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Speed/RPM Calculator

This calculator will give you a table of your speed in mph per rpm in each gear.  The default is for the Impreza 2.5 RS.   Fill in your specs to get a custom table.  A factor of 0.965 was used to account for the reduced tire diameter caused by numerous factors (see below).  Every tire will be slightly different, so these numbers are purely estimates.  It's impossible to calculate a precise value.

Select a car from this list: or fill out the form below.
Tire Size:
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Final Drive Ratio (Axle Ratio of driven wheels):

Gear Ratios
1:
2:
3:
4:
5:
6:
7:

RPM Redline:

RPM Increment:

 

  1  2  3  4  5 
0  0.0   0.0   0.0   0.0   0.0      
500  3.2   3.8   3.6   10.6   15.6      
1000  6.3   7.6   7.2   21.2   31.2      
1500  9.5   11.5   10.8   31.9   46.9      
2000  12.7   15.3   14.4   42.5   62.5      
2500  15.9   19.1   18.0   53.1   78.1      
3000  19.0   22.9   21.6   63.7   93.7      
3500  22.2   26.7   25.2   74.3   109.3      
4000  25.4   30.6   28.8   85.0   125.0      
4500  28.5   34.4   32.4   95.6   140.6      
5000  31.7   38.2   36.0   106.2   156.2      
5500  34.9   42.0   39.6   116.8   171.8      
6000
redline
38.0   45.8   43.2   127.5   187.4      

Why isn't it perfectly accurate?

There are far too many factors that affect a car's velocity to be reasonably considered in this table.  Barometric pressure and altitude all contribute to a variable air pressure that affects the external pressure on the tire, reducing its size and reducing the vehicle's velocity.  The tire size is also affected by other factors like temperature, humidity, car weight, car weight distribution, weight shifting caused by acceleration, and rotational speed (centrifugal force).  Gravitational forces from the earth, moon, and sun also affect the pressure on the tire and its size.

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