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Gear Ratio Calculator >>

2013 Mazda Miata MX5 5 speed manual Gear Ratios Calculator, MPH, Top Speed

 


This calculator outputs the how fast the Mazda Miata MX5 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 2.97 4.94 7.01 0.93 11.45 0 0 0
600 3.57 5.92 8.41 1.12 13.74 0 0 0
700 4.16 6.91 9.81 1.3 16.03 0 0 0
800 4.75 7.9 11.21 1.49 18.32 0 0 0
900 5.35 8.88 12.61 1.68 20.61 0 0 0
1000 5.94 9.87 14.01 1.86 22.9 0 0 0
1100 6.54 10.86 15.41 2.05 25.19 0 0 0
1200 7.13 11.85 16.82 2.24 27.48 0 0 0
1300 7.73 12.83 18.22 2.42 29.76 0 0 0
1400 8.32 13.82 19.62 2.61 32.05 0 0 0
1500 8.91 14.81 21.02 2.8 34.34 0 0 0
1600 9.51 15.79 22.42 2.98 36.63 0 0 0
1700 10.1 16.78 23.82 3.17 38.92 0 0 0
1800 10.7 17.77 25.22 3.35 41.21 0 0 0
1900 11.29 18.76 26.62 3.54 43.5 0 0 0
2000 11.89 19.74 28.03 3.73 45.79 0 0 0
2100 12.48 20.73 29.43 3.91 48.08 0 0 0
2200 13.07 21.72 30.83 4.1 50.37 0 0 0
2300 13.67 22.7 32.23 4.29 52.66 0 0 0
2400 14.26 23.69 33.63 4.47 54.95 0 0 0
2500 14.86 24.68 35.03 4.66 57.24 0 0 0
2600 15.45 25.67 36.43 4.85 59.53 0 0 0
2700 16.05 26.65 37.84 5.03 61.82 0 0 0
2800 16.64 27.64 39.24 5.22 64.11 0 0 0
2900 17.23 28.63 40.64 5.4 66.4 0 0 0
3000 17.83 29.61 42.04 5.59 68.69 0 0 0
3100 18.42 30.6 43.44 5.78 70.98 0 0 0
3200 19.02 31.59 44.84 5.96 73.27 0 0 0
3300 19.61 32.58 46.24 6.15 75.56 0 0 0
3400 20.21 33.56 47.64 6.34 77.85 0 0 0
3500 20.8 34.55 49.05 6.52 80.14 0 0 0
3600 21.39 35.54 50.45 6.71 82.43 0 0 0
3700 21.99 36.52 51.85 6.9 84.71 0 0 0
3800 22.58 37.51 53.25 7.08 87 0 0 0
3900 23.18 38.5 54.65 7.27 89.29 0 0 0
4000 23.77 39.49 56.05 7.45 91.58 0 0 0
4100 24.37 40.47 57.45 7.64 93.87 0 0 0
4200 24.96 41.46 58.85 7.83 96.16 0 0 0
4300 25.55 42.45 60.26 8.01 98.45 0 0 0
4400 26.15 43.43 61.66 8.2 100.74 0 0 0
4500 26.74 44.42 63.06 8.39 103.03 0 0 0
4600 27.34 45.41 64.46 8.57 105.32 0 0 0
4700 27.93 46.4 65.86 8.76 107.61 0 0 0
4800 28.53 47.38 67.26 8.95 109.9 0 0 0
4900 29.12 48.37 68.66 9.13 112.19 0 0 0
5000 29.72 49.36 70.06 9.32 114.48 0 0 0
5100 30.31 50.34 71.47 9.51 116.77 0 0 0
5200 30.9 51.33 72.87 9.69 119.06 0 0 0
5300 31.5 52.32 74.27 9.88 121.35 0 0 0
5400 32.09 53.31 75.67 10.06 123.64 0 0 0
5500 32.69 54.29 77.07 10.25 125.93 0 0 0
5600 33.28 55.28 78.47 10.44 128.22 0 0 0
5700 33.88 56.27 79.87 10.62 130.51 0 0 0
5800 34.47 57.25 81.28 10.81 132.8 0 0 0
5900 35.06 58.24 82.68 11 135.09 0 0 0
6000 35.66 59.23 84.08 11.18 137.38 0 0 0
6100 36.25 60.22 85.48 11.37 139.67 0 0 0
6200 36.85 61.2 86.88 11.56 141.95 0 0 0
6300 37.44 62.19 88.28 11.74 144.24 0 0 0
6400 38.04 63.18 89.68 11.93 146.53 0 0 0
6500 38.63 64.16 91.08 12.11 148.82 0 0 0
6600 39.22 65.15 92.49 12.3 151.11 0 0 0
6700 39.82 66.14 93.89 12.49 153.4 0 0 0
6800 40.41 67.13 95.29 12.67 155.69 0 0 0
6900 41.01 68.11 96.69 12.86 157.98 0 0 0
7000 41.6 69.1 98.09 13.05 160.27 0 0 0
7100 42.2 70.09 99.49 13.23 162.56 0 0 0
7200 42.79 71.07 100.89 13.42 164.85 0 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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