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Molbiotools is a collection of free online apps:

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Centrifugation calculator

A free online tool for centrifugation parameter (rotation radius, RPM and RCF) calculations.

Formulas

centrifugation physics
RCF - relative centrifugation force
RPM - revolutions per minute
ω - angular velocity
r - rotation radius
g - standard gravity
Clear
Calculate

Calculator

Fill in two out of the three fields and click 'Calculate'.

Rotation radius:cm
RPM:min-1
RCF:g