With regard to the centrifugation of biological samples.
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The process is a little complicated. But it's very accurate. Conversion as follows:
G force refers to Relative Centrifugal Force (RCF). RCF is positively related with the rotor radius and the rotation speed of the centrifuge. The g force rpm conversion formula is as follows:
RCF = 1.118 * 10-2 * r * (rpm)2
Where:
RCF: Relative Centrifuge Force, in "g"
r : Rotor radius, in "cm"
rpm: Rotation speed, rotations per minute, in "rpm.
On this site there are all sorts of rotor :
http://www.endmemo.com/bio/grpm.php