The revolution per hour (rev/h) equals π/1800 rad/s ≈ 1.745 × 10⁻³ rad/s, used for very slow rotating machinery. Cement rotary kilns - the world's longest continuously rotating machines (up to 230 m, 4000 t) - rotate at 1-5 rev/h; ball mills for ore grinding at 10-20 rev/h; concrete mixer trucks at 1-4 rev/h during transport. Large astronomical antenna drives and slow-scan telescope azimuth movements are also conveniently expressed in rev/h. 1 rev/h = π/1800 rad/s ≈ 0.02778 rpm.
Quick Reference Table
| Radians per minute (rad/min) | Revolutions per hour (rev/h) |
|---|---|
| 1 rad/min | 9.5493 rev/h |
| 2 rad/min | 19.0986 rev/h |
| 5 rad/min | 47.7465 rev/h |
| 10 rad/min | 95.493 rev/h |
| 25 rad/min | 238.732 rev/h |
| 50 rad/min | 477.465 rev/h |
| 100 rad/min | 954.93 rev/h |