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Interactive Tools

• Tire Size Calculator — Compare two sizes and see them drawn to scale.
• All 136 Tools — Every tire and wheel tool on one page.
• How It Works — Four steps from your size to a safe fit.
• Tire Size FAQ — Quick answers on sizes, speed and rims.

Tire Dimensions & Geometry

• Tire Diameter Calculator — Find how tall a tire stands. Read it in inches or mm.
• Tire Circumference Calculator — Find the distance around a tire. It is one full turn.
• Tire Radius Calculator — Find the tire's radius. That is half its height, with no load on it.
• Tire Sidewall Height Calculator — Find the sidewall from the width and the aspect ratio.
• Tire Section Width Calculator — Work back to the width from the other sizes.
• Tire Aspect Ratio Calculator — Find the aspect ratio from the sidewall and the width.
• Rim Diameter Calculator — Find the rim size from the tire's height and sidewall.
• Front-to-Rear Circumference Calculator — See how far apart front and rear tires roll.
• Corrected Distance Calculator — Fix the miles on the odometer.
• Outer Tire Position Calculator — See how far the tire moves out to the fender.
• Approved Rim Width Checker — Check the rim widths the tire maker allows.
• Rim-Dependent Section Width Estimator — See how the rim width changes the tire width.

Revolutions & Speed of Rotation

• Tire Revolutions per Mile Calculator — See how many times a tire turns in one mile.
• Tire Revolutions per Kilometer Calculator — See how many times a tire turns in one km.
• Tire Revolutions per Second Calculator — See how fast a tire spins at a set speed.
• Tire RPM Calculator — See how many turns a wheel makes each minute.
• Measured Tire Rollout Calculator — Roll the tire once, then find its real size.

Decoders & Unit Converters

• Metric Tire Size Decoder — Read a code like 225/45R17. Each part is explained.
• Flotation Tire Size Decoder — Read a code like 33x12.50R15. Each part is explained.
• Metric-to-Inch Tire Converter — Turn a metric size into inches.
• Inch-to-Metric Tire Converter — Find the metric size that is close to an inch size.
• Tire Width Unit Converter — Switch tire width between mm and inches.
• Tire Diameter Unit Converter — Switch tire height between mm and inches.
• Tire Circumference Unit Converter — Switch the distance around a tire between units.
• Tire Size Input Validator — Check that a tire code is typed the right way.

Tire Comparison & Fitment

• Tire Size Comparison Calculator — Put two tire sizes side by side. See every change.
• Multiple Tire Size Comparator — Compare three or more sizes at once.
• Tire Height Difference Calculator — See how much taller or shorter a new tire is.
• Tire Width Difference Calculator — See how much wider or thinner a new tire is.
• Sidewall Difference Calculator — See how the sidewall changes from one size to the next.
• Circumference Difference Calculator — See how the distance around the tire changes.
• Rim Diameter Difference Calculator — See how the rim size changes between two sizes.
• Revolutions Difference Calculator — See how turns per mile change with a new size.
• Stock vs Replacement Tire Calculator — Check a new size against the one your car came with.
• Nominal vs Published Dimension Comparator — Compare the math with what the maker lists.
• Exact Tire Model Dimension Comparator — Compare the real size of two tire models.
• Loaded Radius Comparator — Compare how tall each tire sits under a load.
• Rolling Circumference Comparator — Compare how far each tire rolls in one turn.
• AWD Tire Matching Tool — Check that all four tires match for AWD.
• Spare Tire Size Comparator — Compare your spare with the tires on the road.
• Full-Size Spare Matching Tool — Check that a full spare matches the other four.
• Measuring Rim Width Comparator — Compare the rim each maker used to measure.

