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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:
//

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  6 
0  0.0   0.0   0.0   0.0   0.0   0.0    
100  0.6   1.1   1.6   2.2   3.0   3.8    
200  1.3   2.1   3.3   4.4   5.9   7.5    
300  1.9   3.2   4.9   6.6   8.9   11.3    
400  2.5   4.3   6.6   8.8   11.9   15.1    
500  3.1   5.3   8.2   11.0   14.8   18.8    
600  3.8   6.4   9.9   13.2   17.8   22.6    
700  4.4   7.5   11.5   15.3   20.8   26.3    
800  5.0   8.5   13.2   17.5   23.7   30.1    
900  5.6   9.6   14.8   19.7   26.7   33.9    
1000  6.3   10.7   16.5   21.9   29.7   37.6    
1100  6.9   11.8   18.1   24.1   32.6   41.4    
1200  7.5   12.8   19.8   26.3   35.6   45.2    
1300  8.2   13.9   21.4   28.5   38.6   48.9    
1400  8.8   15.0   23.1   30.7   41.5   52.7    
1500  9.4   16.0   24.7   32.9   44.5   56.5    
1600  10.0   17.1   26.4   35.1   47.5   60.2    
1700  10.7   18.2   28.0   37.3   50.4   64.0    
1800  11.3   19.2   29.7   39.5   53.4   67.7    
1900  11.9   20.3   31.3   41.7   56.4   71.5    
2000  12.5   21.4   33.0   43.9   59.3   75.3    
2100  13.2   22.4   34.6   46.0   62.3   79.0    
2200  13.8   23.5   36.3   48.2   65.3   82.8    
2300  14.4   24.6   37.9   50.4   68.2   86.6    
2400  15.1   25.6   39.6   52.6   71.2   90.3    
2500  15.7   26.7   41.2   54.8   74.2   94.1    
2600  16.3   27.8   42.9   57.0   77.1   97.9    
2700  16.9   28.8   44.5   59.2   80.1   101.6    
2800  17.6   29.9   46.1   61.4   83.1   105.4    
2900  18.2   31.0   47.8   63.6   86.0   109.1    
3000  18.8   32.1   49.4   65.8   89.0   112.9    
3100  19.4   33.1   51.1   68.0   92.0   116.7    
3200  20.1   34.2   52.7   70.2   94.9   120.4    
3300  20.7   35.3   54.4   72.4   97.9   124.2    
3400  21.3   36.3   56.0   74.6   100.9   128.0    
3500  22.0   37.4   57.7   76.7   103.8   131.7    
3600  22.6   38.5   59.3   78.9   106.8   135.5    
3700  23.2   39.5   61.0   81.1   109.8   139.3    
3800  23.8   40.6   62.6   83.3   112.7   143.0    
3900  24.5   41.7   64.3   85.5   115.7   146.8    
4000  25.1   42.7   65.9   87.7   118.7   150.5    
4100  25.7   43.8   67.6   89.9   121.6   154.3    
4200  26.3   44.9   69.2   92.1   124.6   158.1    
4300  27.0   45.9   70.9   94.3   127.6   161.8    
4400  27.6   47.0   72.5   96.5   130.5   165.6    
4500  28.2   48.1   74.2   98.7   133.5   169.4    
4600  28.9   49.2   75.8   100.9   136.5   173.1    
4700  29.5   50.2   77.5   103.1   139.4   176.9    
4800  30.1   51.3   79.1   105.2   142.4   180.7    
4900  30.7   52.4   80.8   107.4   145.4   184.4    
5000  31.4   53.4   82.4   109.6   148.3   188.2    
5100  32.0   54.5   84.1   111.8   151.3   191.9    
5200  32.6   55.6   85.7   114.0   154.3   195.7    
5300  33.2   56.6   87.3   116.2   157.2   199.5    
5400  33.9   57.7   89.0   118.4   160.2   203.2    
5500  34.5   58.8   90.6   120.6   163.2   207.0    
5600  35.1   59.8   92.3   122.8   166.1   210.8    
5700  35.8   60.9   93.9   125.0   169.1   214.5    
5800  36.4   62.0   95.6   127.2   172.1   218.3    
5900  37.0   63.0   97.2   129.4   175.0   222.1    
6000  37.6   64.1   98.9   131.6   178.0   225.8    
6100  38.3   65.2   100.5   133.8   181.0   229.6    
6200  38.9   66.2   102.2   135.9   183.9   233.3    
6300  39.5   67.3   103.8   138.1   186.9   237.1    
6400  40.1   68.4   105.5   140.3   189.9   240.9    
6500
redline
40.8   69.5   107.1   142.5   192.8   244.6    

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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