WebToolArcAutomotive Tools
Free browser-based automotive tools with instant results and no account required.
Gas Mileage Calculator
Calculate MPG, kilometers per liter, and liters per 100 km from distance and fuel used.
Automotive ToolsFuel Cost Calculator
Estimate fuel needed and trip fuel cost from distance, fuel economy, price, and number of trips.
Automotive ToolsTire Size Calculator
Calculate tire diameter, sidewall, circumference, width, and revolutions per mile from a metric or flotation tire size.
Automotive ToolsTire Size Comparison Calculator
Compare two tire sizes side by side and estimate dimensional and speedometer differences.
Automotive ToolsTire Diameter Calculator
Calculate overall tire diameter from width, aspect ratio, and wheel diameter.
Automotive ToolsTire Circumference Calculator
Calculate tire circumference from a tire size or known diameter.
Automotive ToolsTire Revolutions Per Mile Calculator
Calculate theoretical tire revolutions per mile and per kilometer.
Automotive ToolsSpeedometer Error Calculator
Estimate actual road speed after changing from one tire diameter to another.
Automotive ToolsWheel Offset Calculator
Compare wheel width and offset to estimate inner clearance and outer poke changes.
Automotive ToolsWheel Backspacing Calculator
Convert between wheel offset and approximate wheel backspacing.
Automotive ToolsGear Ratio Calculator
Estimate effective gear ratio after changing tire diameter and the ratio needed to restore stock gearing.
Automotive ToolsTire Sidewall Calculator
Calculate tire sidewall height from section width and aspect ratio.
Automotive ToolsMetric Tire to Inches Converter
Convert a metric tire size into width, sidewall, and overall diameter in inches.
Automotive ToolsInches to Metric Tire Size Converter
Find a nearby standard metric tire size for target inch diameter, width, and rim diameter.
Automotive ToolsFuel Economy Converter
Convert US MPG, UK MPG, km/L, and L/100 km.
Automotive ToolsEngine Displacement Calculator
Calculate engine displacement from bore, stroke, and cylinder count.
Automotive ToolsPower to Weight Ratio Calculator
Calculate horsepower-to-weight and kilowatt-to-weight ratios.
Automotive ToolsRPM to Speed Calculator
Convert engine RPM and gearing into theoretical vehicle speed, or speed back into engine RPM.