1. What is the MPH Calculation?

The MPH (miles per hour) calculation determines vehicle speed based on engine RPM, tire diameter, and gear ratio. It's essential for automotive performance analysis and gear ratio optimization.

2. How Does the Calculator Work?

The calculator uses the MPH formula:

Where:

• \( RPM \) — Engine revolutions per minute
• \( Tire\_Diam\_ft \) — Tire diameter in feet
• \( \pi \) — Mathematical constant (3.1416)
• \( GR \) — Gear ratio
• 60 — Minutes to hours conversion
• 5280 — Feet to miles conversion

Explanation: The equation converts rotational speed to linear speed, accounting for gear reduction and tire circumference.

3. Importance of MPH Calculation

Details: Accurate speed calculation is crucial for vehicle performance tuning, gear selection, fuel efficiency analysis, and safety considerations.

4. Using the Calculator

Tips: Enter RPM (positive value), tire diameter in feet, and gear ratio. All values must be valid positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why convert tire diameter to feet?
A: The formula requires consistent units - feet for distance and hours for time to calculate miles per hour.

Q2: What is a typical gear ratio range?
A: Gear ratios typically range from 2.5:1 to 4.5:1 for final drive ratios, depending on vehicle type and purpose.

Q3: How do I measure tire diameter accurately?
A: Measure from ground to top of tire under load, or calculate from tire size markings (e.g., 225/45R17).

Q4: Does this account for tire slip or deformation?
A: No, this calculation assumes ideal conditions without tire slip or deformation under load.

Q5: Can this be used for different vehicle types?
A: Yes, the formula works for any wheeled vehicle including cars, trucks, motorcycles, and bicycles.