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Automotive Caculators
Values Based On Educated Calculations

 

Calculate HP from Trap Speed

Vehicle weight in pounds (including driver)
lbs

Trap speed at end of 1/4 mi in m.p.h.
m.p.h.


You are making : HP at the rear wheels and HP at the flywheel*.
 

*Note:  Assuming a 18% drive train loss.

 

Calculate HP from ET

Vehicle weight in pounds (including driver)
lbs

ET in seconds
sec


You are making : HP at the rear wheels and HP at the flywheel*.
 

*Note:  Assuming a 18% drive train loss.

 

Calculate Tire Diameter
Tire width - Series - Wheel Diameter
Example 275 - 60 R 15
Tire Width
 Tire Series
 Wheel Diameter


Tire diameter in inches
 

 

 

Calculate mph for RPM range
Tire diameter
 Gear Ratio

This calculation assumes the car's transmission is in drive or 1:1 ratio, no overdrive. For Overdrive mutliply the overdrive ratio times the rear and gear ratio. Example a 5R110 transmission has an overdive ratio 0.7:1. For a 4.11 rear end multiply 4.11 x 0.7 = 2.877. Enter 2.877 as the number for the gear ratio to calculate speeds in overdive.
JavaScript must be enabled in your browser for the calculation to work.

1000 rpm

mph

3000 rpm

mph

1500 rpm

mph

3500 rpm

mph

2000 rpm

mph

4000 rpm

mph

2500 rpm

mph

4500 rpm

mph

 

 

Calculate Rear End Gear Ratio

Enter the tire diameter in inches, rpm's of the motor at a certain speed as indicated by your speedometer in mph. This calculation assumes the car's transmission is in drive or 1:1 ratio, no overdrive.
Tire Diameter (in)
 RPM
 Speed at RPM (mph)


Rear End Gear Ratio
 

 

Quick Tire Size Converter
P-Metric Style

Example: 215/75R15
/ R

Inch Style

Example: 31 x 10.50 x 15
x x
 
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