Disclaimer

Estimates, not guarantees

Every calculator on Sidewall Math produces an estimate from the numbers you enter and the formula shown on its page. Real results depend on measurement accuracy, product strength and conditions we cannot see. Always follow the product label or official rules where they differ from our estimate.

Fitment and safety

Our calculators compute dimensions from size codes. They do not confirm that a tire fits or is approved for your vehicle. Always check the vehicle's Tire and Loading Information placard and owner's manual, and have a qualified tire professional confirm clearance, load capacity, speed rating and inflation pressure before changing sizes. A different overall diameter can affect speedometer readings and systems such as ABS and stability control.

Independence

Sidewall Math is independent. We are not affiliated with or endorsed by any manufacturer, retailer, agency or organization we mention or link to. Product and company names are used only to identify them and belong to their owners.

Advertising

We plan to show ads in the future. No ads are shown today.

Affiliate links

Some guides contain a small number of clearly marked links to Amazon search results. As an Amazon Associate I earn from qualifying purchases. See our affiliate disclosure.