Convert g to RCF Centrifuge Calculator

Plan centrifuge runs with radius-based precision today. Switch units compare outputs and study plotted trends. Use clean forms exports examples formulas FAQs and instructions.

Calculator Form

Enter the rotor radius, choose a conversion mode, and generate lab-ready values, exports, and a trend graph.

Example Data Table

These sample rows show how radius and RPM influence the relative centrifugal force.

Example Radius (cm) RPM Estimated RCF (×g) Use Case
Tube Spin A 8.5 3,000 855.27 Light sedimentation
Tube Spin B 10.0 5,000 2,795.00 Routine clarification
Tube Spin C 12.5 8,000 8,944.00 Faster pellet formation
Tube Spin D 15.2 12,000 24,470.78 High-force separation

Formula Used

Main RCF equation:
RCF = 1.118 × 10-5 × r × RPM2
Rearranged for RPM:
RPM = √(RCF ÷ (1.118 × 10-5 × r))

Where:

  • RCF is the relative centrifugal force, often reported as ×g.
  • r is the rotor radius in centimeters, measured from rotor center to sample midpoint.
  • RPM is revolutions per minute.

The calculator also derives angular velocity, rotor tip speed, and time per revolution for a more complete centrifuge performance view.

How to Use This Calculator

  1. Enter a run label to identify your calculation.
  2. Select whether you want to convert RPM to RCF or RCF to RPM.
  3. Type the rotor radius and choose the correct unit.
  4. Enter either the input RPM or the target RCF, depending on the selected mode.
  5. Set the graph range to study how force changes across a speed band.
  6. Choose the number of decimal places you want in the output.
  7. Press Calculate Now and review the result section above the form.
  8. Use the CSV and PDF buttons to export the calculation summary.

Frequently Asked Questions

1) Is RCF the same as g-force in centrifugation?

Yes. In centrifuge work, RCF is usually written as multiples of earth gravity, shown as ×g. That is why many lab instructions say “spin at 5,000 g” when they mean a relative centrifugal force of 5,000.

2) Why does rotor radius matter so much?

RCF depends on both speed and radius. Two centrifuges at the same RPM can produce different forces if their rotor radii differ. Using radius avoids under-spinning or over-spinning samples during sensitive separation work.

3) Should I use the tube bottom or tube midpoint for radius?

Most protocols use the distance from rotor center to the sample midpoint. Some manufacturers specify maximum radius or bottom radius instead. Always match the protocol or instrument guidance used in your lab.

4) When should I convert RCF back to RPM?

Convert RCF to RPM when a protocol gives force values but your centrifuge control panel only accepts RPM. This helps you set the machine correctly for the rotor size actually installed.

5) Can I compare two centrifuges with this tool?

Yes. Run the same target RCF using different radii, or compare the RCF generated by identical RPM settings. This is useful when moving a procedure between bench-top and floor centrifuges.

6) Why does the graph curve upward quickly?

RCF increases with the square of RPM. That means force does not rise in a straight line. Small speed increases at high RPM can create much larger force jumps than expected.

7) What export data is included?

The export buttons save the key inputs and outputs shown in the result table. That includes radius, unit, calculated RPM, calculated RCF, angular velocity, tip speed, and time per revolution.

8) Is this suitable for laboratory planning?

It is useful for planning, checking settings, and documenting conversions. For regulated or high-risk workflows, always verify the final setup against your instrument manual, protocol, and internal quality process.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.