1. What is a Tire Pressure Calculator by Size?

Definition: This calculator estimates the optimal tire pressure based on base pressure, tire size factor, and vehicle load.

Purpose: It helps vehicle owners and mechanics determine proper tire inflation for safety and performance.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P \) — Recommended tire pressure (PSI)
• \( B \) — Base pressure (PSI)
• \( S \) — Tire size factor (width in mm)
• \( L \) — Vehicle load (kg)

Explanation: The base pressure is adjusted for tire size (wider tires need more pressure) and vehicle load (heavier loads need more pressure).

3. Importance of Proper Tire Pressure

Details: Correct tire pressure ensures optimal traction, fuel efficiency, tire longevity, and safety while driving.

4. Using the Calculator

Tips: Enter the base pressure (typically 30-35 PSI for passenger cars), tire width in mm (from tire sidewall), and vehicle load in kg. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Where do I find my tire size?
A: Look on the tire sidewall for numbers like "225/45R17" - the first number (225) is the width in mm.

Q2: What's a typical base pressure?
A: Most passenger cars use 30-35 PSI, but check your vehicle's door jamb or manual for manufacturer recommendations.

Q3: How does load affect tire pressure?
A: Heavier loads require higher pressure - about 0.05 PSI per kg of additional load.

Q4: Should I adjust for weather conditions?
A: Yes, tire pressure changes with temperature (1 PSI per 10°F). Check pressures when tires are cold.

Q5: Is this calculator suitable for all vehicles?
A: It works best for passenger vehicles. Trucks, RVs, and performance cars may need specialized calculations.