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Centrifuge RCF ⇄ RPM Converter

Rotor radius + RPM → g-force, and the RPM needed for a target RCF. The same math as the Excel workbook, live in your browser.

What this is for: Converts between centrifuge speed (RPM) and relative centrifugal force (× g) for your rotor radius.

The formula: RCF (× g) = 1.118e-5 × radius (cm) × RPM²

How to use:

  1. Measure the radius from the centre of the rotor to the bottom of the tube (max radius) for the true max RCF.
  2. In Section A, enter the rotor radius (cm) and speed (RPM) to read the RCF (× g).
  3. In Section B, enter the desired RCF (× g) and rotor radius (cm) to read the speed to set (RPM).

A. RPM → RCF

RCF (x g) = 1.118e-5 × rotor radius (cm) × RPM².

RCF (x g)

B. RCF → RPM

Speed to set (RPM)
Prefer to work offline or keep a copy? The download link is right below.
Download the Centrifuge RCF ⇄ RPM Converter workbook (.xlsx)
Notes & limits (from the workbook): RCF (x g) = 1.118e-5 × rotor radius (cm) × RPM². Measure the radius from the centre of the rotor to the BOTTOM of the tube (max radius) for the true max RCF.