Gear Ratio RPM
RPM_out = RPM_in × (T_in / T_out)
How to Use This Calculator
Enter input RPM, driver gear teeth (T_in), and driven gear teeth (T_out). The output RPM is inversely proportional to gear ratio.
Formula
RPM_out = RPM_in × (T_in / T_out)
Frequently Asked Questions
What about compound gear trains?
Multiply stage ratios: overall ratio = Π(T_in,i / T_out,i). Apply the same formula with overall ratio.