Tire Size Calculator
Calculate tire dimensions and find alternatives
Tire width in millimeters (145–355)
Sidewall height as percentage of width (30–80)
Wheel rim diameter in inches (12–24)
Enter tire size values to calculate dimensions.
Always consult your vehicle manufacturer's specifications and a tire professional before making tire changes.
Guide & Information
How to use this calculator
How to use
To calculate tire dimensions, follow these steps:
- Enter tire width — input the width in millimeters (e.g., 225)
- Enter aspect ratio — input the aspect ratio as a percentage (e.g., 50)
- Enter wheel diameter — input the wheel diameter in inches (e.g., 17)
- Click Calculate — get detailed tire dimensions and compatible alternatives
Pro Tips:
- You can find your tire size on the sidewall of your current tires
- Aim for less than 3% diameter difference when choosing alternative tires
- Check your vehicle's door jamb for recommended tire sizes