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Engine RPM (Revolutions Per Minute) is the number of times your engine completes one full rotation every minute. Higher RPM values are associated with higher power output and speed.
The Gear Ratio represents the ratio between the rotation of the engine crankshaft and the drive wheel. A higher gear ratio leads to faster acceleration but limits the vehicle's top speed.
The Final Drive Ratio is the ratio between the number of rotations of the driveshaft and the rotation of the wheels. A higher final drive ratio improves acceleration, while a lower ratio allows for higher speeds.
The Tire Diameter is the total diameter of your tire measured in inches. Larger tires cover more distance per rotation, resulting in higher speeds for the same RPM.
Our Gear Ratio and Speed Calculator is designed to help you determine the speed of your vehicle based on various inputs like engine RPM, gear ratio, final drive ratio, and tire diameter. This is especially useful for car enthusiasts, mechanics, and racers who want to fine-tune their vehicle’s performance.
Enter the required values into the calculator, and it will provide your speed in both miles per hour (MPH) and kilometers per hour (KMH). The calculator considers the size of the tires, the gear and final drive ratios, and how fast the engine is spinning (RPM) to calculate the speed.
Simply enter the engine RPM (revolutions per minute), gear ratio, final drive ratio, and tire diameter in inches into the calculator. The formula behind the scenes will calculate your vehicle’s speed in both miles per hour (MPH) and kilometers per hour (KMH). The formula takes into account the tire circumference and adjusts for gear and drive ratios to provide an accurate estimate.
Understanding your vehicle's gear ratio is essential for optimizing performance. Gear ratios directly affect your car's acceleration and top speed. A higher gear ratio can increase acceleration but reduce top speed, while a lower gear ratio can boost speed at the cost of acceleration.
The speed is calculated using this formula:
Speed (MPH) = (RPM × Tire Circumference) / (Gear Ratio × Final Drive) × (60 / 63360)
To convert the speed to kilometers per hour (KMH), we multiply the result by 1.60934.