All Tire Calculators

Convert tire pressure between PSI and Kilopascals.

OEM tire size lookup for all Subaru models 2010–2025. Compare tire size difference with AWD safety rating, browse lifted fitment charts, and verify tire pressure.

Convert kilopascals to PSI for tire pressure, boost/MAP sensor readings, and vacuum. Full conversion chart, vehicle-type pressure guide, and TPMS unit-change instructions.

Compare P-Metric tire dimensions side-by-side.

Compare two tire sizes side-by-side. Diameter, sidewall, speedometer error, revs/mile, and visual chart. P-metric & flotation.

Find the exact diameter difference between two tire sizes. Safety thresholds, speedometer error %, AWD tolerance, and re-gear guidance.

Calculate speedo error from tire size changes.

Convert tire pressure units: PSI and kPa.

Convert between wheel offset and backspace.

See how tire size changes impact effective gear ratio.

Calculate engine RPM at speed based on tire size & gear ratios.

Analyze diameter differences for staggered tire setups.

Calculate scrub radius from SAI, spindle offset, and ET — or estimate the delta from a wheel/spacer swap. Includes drivetrain safety rating.

Calculate total tire height from P-Metric specs.

Check if a tire width is suitable for a given rim width.

Find the aspect ratio for a target tire diameter.

Find max load capacity from load index number.

Find max speed capability from a tire's speed rating letter.

Explore tire options for different wheel sizes.

Assess if a tire is stretched or pinched on a rim.

Estimate a tire's effective radius under load.

Determine tire age from the DOT date code.

Convert tire load range to ply rating and max PSI.

Compare spare tire diameter with primary tires for safety.

Understand Treadwear, Traction, and Temperature ratings.

Estimate inner/outer clearance changes for new setups.

Estimate tire contact patch area from load and pressure.

Calculate tire sidewall height from P-Metric specs.

Calculate tire revolutions per mile and kilometer.

Estimate the internal air volume of a tire.

Calculate total tire diameter from P-Metric specs.

Understand camber and its effects on wear and handling.

Understand caster and its influence on steering stability.

Learn how toe-in/toe-out affects tire wear and stability.

Understand what a tire's UTQG treadwear rating signifies.

Understand a tire's UTQG temperature grade (A, B, or C).

Estimate remaining tread depth and prorated value of a tire.

Convert flotation tire sizes (35×12.50R17, etc.) to P-Metric and get full dimensions: diameter, sidewall, circumference, revs/mile.

Find the recommended rim width range for any tire section width using ETRTO guidelines.

Calculate sidewall height, overall diameter, and circumference for motorcycle tires.

Convert between P-Metric, flotation, and LT tire size formats with full dimension output.

Calculate BMW tire fitment for any model — compare OEM vs aftermarket sizes, check xDrive 1% rolling diameter rule, M-series staggered specs, and speedometer error.

Convert metric tire sizes to inches, build P-metric/LT sizes, decode alpha-numeric vintage sizes, and look up load index — all in one free tool.

Decode any Mercedes tire size, compare two sizes with a 4MATIC ±1% safety check, look up OEM fitment for every C-Class/E-Class/S-Class/GLC/GLE/GLS/EQS generation, understand MO/MOE/MO1 run-flat markings, check bolt patterns, and get tire pressure in PSI, kPa, or bar.

Free Audi tire size calculator with OEM model lookup for A3 A4 A6 Q3 Q5 Q7 Q8 e-tron GT. Get quattro AWD safety verdict (Torsen/ultra/electric), speedometer error at 100/130 km/h, ground clearance change, and EV load index check.

Find OEM tire sizes for every Tesla — Model 3, Y, S, X, and Cybertruck. Compare sizes, check range impact, EV safety ratings, bolt patterns, and staggered fitment. Free tool.

Calculate ATV flotation tire diameter, circumference, revs/mile, speedometer error, and ground clearance vs stock.

Complete Mazda MX-5 Miata tire size calculator for NA, NB, NC, ND. Decode sizes, compare stock vs new with speedometer correction, check generation-specific fender clearance, find sizes by diameter, and get track-day compound recommendations.

Toyota Tacoma tire size calculator for all generations (G1 1995–2004, G2 2005–2015, G3 2016–2023, G4 2024+). Decode sizes, compare stock vs upgrade with speedometer correction, check fender clearance by lift height, and get lift-kit-specific size recommendations. All gens share 6×139.7 bolt pattern.

Lexus tire size calculator for IS, ES, NX, RX, GX, and LX. IS 350 staggered 245/40R18(F)/275/35R18(R). Decode sizes, compare stock vs upgrade with AWD diameter check, and get OEM, summer, winter, and plus-1 setup recommendations.

Ford F-150 tire size calculator for all trims — XLT, Lariat, Raptor, and Lightning EV. 6×135 bolt pattern, OEM fitment, lift-kit clearance, speedometer correction, and Lightning IRS limits.

Calculate total tire height (overall diameter) in inches or mm — from P-metric code, inches direct, or compare two sizes side-by-side. Five modes: metric decode, inches direct, comparison, wheel+tire total, and find by height.

Free Jeep tire size calculator covering Wrangler, Gladiator, Cherokee, and Grand Cherokee. OEM sizes, max fitment by lift height, gear ratio recommendations, crawl ratio, metric ↔ inch conversion, and speedometer correction.

Convert metric ↔ inch ↔ alpha sizes, look up OEM fitment, compare tires, get terrain pressure recommendations, and check rim compatibility for dirt bikes.

Decode any press-on, pneumatic, or metric forklift tire size. Get full inches & mm dimensions, metric ↔ imperial equivalents, wear thresholds, load index lookup, and brand fitment data for Toyota, Hyster, Yale, Clark, and more.

Calculate golf cart tire dimensions from any size (18×8.5-8, 20×10-10, etc).

Free truck tire size calculator covering all formats: metric (295/75R22.5), numeric (11R22.5), and flotation (35×12.50R17). Compare sizes, calculate gear ratio recalibration, speedometer correction, load/ply capacity, and view OEM semi truck & lifted truck tire charts.

Calculate tire rolling resistance force (N), power loss (W/kW), and EV range impact for cars, SUVs, and trucks. Crr presets, 7 road surfaces, ISO 28580 dynamic Crr, grade, and aero drag.

Free GMC tire size calculator with OEM lookup by model, year, and trim for Sierra 1500/2500HD/3500HD, Yukon, Canyon, Acadia, Terrain, and Envoy. Includes size comparison, speedometer correction, gear ratio recalibration, lift guide, AT4/AT4X specs, and sidewall decoder.