ABOUT US
About EasyTireSize
Accurate Tire Size Calculator for Drivers, Mechanics & Enthusiasts
EasyTireSize helps you calculate, compare, and analyse tire, wheel, and offset dimensions in seconds — so you can pick a size that fits and stays safe.
Tire Size Calculator
Current
215/50 R17
New
225/45 R18
Comparison Result
+12.9 mm
Our Mission
Accurate
Calculations follow standard formulas — detailed, complete, trustworthy.
Fast
Instant results, no sign-up, 100% free.
Reliable
Engineering-grade data to help reduce mistakes.
WHY EASYTIRESIZE
Why EasyTireSize?
We designed every tool around what drivers actually need — for beginners and professionals alike.
Contact Us
Suggest a new feature
Got an idea for us to build? Tell us — we read every message and consider it for future development.
Frequently Asked Questions (FAQ)
How accurate are the results?
Calculations use standard tire geometry formulas and are highly accurate for comparison. Real tires can vary slightly by brand and model.
Why don't the values match another website?
Different sites round differently or use slightly different formulas. We show more decimal places and follow standard geometry.
Where does the data come from?
Dimensions are derived from the tire size code (width / aspect ratio / rim) using standard formulas — no proprietary database required.
Is the website free?
Yes. Every tool is completely free with no sign-up and no usage limits.
Can I use it for any type of vehicle?
Yes — cars, pickups, SUVs, and motorcycles. Just enter the tire size printed on the sidewall.
Is there a mobile app?
Not yet, but the site is fully mobile-friendly and works great in any browser. A dedicated app is on our roadmap.