Centrifuge RCF Calculator

Convert between RPM and relative centrifugal force (×g), calculate k-factor and estimate sedimentation time.

Rotor speed (RPM)

Max rotor radius (cm)

Min rotor radius (cm)

Particle diameter (μm)

Tab to move between fields

RCF at rMax (×g)

1,006.2

RCF at rMin (×g)503.1

RCF ratio (max/min)2

k-factor19,485.1

RPM for 1,000 ×g2,991

Angular velocity (rad/s)314.16

Tip speed (m/s)31.42

Est. sedimentation time (min)15.2

Centripetal Accel Ms29,869.6

How to Use This Calculator

Enter the centrifuge rotor radius in millimeters (from rotor specs or measured to sample midpoint).
Input the desired RCF (relative centrifugal force) in xg from your protocol.
Review the calculated RPM to set on your centrifuge.
Alternatively, enter your RPM to back-calculate the RCF you are achieving.
Always verify rotor max speed and confirm RCF is within safe limits before running.

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