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Speed Calculator

To create your individual speed chart, select your tire size and click "calculate".






Wheel Size


Please enter the tire size of the rear axle: 

/ R  

Please select the ratios: 


Differential ratio

4th gear ratio

  a 4.12 0.89
  b 4.12 0.82
  c 3.88 0.89
  d 3.88 0.82
  e 3.44 0.93
  Which ratio above are you using 

Thanks to Custom Speed Parts for their help with the Speed Calculator.

Brea HP Calculator

Total Car Weight (with driver): 

E/T (quarter mile elapsed time): 

Trap Speed (MPH at end of quarter mile):