1,500 RPM to g

1,500 RPM at common rotor radii

How to find the × g of 1,500 RPM

1. Find the radius of your rotor in cm, from the centre of the rotor to the bottom of the tube. It is printed on the rotor or in its manual. Enter it above; 1,500 RPM is already filled in.
2. The force in × g is shown as you type. The table below gives it for common radii.
3. Compare it with the × g your protocol asks for, and adjust the speed if needed.

Frequently asked questions

How many g is 1,500 RPM?

It depends on the rotor. At an 8.5 cm radius, typical for a microcentrifuge, 1,500 RPM is about 214 × g; at 10 cm it is about 252 × g. The formula is RCF = 1.118 × 10⁻⁵ × r × RPM², with r in cm.

Why do protocols give × g rather than RPM?

The same RPM gives a different force in every rotor, while × g is the force on the sample itself, so a protocol in × g works on any centrifuge.

What happens at twice the speed?

Force rises with the square of the speed: NaN RPM gives four times the force of 1,500 RPM, about 855 × g in an 8.5 cm rotor.