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.

	1	2	3	4	5
0	0.0	0.0	0.0	0.0	0.0
100	0.5	0.9	1.3	1.9	2.6
200	1.0	1.7	2.7	3.8	5.2
300	1.4	2.6	4.0	5.7	7.8
400	1.9	3.4	5.4	7.6	10.4
500	2.4	4.3	6.7	9.4	13.0
600	2.9	5.1	8.0	11.3	15.6
700	3.3	6.0	9.4	13.2	18.2
800	3.8	6.8	10.7	15.1	20.8
900	4.3	7.7	12.0	17.0	23.4
1000	4.8	8.5	13.4	18.9	26.0
1100	5.2	9.4	14.7	20.8	28.6
1200	5.7	10.2	16.1	22.7	31.1
1300	6.2	11.1	17.4	24.6	33.7
1400	6.7	11.9	18.7	26.4	36.3
1500	7.1	12.8	20.1	28.3	38.9
1600	7.6	13.6	21.4	30.2	41.5
1700	8.1	14.5	22.7	32.1	44.1
1800	8.6	15.3	24.1	34.0	46.7
1900	9.1	16.2	25.4	35.9	49.3
2000	9.5	17.0	26.8	37.8	51.9
2100	10.0	17.9	28.1	39.7	54.5
2200	10.5	18.7	29.4	41.5	57.1
2300	11.0	19.6	30.8	43.4	59.7
2400	11.4	20.4	32.1	45.3	62.3
2500	11.9	21.3	33.5	47.2	64.9
2600	12.4	22.1	34.8	49.1	67.5
2700	12.9	23.0	36.1	51.0	70.1
2800	13.3	23.8	37.5	52.9	72.7
2900	13.8	24.7	38.8	54.8	75.3
3000	14.3	25.5	40.1	56.7	77.9
3100	14.8	26.4	41.5	58.5	80.5
3200	15.2	27.2	42.8	60.4	83.1
3300	15.7	28.1	44.2	62.3	85.7
3400	16.2	28.9	45.5	64.2	88.3
3500	16.7	29.8	46.8	66.1	90.9
3600	17.2	30.6	48.2	68.0	93.4
3700	17.6	31.5	49.5	69.9	96.0
3800	18.1	32.3	50.8	71.8	98.6
3900	18.6	33.2	52.2	73.7	101.2
4000	19.1	34.0	53.5	75.5	103.8
4100	19.5	34.9	54.9	77.4	106.4
4200	20.0	35.7	56.2	79.3	109.0
4300	20.5	36.6	57.5	81.2	111.6
4400	21.0	37.4	58.9	83.1	114.2
4500	21.4	38.3	60.2	85.0	116.8
4600	21.9	39.1	61.6	86.9	119.4
4700	22.4	40.0	62.9	88.8	122.0
4800	22.9	40.8	64.2	90.6	124.6
4900	23.4	41.7	65.6	92.5	127.2
5000	23.8	42.5	66.9	94.4	129.8
5100	24.3	43.4	68.2	96.3	132.4
5200	24.8	44.2	69.6	98.2	135.0
5300	25.3	45.1	70.9	100.1	137.6
5400	25.7	45.9	72.3	102.0	140.2
5500	26.2	46.8	73.6	103.9	142.8
5600	26.7	47.6	74.9	105.8	145.4
5700	27.2	48.5	76.3	107.6	148.0
5800	27.6	49.3	77.6	109.5	150.6
5900	28.1	50.2	78.9	111.4	153.2
6000	28.6	51.0	80.3	113.3	155.7
6100	29.1	51.9	81.6	115.2	158.3
6200	29.5	52.7	83.0	117.1	160.9
6300	30.0	53.6	84.3	119.0	163.5
6400	30.5	54.4	85.6	120.9	166.1
6500 redline	31.0	55.3	87.0	122.8	168.7

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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