About TireCalc

TireCalc is a free collection of online tire calculators for drivers, enthusiasts, and mechanics. Our tools help you understand tire sizing, compare fitments, and decode tire specifications quickly and accurately.

Our Mission

To provide accurate, easy-to-use tire calculation tools that are completely free with no registration required.

Tools Available

• Tire Size Calculator — decode any tire size into diameter, circumference, and more
• Size Comparison — compare two tires side by side
• Speedometer Error — calculate how a tire change affects your speedometer
• Load Index Lookup — convert load index to weight capacity
• Tire Age Calculator — decode DOT date codes
• And more...