Centrifuge RPM to RCF (g-Force) Calculator
Convert between RPM and g-force for your rotor radius.
Your numbers
Your results
RCF (× g)
RCF (× g)
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Speed (RPM)
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Centrifuge RPM to RCF (g-Force) Calculator by TheCalcTools
How the Centrifuge RPM to RCF (g-Force) Calculator works
Relative centrifugal force depends on both speed and radius: RCF = 1.118 × 10⁻⁵ × r (cm) × RPM². Protocols give × g because the same RPM produces different forces in different rotors.
Use the radius from the rotor centre to the sample (the maximum radius for pelleting).
The formula
RCF = 1.118 × 10⁻⁵ × r × RPM²; RPM = √(RCF ÷ (1.118 × 10⁻⁵ × r))
Worked example
Using the default values shown in the calculator:
| Convert | RPM to RCF (× g) |
|---|---|
| Speed (RPM) | 3000 |
| Relative centrifugal force (× g) | 1000 |
| Rotor radius (to the sample) | 10 |
- 3,000 RPM at 10 cm: 1.118 × 10⁻⁵ × 10 × 3,000² = 1,006 × g.
Result:
| RCF (× g) | 1,006 |
|---|---|
| Speed (RPM) | 3,000 |
Frequently asked questions
Where do I find the rotor radius?
In the centrifuge or rotor manual, usually as r_max in mm or cm.
Sources and further reading
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.