Gear Ratio Calculator

With Gear Ratio Calculator you can see the theoretical top speeds in all gears. You can change tire dimensions to calculate the effect on top speed and gearing. It will help you to find the best gear ratios for your racing car and to understand when it is the best time to change a gear.

Maximum Power RPM: Revolutions per minute when reaching
the top of the power curve.
Width Profile Wheel diameter
Tire Diameter [mm]:  OR 
Numbers of teeth Gear Ratio
Final Drive Ratio:  x   OR 
1st Gear Ratio:  x   OR 
2nd Gear Ratio:  x   OR 
3rd Gear Ratio:  x   OR 
4th Gear Ratio:  x   OR 
5th Gear Ratio:  x   OR 
6th Gear Ratio:  x   OR 
Speed in:




Save as image
Gear shift Difference after shifting RPM after shifting
from 1st Gear to 2nd Gear 2564 3936
from 2nd Gear to 3rd Gear 2101 4399
from 3rd Gear to 4th Gear 1649 4851
from 4th Gear to 5th Gear 2080 4420
mph / RPM 1000 2000 3000 4000 5000 6000 6500
1st Gear 7.9 15.8 23.7 31.6 39.5 47.4 51.4
2nd Gear 13 26.1 39.1 52.2 65.2 78.3 84.8
3rd Gear 19.3 38.6 57.8 77.1 96.4 115.7 125.3
4th Gear 25.8 51.7 77.5 103.3 129.2 155 167.9
5th Gear 38 76 114 152 190 228 247

This calculator is completely based on mathematical formulas to be useful to you. Try the Transmission Gear Ratio Calculator now.