Plus & Minus Sizing

• Equivalent Tire Diameter Finder — Find sizes that are about as tall as yours.
• Same-Rim Alternative Size Finder — Find other sizes that fit the rim you have.
• Target Sidewall Height Calculator — Find sizes with the sidewall you want.
• Target Overall Diameter Calculator — Find the aspect ratio that hits your height.
• Target Tire Width Finder — Find sizes in the width you want.
• Custom Diameter Tolerance Filter — Set your own limit for how much the height can change.
• Plus-One Tire Size Calculator — Go one inch up in wheel size. Keep the same height.
• Plus-Two Tire Size Calculator — Go two inches up in wheel size. Keep the same height.
• Custom Plus-Sizing Calculator — Go up by any wheel size and see what fits.
• Minus-Sizing Calculator — Go down a wheel size, often for winter tires.
• Staggered Tire Size Calculator — Use a wider tire on the back than on the front.

Speedometer, Odometer & Gearing

• Speedometer Error Calculator — See how a new size changes what the speedometer shows.
• Actual Speed Calculator — Find your true speed after a size change.
• Indicated Speed Calculator — Find what the speedometer will show at a true speed.
• Speedometer Correction Factor Calculator — Get one number to fix speed and distance.
• Speedometer Correction Table Generator — Make a table of shown speed and true speed.
• GPS Speed Calibration Calculator — Use a GPS to check your speedometer.
• Odometer Error Calculator — See how far off the odometer reads after a size change.
• Fuel Economy Reading Correction Calculator — Fix your mpg after a tire size change.
• Speed Sensor Pulses Calculator — Find how many pulses the sensor sends per mile.
• Effective Gear Ratio Calculator — See how tire size changes your gearing.
• Engine RPM at Speed Calculator — Find engine RPM at a set road speed.
• Speed at Engine RPM Calculator — Find road speed at a set engine RPM.
• Gear-by-Gear Speed Calculator — See the top speed in each gear.
• Tire Size and Crawl Ratio Comparator — Compare crawl ratio for off-road use.
• Tractive Force Calculator — Find the push a tire puts on the road.

Wheel Offset & Suspension Clearance

• Winter Wheel Package Calculator — Plan a set of winter wheels and tires.
• Ground Clearance Change Calculator — See how much a new size lifts or drops the car.
• Wheel Arch Gap Calculator — See how the gap to the arch changes.
• Measured Clearance Tire Planner — Use your own measurements to find sizes that fit.
• Inner Tire Clearance Calculator — See how close the tire gets to the strut.
• Wheel and Tire Fitment Comparator — Compare where two setups sit in the wheel well.
• Wheel Width Calculator — Compare rim widths for a tire.
• Wheel Offset Calculator — Find the offset of a wheel.
• Offset Difference Calculator — See how a new offset moves the wheel.
• Wheel Backspacing Calculator — Find the backspacing from width and offset.
• Backspacing-to-Offset Converter — Turn backspacing into offset, and back.
• Wheel Frontspacing Calculator — Find how far the wheel sticks out.
• Inner Wheel Position Calculator — See how the inner rim edge moves.
• Outer Wheel Position Calculator — See how the outer rim edge moves.
• Spacer Effective Offset Calculator — Find the new offset with a spacer.
• Target Wheel Position Calculator — Find the offset that puts the wheel where you want it.
• Track Width Change Calculator — See how much wider the car's stance gets.
• Wheel Bolt Pattern Comparator — Check that the bolt pattern fits your hub.
• Hub Bore Comparator — Check that the center hole fits your hub.
• Brake Clearance Template Checker — Check that a wheel clears your brakes.

Load Indices & Speed Ratings

• Equivalent Axle Ratio Calculator — Find the axle ratio that brings back stock gearing.
• Tire Load Index Decoder — Turn a load index into kg and lb per tire.
• Tire Speed Rating Decoder — Turn a speed letter into a top speed.
• Tire Load Range Decoder — Read load range letters such as C, D and E.
• Standard Load vs XL Comparator — See how much more an XL tire can carry.
• P-Metric vs LT Size Comparator — Compare a car tire with a light truck tire.
• Single vs Dual Tire Rating Comparator — See the load limit for single and dual tires.
• Load-at-Pressure Lookup Tool — Find the load a tire can carry at each pressure.
• Tire Pressure Unit Converter — Switch between PSI, bar and kPa.

