Centrifuge RPM and RCF
Centrifuge speed converted to g-force, or g-force back to rpm.
Example
You enter
- Rotor radius (mm) 85
- RPM (leave 0 to solve) 10000
You get
- Relative centrifugal force (x g) 9503
Checked against published worked examples from: Beckman Coulter.
Details, formula, and sources
ScopeRCF (g) = 1.118e-5 * r(cm) * RPM^2. Both directions. Bundled rotor radii.
Formula or tableRCF (g) = 1.118e-5 * r(cm) * RPM^2. Both directions: RPM = sqrt(RCF / (1.118e-5 * r_cm)).
Source and editionStandard centrifuge formula. First principles. Manufacturer rotor radii bundled in CENTRIFUGE_ROTORS (data/lab/centrifuge-rotors.json) with per-entry attribution.
Free accessManufacturer rotor charts (Eppendorf, Beckman Coulter, Thermo Fisher) free at the manufacturer's site.
What governsVerify protocol against your lab's SOP before pipetting. A miscalculated dilution can ruin a run or a sample.
API field namesrotor_radius_mm, rpm, rcf
- r convention rotor maximum radius (r_max) unless the user provides r_min for top-of-tube gEppendorf / Beckman convention