Skip to content
Calculator Tools
Mechanical Engineering Calculators

RPM Calculator

Convert between RPM, surface speed and angular velocity for shafts, wheels and tools.

Enter values

Results update as you type.

Result

Rotational speed

1,450 RPM

Surface speed
455.531 m/min
Radians per second
151.8436
Revolutions per second
24.1667
Degrees per second
8,700
Time per revolution
0.04138 s
Surface speed (m/s)
7.5922

About the RPM Calculator

Convert between RPM, surface speed and angular velocity for shafts, wheels and tools.

Also known as: revolutions per minute, rpm to rad/s, surface speed to rpm, shaft speed.

How to use this calculator

  1. Enter calculate.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

surface speed = π × d × RPM · ω = 2π × RPM / 60

Worked example

Using the values pre-filled in the calculator above:

  • Calculate: Surface speed from RPM
  • Rotational speed = 1,450 RPM
  • Diameter = 100 mm

the calculator returns:

  • Rotational speed: 1,450 RPM
  • Surface speed: 455.531 m/min
  • Radians per second: 151.8436
  • Revolutions per second: 24.1667