G Force Calculator — RCF to RPM (2024)

FAQs

How to convert RCF to RPM? ›

g = rpm² x r x 1.118x10^-5

Note: g-force is sometimes called relative centrifugal force (rcf). These units are the same.

Revolutions Per Minute

For example, when revolving at 3,500 RPM, a large rotor with a radius of 15 cm will produce a maximum G-Force of 2,058 xg, while a small rotor with a radius of 5 cm will produce a maximum G-Force of 686 xg.

Values of RCF in units of times gravity (× g) for common microcentrifuge rotor radii appear in the following conversion table. As an example, centrifugation of a sample at 5,000 RPM in a microcentrifuge that has a rotor with a radius of 7 cm will deliver a centrifugal force of 1,957 × g.

Relative Centrifugal Force (RCF) or g-force (both are the same, RCF is expressed as units of gravity) is a measurement of the gravitational force that a sample is subject to. The force is generated from the spinning of the rotor which, in turn, exerts this force outward on the centrifuge tube.

It depends on your centrifuge. Measure the radius of your rotor in centimeters, then rpm would be square root of (g-number*8.95*10^4/radius (in cm)). Let say, radius of your rotor is 10 cm; then 300 x g is 1640 rpm.

A G-Force is actually a calculation of acceleration, not force. 1 g is an acceleration of 9.8 meters per second per second (m/s^2). To calculate the total G-Force on an object, you can just "add" up all the acceleration vectors to find the net acceleration.

If the speed, |v| , is constant but the path of the object is circular, with radius r , then the acceleration is |v|2/r | v | 2 / r and the g-force is (|v|2/r)/9.8 ( | v | 2 / r ) / 9.8 .

1G is the acceleration we feel due to the force of gravity. It's what keeps our feet firmly planted on the ground. Gravity is measured in metres per second squared, or m/s2. On Earth, the acceleration of gravity generally has a value of 9.806 m/s2 or 32.1740 f/s2.

g = (1.118 x 10^-5) x R x S²

Where g is the relative centrifugal force , R is the radius of the rotor in centimeteres and S is the speed of the centrifuge in revolutions per minute (RPM).

What is the difference between RPM and RCF? ›

However, these terminologies differ from each other. RPM indicates the speed at which the rotor is rotating. RCF is the term used to describe the amount of accelerative force applied to a sample in a centrifuge. RCF is measured in multiples of the standard acceleration due to gravity on the Earth's surface (x g).

RCF is equal to 1.12 times radius multiplied by RPM divided by 1000 squared(RCF = 1.12 × r (RPM/1000)²).

Dear Abdur, You may use the following equation: g = (1.118 × 10^-5) R S² where g is the relative centrifugal force, R is the radius of the rotor in centimeters, and S is the speed of the centrifuge in revolutions per minute.

Since 7000 mph does not include any velocity change there is no acceleration and thus no G's. One G is equal to an acceleration of 9.8 meters per second squared or 32 feet per second squared, depending on which units you use.

RCF, RPM and r are linked by the equation for calculating RCF. RCF = 11.2 × r (RPM/1000)² or RCF = 1.12 × 10^-5 (RPM)². This equation can be rearranged to calculate RPM from a given RCF. In this manual, instructions for centrifugation are given as spinning at a given RCF (g) for a certain length of time.

RCF is more precise than RPM because the rotor size might differ, and RCF will be different, while the revolutions per minute stay the same.

rpm is defined as revolution per minute, or rad/s, or (1047197xE-1 Hz). Or, using angular frequency, the NIST value is calculated: 1 rpm = 1/60 rev/s = 2π/60 rad/s = 0.1047 rad/s (matches the NIST table). In other words, the angular frequency (in rad/s) is 2 pi times greater than the frequency (in Hz).