Vehicle-Specific Tire Sizes

• Tire Service Description Comparator — Compare the load and speed code of two tires.
• OEM Tire Size Lookup — Find the size your car came with.
• Vehicle Trim Tire Size Lookup — Find the size for your trim and wheels.
• VIN-Based Tire Specification Lookup — Use your VIN to find the factory tire size.
• Lifted Vehicle Tire Fitment Lookup — See what sizes fit a lifted truck.
• Passenger Car Tire Size Calculator — Read a car tire code and see each size.
• Light Truck Tire Size Calculator — Read LT and float sizes for trucks.
• Commercial Truck Tire Size Tool — Check sizes for big trucks and their loads.
• Trailer Tire Size Calculator — Compare ST tire sizes for trailers.
• RV Tire Size Comparator — Compare tire and wheel needs for an RV.
• ATV/UTV Tire Size Calculator — Read ATV and UTV tire codes.

Motorcycle & Bicycle Tire Decoders

• Motorcycle Tire Size Calculator — Read a motorcycle tire code.
• Motorcycle Inch-to-Metric Converter — Find the metric size close to an old inch size.
• Motorcycle Alphanumeric Size Converter — Read old codes such as MT90-16.
• Motorcycle Front/Rear Size Comparator — Compare front and rear bike tires.
• Scooter Tire Size Calculator — Read scooter tire codes in mm or inches.
• Bicycle Tire Size Decoder — Read bike tire codes such as 700x25C.
• ETRTO Bicycle Size Converter — Read ETRTO codes such as 25-622.
• French Bicycle Size Converter — Read French codes such as 700C.
• Bicycle Inch Size Lookup — Sort out which 26-inch or 27-inch size you have.
• Bicycle Bead-Seat Diameter Checker — Check that the tire and rim are the same size.
• Bicycle Rim Width Compatibility Tool — Check that the tire fits your rim width.
• Bicycle Frame Clearance Calculator — Check that a tire fits in your frame.
• Bicycle Computer Circumference Calculator — Set your bike computer with the right wheel size.
• Bicycle Tube Size Finder — Find the tube that fits your tire.
• Bicycle Hookless Compatibility Checker — Check that a tire is safe on a hookless rim.

Visualizers, Charts & Reports

• Tread Depth Unit Converter — Switch tread depth between mm and 32nds.
• Tread Wear Diameter Calculator — See how worn tread makes the tire shorter.
• New vs Worn Tire Circumference Calculator — Compare a new tire with a worn one.
• Tire Size Chart Generator — Make a chart for the sizes you pick.
• Tire Diameter Ranking Tool — Sort sizes from short to tall.
• Side-by-Side Tire Visualizer — Draw two tires side by side to scale.
• Tire Overlay Visualizer — Draw one tire on top of the other.
• Wheel Offset Visualizer — Draw how a new offset moves the wheel.
• Batch Tire Size Calculator — Work out many sizes at once.
• Tire Size Formula Explainer — See each step of the math for a size.
• Tire Fitment Checklist Generator — Make a list of what to check before you buy.
• Printable Tire Size Reference Generator — Make a size chart you can print.
• Tire Size Report Generator — Save a report that compares your sizes.

Company & Support

• About Us — Who we are and how we check our math.
• Contact Us — Send a question or an idea.

Legal & Policies

• Privacy Policy — What we collect, and what we do not.
• Terms & Conditions — The rules for using this site.

Other Languages

• हिन्दी — Hindi version.
• Español — Spanish version.
• Русский — Russian version.
• Français — French version.
• Deutsch — German version.
• Italiano — Italian version.
• Português — Portuguese version.
• বাংলা — Bengali version.
• 日本語 — Japanese version.
• 한국어 — Korean version.
• Bahasa Melayu — Malay version.
• Polski — Polish version.
• Bahasa Indonesia — Indonesian version.
• العربية — Arabic version.
• Български — Bulgarian version.
• Türkçe — Turkish version.
• Svenska — Swedish version.