Calculate RPM, radius, or G force from two known values with unit options for RPM/RPS and meters, centimeters, millimeters, inches, or feet.

Choose the value you want to calculate.
Required. Revolutions per minute.
Required. Relative centrifugal force in units of g.
Required. Distance from center of rotation to the tube.

RPM to G Force Formula

The following equation is used to calculate the G forces from RPM.

GF = (r × 2 × pi / 60 × RPM)² / r / 9.81
  • Where GF is the number of G forces
  • r is the radius of rotation
  • RPM is the number of rotations per minute
RPM to G-Force Conversion Table (Radius = 10 cm)
RPM (rpm) Radius (cm) G-Force (g)
5001027.95
7501062.89
1,00010111.80
1,20010160.99
1,50010251.55
2,00010447.20
2,50010698.75
3,000101,006.20
3,500101,369.55
4,000101,788.80
4,500102,263.95
5,000102,795.00
6,000104,024.80
7,000105,478.20
8,000107,155.20
9,000109,055.80
10,0001011,180.00
12,0001016,099.20
15,0001025,155.00
20,0001044,720.00
Assumes fixed radius r = 10 cm. Formula: g = ((2π × RPM / 60)² × r) / 9.81 ≈ 1.118×10⁻⁵ × r(cm) × RPM².

Can RPM be converted to G Force?

RPM can be converted to G force if you also know the radius of rotation. In this example, the RPM is first converted to tangential velocity, then the number of g forces is calculated.

How to Calculate G Force from RPM?

Example Problem:

The following example outlines the steps and information needed to calculate the g forces from RPM.

First, determine the total rotations per minute. In this example, the RPM is 50.

Next, determine the radius of rotation. This is provided as 2 m.

Finally, calculate the g forces from the rpm using the formula above:

GF = (r*2*pi/60*RPM)^2 / r / 9.81

GF = (2*2*3.14159/60*50)^2 / 2 / 9.81

GF = 5.589 G forces