Calculate Vehicle Speed

Vehicle Speed Formula:

\[ Speed = \frac{RPM \times Tire\ Circumference}{Gear\ Ratio \times 336} \]

Vehicle Speed:

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Vehicle Speed Formula?

The vehicle speed formula calculates the speed of a vehicle based on engine RPM, tire circumference, and gear ratio. It provides an accurate estimation of how fast a vehicle is moving under specific mechanical conditions.

2. How Does the Calculator Work?

The calculator uses the vehicle speed formula:

\[ Speed = \frac{RPM \times Tire\ Circumference}{Gear\ Ratio \times 336} \]

Where:

\( RPM \) — Engine revolutions per minute
\( Tire\ Circumference \) — Circumference of the tire in inches
\( Gear\ Ratio \) — Gear ratio of the transmission
\( 336 \) — Constant conversion factor

Explanation: The formula accounts for the relationship between engine rotation, tire size, and gear reduction to determine the actual vehicle speed.

3. Importance of Vehicle Speed Calculation

Details: Accurate vehicle speed calculation is crucial for performance tuning, gear ratio selection, fuel efficiency optimization, and ensuring proper vehicle operation within safe speed limits.

4. Using the Calculator

Tips: Enter RPM in revolutions per minute, tire circumference in inches, and gear ratio as a number. All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is 336 used in the formula?
A: The constant 336 is derived from unit conversions that transform rotational measurements into linear speed (miles per hour).

Q2: How do I measure tire circumference?
A: Tire circumference can be measured directly or calculated from tire size specifications. It represents the distance the vehicle travels with one complete tire rotation.

Q3: What affects the accuracy of this calculation?
A: Tire wear, inflation pressure, transmission slip, and actual vs theoretical gear ratios can affect the accuracy of the calculation.

Q4: Can this formula be used for any vehicle?
A: Yes, the formula works for any wheeled vehicle, though the constant may need adjustment for different measurement units.

Q5: How does gear ratio affect vehicle speed?
A: Higher gear ratios (numerically lower) generally result in higher vehicle speeds at the same RPM, while lower ratios provide more torque but lower top speed.