All Tire & Wheel Calculators & Comparison Tools
Browse 134 tire calculators, wheel fitment comparators, speedometer tools and unit converters. Find formulas and worked examples.
Choose a tire or wheel tool by name or category. Each page explains the inputs, formula and units, with a worked example and reference table.
Core Tire Dimensions(28)
Tire Size Comparison Calculator
Compare two tire sizes.
Multiple Tire Size Comparator
Compare several sizes together.
Tire Diameter Calculator
Estimate nominal overall diameter.
Tire Diameter Difference Calculator
Calculate absolute and percentage differences.
Tire Circumference Calculator
Estimate nominal circumference.
Tire Circumference Difference Calculator
Compare estimated rolling distances.
Tire Section Width Comparator
Compare nominal section widths.
Tire Sidewall Height Calculator
Calculate sidewall height from size markings.
Sidewall Height Difference Calculator
Compare sidewall height changes.
Tire Aspect Ratio Calculator
Derive aspect ratio from dimensions.
Tire Radius Calculator
Calculate nominal unloaded radius.
Rim Diameter Comparator
Compare required wheel diameters.
Tire Revolutions per Mile Calculator
Estimate rotations over one mile.
Tire Revolutions per Kilometer Calculator
Estimate rotations over one kilometer.
Published Revolutions Comparator
Compare manufacturer-listed rolling specifications.
Measured Tire Rollout Calculator
Calculate circumference from measured travel.
Nominal vs Published Dimensions Comparator
Compare estimates with manufacturer specifications.
Front-to-Rear Circumference Calculator
Calculate axle-to-axle circumference differences.
Combined Wheel and Tire Comparator
Compare dimensions, widths, and offsets.
Wheel Width Comparator
Compare rim width changes.
Approved Rim Width Checker
Compare wheels with published tire limits.
Measuring Rim Width Comparator
Compare manufacturer measurement conditions.
Rim-Dependent Section Width Estimator
Estimate width changes within approved ranges.
Tire Capacity Margin Calculator
Compare entered loads with applicable capacities.
New vs Worn Circumference Calculator
Compare approximate circumference changes.
Tire Replacement Projection Calculator
Extrapolate recorded tread wear.
Tire Specification Comparator
Compare exact models in a common size.
Tire Model Size Variant Comparator
Compare specifications across one model’s sizes.
Decoders & Converters(6)
Metric Tire Size Decoder
Explain width, aspect ratio, and rim diameter.
Flotation Tire Size Decoder
Explain inch-based truck tire dimensions.
Metric-to-Flotation Tire Converter
Express nominal dimensions in inches.
Flotation-to-Metric Tire Converter
Find approximate metric size equivalents.
Tire Dimension Unit Converter
Convert millimeters, inches, and centimeters.
Tire Size Input Validator
Check size notation and required fields.
Wheel Sizing & Conversion(9)
Equivalent Diameter Tire Finder
Find sizes near a target diameter.
Target Diameter Tire Calculator
Solve for nominal aspect ratio.
Diameter Tolerance Filter
Filter candidates using specified limits.
Same-Rim Alternative Size Finder
Compare alternatives on one rim diameter.
Plus-One Tire Calculator
Compare sizes using larger wheels.
Plus-Two Tire Calculator
Compare sizes using two-inch wheel increases.
Custom Plus-Sizing Calculator
Explore specified wheel diameter increases.
Minus-Sizing Calculator
Compare sizes using smaller wheels.
Winter Wheel Size Comparator
Compare proposed winter wheel packages.
Vehicle & Axle Fitment(7)
Stock vs Replacement Tire Comparator
Compare replacement dimensions with original specifications.
Passenger vs LT Tire Comparator
Compare dimensions and rated specifications.
Truck Tire Size Comparator
Compare metric and flotation truck sizes.
Spare Tire Size Comparator
Compare spare and road tire dimensions.
Staggered Tire Size Calculator
Compare front and rear sizes.
AWD Tire Matching Comparator
Compare measurements against vehicle-specific limits.
Dual Tire Specification Comparator
Compare published spacing and load requirements.
Speedometer & Distance(13)
Speedometer Error Calculator
Estimate speed changes after tire resizing.
Actual Speed Calculator
Estimate road speed from indicated speed.
Indicated Speed Calculator
Estimate displayed speed at a given road speed.
Speedometer Correction Factor Calculator
Calculate a tire-size correction multiplier.
Speedometer Correction Table Generator
Tabulate indicated and estimated actual speeds.
Odometer Error Calculator
Estimate distance recording differences.
Corrected Trip Distance Calculator
Adjust indicated distance for tire changes.
Corrected Fuel Economy Calculator
Adjust distance-based fuel economy readings.
Engine RPM at Speed Calculator
Combine tire size and drivetrain ratios.
Vehicle Speed at RPM Calculator
Estimate speed from RPM and gearing.
Shift Speed Comparator
Compare theoretical speeds across gears.
Tire Speed Rating Decoder
Explain speed rating designations.
Tire Speed Rating Comparator
Compare specified speed categories.
Gearing & Drivetrain(4)
Effective Gear Ratio Calculator
Calculate gearing changes from tire diameter.
Equivalent Axle Ratio Calculator
Find ratios preserving original effective gearing.
