RPM to g (RCF) Calculator
RCF = 1.118 × 10⁻⁵ × r (cm) × RPM². Enter the rotor radius plus either speed or g-force.
RPM to × g chart
| RPM | r = 5 cm | r = 7.5 cm | r = 10 cm | r = 15 cm |
|---|---|---|---|---|
| 1,000 | 56 × g | 84 × g | 112 × g | 168 × g |
| 2,000 | 224 × g | 335 × g | 447 × g | 671 × g |
| 3,000 | 503 × g | 755 × g | 1,006 × g | 1,509 × g |
| 4,000 | 894 × g | 1,342 × g | 1,789 × g | 2,683 × g |
| 5,000 | 1,397 × g | 2,096 × g | 2,795 × g | 4,193 × g |
| 8,000 | 3,578 × g | 5,366 × g | 7,155 × g | 10,733 × g |
| 10,000 | 5,590 × g | 8,385 × g | 11,180 × g | 16,770 × g |
| 12,000 | 8,050 × g | 12,074 × g | 16,099 × g | 24,149 × g |
| 13,000 | 9,447 × g | 14,171 × g | 18,894 × g | 28,341 × g |
| 15,000 | 12,577 × g | 18,866 × g | 25,155 × g | 37,733 × g |
Typical radii: microcentrifuge ≈ 7–8.5 cm; benchtop swing-bucket ≈ 15–18 cm. Check your rotor's manual.
FAQ
What is the formula for converting RPM to g (RCF)?
RCF = 1.118 × 10⁻⁵ × r × RPM², where r is the rotor radius in centimeters (measured from the center of the rotor to the bottom of the tube).
How do I convert g-force to RPM?
RPM = √(RCF ÷ (1.118 × 10⁻⁵ × r)).
Why do protocols specify × g instead of RPM?
The same RPM produces different forces in rotors of different sizes. RCF (× g) is the force the sample actually experiences, so it transfers between centrifuges.
Which radius should I use?
Use the maximum radius (r max) listed in your rotor manual, unless the protocol specifies r avg or r min.
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