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Gear Ratio Calculator >>

2013 Subaru BRZ 6 speed manual Gear Ratios Calculator, MPH, Top Speed

 


This calculator outputs the how fast the Subaru BRZ can go in each gear as calculated by the gear ratios, engine redline and tire size.
The ultimate top speed may be limted by the power, drag and aerodynamics of each individual car.

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Tire Size
(345/30/20)
/ -
OR
Tire Diameter
(inches)
 
Final Drive Ratio
Redline (RPM)
1st Gear
2nd Gear
3rd Gear
4th Gear
5th Gear
6th Gear
7th Gear
8th Gear

RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 7th Gear 8th Gear
500 2.46 4.08 5.8 7.38 8.93 11.6 0 0
600 2.95 4.89 6.96 8.86 10.72 13.92 0 0
700 3.44 5.71 8.12 10.33 12.5 16.24 0 0
800 3.94 6.53 9.28 11.81 14.29 18.56 0 0
900 4.43 7.34 10.44 13.29 16.08 20.88 0 0
1000 4.92 8.16 11.6 14.76 17.86 23.2 0 0
1100 5.41 8.97 12.76 16.24 19.65 25.52 0 0
1200 5.91 9.79 13.92 17.72 21.44 27.84 0 0
1300 6.4 10.6 15.08 19.19 23.22 30.16 0 0
1400 6.89 11.42 16.24 20.67 25.01 32.48 0 0
1500 7.38 12.23 17.4 22.14 26.79 34.8 0 0
1600 7.87 13.05 18.56 23.62 28.58 37.12 0 0
1700 8.37 13.87 19.72 25.1 30.37 39.44 0 0
1800 8.86 14.68 20.88 26.57 32.15 41.76 0 0
1900 9.35 15.5 22.04 28.05 33.94 44.08 0 0
2000 9.84 16.31 23.2 29.53 35.73 46.4 0 0
2100 10.33 17.13 24.36 31 37.51 48.72 0 0
2200 10.83 17.94 25.52 32.48 39.3 51.04 0 0
2300 11.32 18.76 26.68 33.95 41.09 53.36 0 0
2400 11.81 19.58 27.84 35.43 42.87 55.68 0 0
2500 12.3 20.39 29 36.91 44.66 58 0 0
2600 12.79 21.21 30.16 38.38 46.44 60.32 0 0
2700 13.29 22.02 31.32 39.86 48.23 62.64 0 0
2800 13.78 22.84 32.48 41.34 50.02 64.96 0 0
2900 14.27 23.65 33.64 42.81 51.8 67.28 0 0
3000 14.76 24.47 34.8 44.29 53.59 69.6 0 0
3100 15.25 25.29 35.96 45.76 55.38 71.92 0 0
3200 15.75 26.1 37.12 47.24 57.16 74.24 0 0
3300 16.24 26.92 38.28 48.72 58.95 76.56 0 0
3400 16.73 27.73 39.44 50.19 60.73 78.88 0 0
3500 17.22 28.55 40.6 51.67 62.52 81.2 0 0
3600 17.72 29.36 41.76 53.15 64.31 83.52 0 0
3700 18.21 30.18 42.92 54.62 66.09 85.84 0 0
3800 18.7 31 44.08 56.1 67.88 88.16 0 0
3900 19.19 31.81 45.24 57.58 69.67 90.48 0 0
4000 19.68 32.63 46.4 59.05 71.45 92.8 0 0
4100 20.18 33.44 47.56 60.53 73.24 95.12 0 0
4200 20.67 34.26 48.72 62 75.03 97.44 0 0
4300 21.16 35.07 49.88 63.48 76.81 99.75 0 0
4400 21.65 35.89 51.04 64.96 78.6 102.07 0 0
4500 22.14 36.7 52.2 66.43 80.38 104.39 0 0
4600 22.64 37.52 53.36 67.91 82.17 106.71 0 0
4700 23.13 38.34 54.52 69.39 83.96 109.03 0 0
4800 23.62 39.15 55.68 70.86 85.74 111.35 0 0
4900 24.11 39.97 56.84 72.34 87.53 113.67 0 0
5000 24.6 40.78 58 73.81 89.32 115.99 0 0
5100 25.1 41.6 59.16 75.29 91.1 118.31 0 0
5200 25.59 42.41 60.32 76.77 92.89 120.63 0 0
5300 26.08 43.23 61.48 78.24 94.67 122.95 0 0
5400 26.57 44.05 62.64 79.72 96.46 125.27 0 0
5500 27.07 44.86 63.8 81.2 98.25 127.59 0 0
5600 27.56 45.68 64.96 82.67 100.03 129.91 0 0
5700 28.05 46.49 66.12 84.15 101.82 132.23 0 0
5800 28.54 47.31 67.28 85.62 103.61 134.55 0 0
5900 29.03 48.12 68.44 87.1 105.39 136.87 0 0
6000 29.53 48.94 69.6 88.58 107.18 139.19 0 0
6100 30.02 49.76 70.76 90.05 108.96 141.51 0 0
6200 30.51 50.57 71.92 91.53 110.75 143.83 0 0
6300 31 51.39 73.08 93.01 112.54 146.15 0 0
6400 31.49 52.2 74.24 94.48 114.32 148.47 0 0
6500 31.99 53.02 75.4 95.96 116.11 150.79 0 0
6600 32.48 53.83 76.56 97.44 117.9 153.11 0 0
6700 32.97 54.65 77.72 98.91 119.68 155.43 0 0
6800 33.46 55.47 78.88 100.39 121.47 157.75 0 0
6900 33.95 56.28 80.04 101.86 123.26 160.07 0 0
7000 34.45 57.1 81.2 103.34 125.04 162.39 0 0
7100 34.94 57.91 82.36 104.82 126.83 164.71 0 0
7200 35.43 58.73 83.52 106.29 128.61 167.03 0 0
7300 35.92 59.54 84.68 107.77 130.4 169.35 0 0
7400 36.42 60.36 85.84 109.25 132.19 171.67 0 0
7500 36.91 61.17 87 110.72 133.97 173.99 0 0
RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 7th Gear 8th Gear





Some additional information on how these are calculated:

When D is the diameter of the tire, the car moves forward a distance πD with each revolution of the tire. If there are F revolutions per unit of time, it moves forward at a speed of πD´F per unit of time. If D is in inches and F is in revolutions per minute (rpm), the above result will be in inches per minute. There are 63,360 inches in a mile and 60 minutes in an hour, so one inch per minute equals 60/63360 miles per hour or 1/1056 mph. So we have the following formula:

V(mph) = D(in) ´ F(rpm) ´ (π/1056)

In the automotive industry, the coefficient 1056/π is usually taken to be equal to 336 (exactly it is 336.1352398...) and the formula corresponding to the above is:

(mph)(gear ratio)(336) = (tire diameter in inches)(rpm)

With the above numerical approximation, both formulas are identical if we consider that (rpm)/(gear ratio) is the rate of rotation of the tires. So the "gear ratio" as the number of rotations of the driveshaft for each turn of the tire. This ratio is normally more than 1, except in overdrive gear. So, calling R the "gear ratio", your final answer is:

V(mph) = D(in) ´ F(rpm) ´ (π/1056) / R

or, approximately: V = (D ´ F) / (336 ´ R)

where V is the velocity (in mph), D the tire diameter (in inches), F the engine rpm, and R the gear ratio.

 


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