Wheel Torque Change Calculator
Model gearing and tire-radius effects.
Theoretical Tractive Force Calculator
Combine wheel torque and tire radius.
Clearance & Stance(8)
Nominal Ground Clearance Change Calculator
Estimate clearance changes from tire radius.
Loaded Radius Comparator
Compare manufacturer-specified loaded tire radii.
Wheel Arch Gap Change Calculator
Estimate static vertical gap changes.
Inner Tire Clearance Change Calculator
Estimate changes toward suspension components.
Outer Tire Position Calculator
Estimate tire movement toward the fender.
Inner Wheel Clearance Calculator
Estimate changes at the inner wheel edge.
Outer Wheel Position Calculator
Estimate changes at the outer wheel edge.
Target Wheel Position Calculator
Solve for a desired static position.
Wheel Geometry & Fitment(12)
Wheel Offset Calculator
Calculate wheel mounting offset.
Wheel Offset Difference Calculator
Compare old and new offsets.
Wheel Backspacing Calculator
Calculate backspacing using specified wheel dimensions.
Backspacing-to-Offset Converter
Convert mounting measurements.
Wheel Frontspacing Calculator
Calculate outward wheel projection.
Effective Offset with Spacer Calculator
Account for spacer thickness.
Spacer Position Change Calculator
Calculate inward and outward clearance changes.
Track Width Change Calculator
Estimate axle track changes.
Wheel Bolt Pattern Comparator
Compare bolt count and pitch diameter.
Wheel Center Bore Comparator
Compare hub and center bore dimensions.
Brake Clearance Template Comparator
Compare wheel-specific clearance templates.
Wheel Offset Visualizer
Illustrate wheel position changes.
Load, Pressure & Safety(13)
Tire Load Index Decoder
Translate load index into rated capacity.
Tire Load Index Comparator
Compare replacement and original ratings.
Tire Service Description Comparator
Compare load index and speed rating.
Tire Load Range Comparator
Compare load range specifications.
Standard Load vs XL Comparator
Compare published load and pressure specifications.
Single vs Dual Load Comparator
Compare application-specific load ratings.
Load-at-Pressure Table Tool
Look up applicable load capacities.
Replacement Load Equivalence Tool
Compare capacity at specified pressures.
Axle Load Distribution Calculator
Allocate entered loads across tires.
Tire Pressure Specification Comparator
Compare placard and manufacturer guidance.
Tire Pressure Unit Converter
Convert PSI, bar, and kPa.
Temperature–Pressure Scenario Calculator
Model pressure changes under stated assumptions.
UTQG Temperature Grade Comparator
Compare standardized temperature grades.
Tread Wear & Tire Life(12)
Tire Tread Depth Converter
Convert millimeters and thirty-seconds of an inch.
Tread Depth Difference Calculator
Compare measured remaining tread.
Tread Wear Diameter Calculator
Estimate diameter reduction from tread loss.
Usable Tread Percentage Calculator
Compare tread with a selected replacement threshold.
Tire Wear Rate Calculator
Calculate measured wear per distance.
Four-Tire Wear Comparator
Compare tread readings across wheel positions.
Tire Age Calculator
Calculate age from a DOT date code.
Tire Age Comparator
Compare manufacture dates across a set.
UTQG Treadwear Comparator
Compare reported treadwear grades.
Wheel and Tire Package Weight Calculator
Compare complete assembly weights.
Wheel and Tire Package Cost Calculator
Compare complete replacement packages.
Tire Package Break-Even Calculator
Compare extra costs with assumed savings.
Ratings, Testing & Mass(8)
UTQG Traction Grade Comparator
Compare standardized traction grades.
Tire Label Rating Comparator
Compare ratings within the same labeling scheme.
Rolling Resistance Comparator
Compare results from compatible test methods.
Wet Braking Test Comparator
Compare published results under matched conditions.
Tire Noise Comparator
Compare noise measurements under matched protocols.
Snow Performance Comparator
Compare published winter test results.
Tire Certification Marking Comparator
Compare reported certification markings.
Tire Weight Comparator
Compare published tire weights.
Cost & Ownership(9)
Tire Price per Unit Calculator
Compare individual tire prices.
Complete Tire Set Cost Calculator
Calculate costs for a specified quantity.
Installed Tire Cost Calculator
Include mounting, balancing, and entered fees.
Tire Rebate Comparison Calculator
Compare costs after applicable rebates.
Tire Cost per Mile Calculator
Use purchase cost and entered service life.
Tire Cost per Kilometer Calculator
Compare distance-based ownership costs.
Tire Warranty Comparator
Compare mileage coverage and conditions.
Prorated Tire Warranty Calculator
Apply a specified warranty schedule.
Tire Fuel Cost Scenario Calculator
Use entered fuel consumption assumptions.
Visualizers & Reports(5)
Side-by-Side Tire Visualizer
Display nominal tire silhouettes.
Tire Overlay Visualizer
Overlay sizes to highlight dimensional differences.
Tire Comparison Chart Generator
Create dimension and specification tables.
Batch Tire Size Calculator
Process multiple candidate sizes.
Tire Comparison Report Generator
Export inputs, sources, and calculated differences.
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