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Graph RPM vs. speed

This calculator will graph RPM vs. speed as you go through the gears. It will also show, for each gear, your total gearing in Revolutions Per Foot (RPF). RPF takes everything into account, from the crankshaft to the tires on the road. It tells you how many revolutions the crankshaft turns to move your car one foot.

If your tranny is not listed in the selection list, just enter its gear ratios. Some transmissions come with a variety of gear ratio sets, which is why they may not be listed here.

If you have an automatic, be sure to check the torque converter slip.