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	0.4	0.8	1.1	1.6	2.0
200	0.9	1.6	2.3	3.1	4.0
300	1.3	2.4	3.4	4.7	6.0
400	1.8	3.2	4.6	6.3	8.0
500	2.2	4.1	5.7	7.8	10.0
600	2.6	4.9	6.9	9.4	12.0
700	3.1	5.7	8.0	11.0	14.0
800	3.5	6.5	9.2	12.5	16.0
900	3.9	7.3	10.3	14.1	18.0
1000	4.4	8.1	11.5	15.6	20.0
1100	4.8	8.9	12.6	17.2	22.1
1200	5.3	9.7	13.8	18.8	24.1
1300	5.7	10.5	14.9	20.3	26.1
1400	6.1	11.4	16.1	21.9	28.1
1500	6.6	12.2	17.2	23.5	30.1
1600	7.0	13.0	18.4	25.0	32.1
1700	7.5	13.8	19.5	26.6	34.1
1800	7.9	14.6	20.7	28.2	36.1
1900	8.3	15.4	21.8	29.7	38.1
2000	8.8	16.2	23.0	31.3	40.1
2100	9.2	17.0	24.1	32.9	42.1
2200	9.6	17.9	25.3	34.4	44.1
2300	10.1	18.7	26.4	36.0	46.1
2400	10.5	19.5	27.6	37.5	48.1
2500	11.0	20.3	28.7	39.1	50.1
2600	11.4	21.1	29.9	40.7	52.1
2700	11.8	21.9	31.0	42.2	54.1
2800	12.3	22.7	32.2	43.8	56.1
2900	12.7	23.5	33.3	45.4	58.1
3000	13.2	24.3	34.5	46.9	60.1
3100	13.6	25.2	35.6	48.5	62.1
3200	14.0	26.0	36.8	50.1	64.2
3300	14.5	26.8	37.9	51.6	66.2
3400	14.9	27.6	39.1	53.2	68.2
3500	15.3	28.4	40.2	54.8	70.2
3600	15.8	29.2	41.4	56.3	72.2
3700	16.2	30.0	42.5	57.9	74.2
3800	16.7	30.8	43.7	59.5	76.2
3900	17.1	31.6	44.8	61.0	78.2
4000	17.5	32.5	46.0	62.6	80.2
4100	18.0	33.3	47.1	64.1	82.2
4200	18.4	34.1	48.2	65.7	84.2
4300	18.8	34.9	49.4	67.3	86.2
4400	19.3	35.7	50.5	68.8	88.2
4500	19.7	36.5	51.7	70.4	90.2
4600	20.2	37.3	52.8	72.0	92.2
4700	20.6	38.1	54.0	73.5	94.2
4800	21.0	39.0	55.1	75.1	96.2
4900	21.5	39.8	56.3	76.7	98.2
5000	21.9	40.6	57.4	78.2	100.2
5100	22.4	41.4	58.6	79.8	102.2
5200	22.8	42.2	59.7	81.4	104.2
5300	23.2	43.0	60.9	82.9	106.2
5400	23.7	43.8	62.0	84.5	108.3
5500	24.1	44.6	63.2	86.0	110.3
5600	24.5	45.4	64.3	87.6	112.3
5700	25.0	46.3	65.5	89.2	114.3
5800	25.4	47.1	66.6	90.7	116.3
5900	25.9	47.9	67.8	92.3	118.3
6000	26.3	48.7	68.9	93.9	120.3
6100	26.7	49.5	70.1	95.4	122.3
6200	27.2	50.3	71.2	97.0	124.3
6300	27.6	51.1	72.4	98.6	126.3
6400	28.1	51.9	73.5	100.1	128.3
6500 redline	28.5	52.7	74.7	101.7	130.3

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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