Tire Size Decoder & Dimensions Calculator
Decode markings like 225/50R17 98V XL, explain load and speed ratings, and calculate theoretical unloaded tire dimensions.
Open tire size decoder
Tire Tools & Consumer Calculators
Consumer tire reference tools with clear calculations and plain-English limitations.
Quick Summary
Treadsley consumer tools are free tire calculators and reference tools for personal, non-commercial, informational, and educational use.
These tools help users understand tire sizing, tread depth, pressure, distance, measurement averages, wear-rate estimates, and related tire concepts. They do not determine safety, legality, roadworthiness, or commercial testing results.
On mobile, this page also acts as the main tools directory because the top navigation intentionally stays simple.
Tire Size Comparison Tool
Compare theoretical unloaded diameter, width, revolutions per mile, and speedometer difference.
Open tire comparisonTread Depth Converter
Convert tread depth between 32nds of an inch and millimeters.
Open tread converterPressure Converter
Convert tire pressure between PSI, kPa, and bar.
Open pressure converterMiles / Kilometers Converter
Convert distance between miles and kilometers.
Open distance converterTire Measurement Averaging Tool
Average multiple tread depth measurements by groove and position to create a cleaner current average tread depth value.
Open averaging toolTire Age Checker
Decode a tire DOT date code, estimate when the tire was made, identify the plant when available, and create a shareable result.
Open tire age checkerTire DOT Plant Lookup
Look up tire DOT plant codes, old DOT codes, manufacturers, and plant locations using NHTSA-based reference data.
Open DOT plant lookupTire Wear Rate Calculator
Estimate tread loss, wear rate, remaining tread life, and projected mileage from tread depth measurements.
Open wear calculatorMulti-Tire Wear Rate Report
Create a multi-tire tread wear report for 2, 4, 6, 8, or 10 tires with vehicle details, tire details, PSI at measurement, and printable report output.
Open multi-tire reportFeature Request
Suggest a tool, correction, or reference feature for Treadsley.
Request a featureTire Learning Guides
Read plain-English reference pages about tread depth measurement, tire sizing, diameter, speedometer difference, revolutions per mile, and UTQG.
Open learning guidesUse the Tools with Context
Tire Size Tools
Decode one tire size first, then compare two sizes when you want to understand theoretical dimensional changes.
Tire Wear Tools
Measure tread depth consistently, average multiple readings when appropriate, then use wear tools as reference-only calculations.
Ratings and Markings
Use DOT, UTQG, size, load, and speed-rating education to understand what sidewall markings can and cannot tell you.
Consumer Tools FAQ
Can Treadsley consumer tools determine if a tire is safe or legal?
No. Treadsley consumer tools do not determine legality, safety, roadworthiness, fitment, inspection status, or serviceability.
Can tool outputs be used commercially?
No. Consumer tool outputs are provided for personal, non-commercial, informational, and educational use only unless Treadsley Holdings LLC gives prior written permission.
Where should I start if I do not understand a tire measurement?
Start with the Learning Center, then use the related tools after you understand the measurement or concept.