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Automotive Converters

Browse automotive converters for fuel economy, MPG, L/100km, tire size, wheel size, torque, horsepower, engine displacement, oil viscosity, boost pressure, speed, mileage, EV range, and battery capacity. Use these tools to compare car, truck, motorcycle, EV, and performance-related units.

Find Automotive Converters

Use the dropdown to jump to a converter group, then choose the automotive converter you want to build or open.

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Fuel Economy Converters

Converters for MPG, L/100km, km/L, fuel use, and common mileage comparisons.

2 converters
Fuel Economy Converter Convert MPG, L/100km, km/L, miles per liter, gallons per 100 miles, and related fuel economy units. MPG to L/100km Converter Convert miles per gallon to liters per 100 kilometers for comparing US and international fuel economy ratings.

Tire & Wheel Converters

Converters for tire sizing, wheel sizing, diameter, sidewall height, width, and fitment references.

2 converters
Tire Size Converter Convert tire sizes and compare width, aspect ratio, rim size, sidewall height, tire diameter, and circumference. Wheel Size Converter Convert wheel size measurements, rim diameter, width, offset references, inches, millimeters, and fitment values.

Engine & Performance Converters

Converters for horsepower, torque, engine displacement, oil viscosity, boost pressure, and performance units.

6 converters
Torque Converter Convert lb-ft, ft-lb, N·m, in-lb, kgf·m, and other torque units used for engines and fasteners. Horsepower Converter Convert horsepower, kilowatts, watts, metric horsepower, brake horsepower, and engine power units. Engine Displacement Converter Convert engine displacement between cubic inches, cubic centimeters, liters, and cubic centimeters per cylinder. Oil Viscosity Converter Compare oil viscosity grades and common engine oil references such as 0W-20, 5W-30, 10W-40, and more. Boost Pressure Converter Convert boost pressure between psi, bar, kPa, MPa, kg/cm², and other turbo or supercharger pressure units. Power to Weight Converter Convert horsepower per pound, horsepower per ton, kW/kg, kW/tonne, and performance comparison units.

Speed & Mileage Converters

Converters for road speed, distance, odometer units, mileage, and trip-related unit changes.

2 converters
Speed Converter Convert mph, km/h, meters per second, feet per second, knots, and common driving speed units. Mileage Converter Convert miles, kilometers, meters, feet, and trip distance units for vehicles, odometers, and routes.

EV & Battery Converters

Converters for electric vehicle range, battery capacity, energy use, and charging-related units.

2 converters
EV Range Converter Convert EV range units and compare miles, kilometers, mi/kWh, kWh/100 mi, and km/kWh references. Battery Capacity Converter Convert battery capacity between kWh, Wh, Ah, mAh, volts, energy capacity, and EV battery units.

About Automotive Converters

Automotive converters help change vehicle-related units into easier comparisons. They are useful for fuel economy, international vehicle specs, tire sizing, wheel sizing, engine performance, boost pressure, EV efficiency, battery capacity, and speed or distance conversions.

Common Uses

  • Convert MPG to L/100km when comparing US and international fuel economy.
  • Convert horsepower to kilowatts for engine and EV power ratings.
  • Convert torque between lb-ft and N·m for engines, wheels, and fasteners.
  • Convert engine displacement between liters, cubic inches, and cubic centimeters.
  • Convert tire sizes to compare diameter, sidewall height, and circumference.
  • Convert boost pressure between psi, bar, and kPa.
  • Convert mph to km/h for road speed comparisons.
  • Convert EV battery and range units for electric vehicle planning.

Common Automotive Conversions

  • 1 mile = 1.60934 kilometers
  • 1 gallon = 3.78541 liters
  • 1 horsepower = about 0.7457 kilowatts
  • 1 lb-ft = about 1.35582 newton-meters
  • 1 psi = about 6.89476 kPa
  • 1 liter = 1,000 cubic centimeters
  • 1 inch = 25.4 millimeters
  • 1 kWh = 1,000 watt-hours

Automotive Converter Tips

Automotive Converter FAQ

What are automotive converters used for?

Automotive converters are used to change vehicle-related units such as MPG, L/100km, horsepower, kilowatts, torque, engine displacement, tire size, speed, mileage, boost pressure, and EV battery capacity.

Is MPG the same as L/100km?

No. MPG measures distance traveled per gallon of fuel. L/100km measures fuel used per 100 kilometers. Higher MPG is better, while lower L/100km is better.

Why convert horsepower to kilowatts?

Horsepower is common in the United States, while kilowatts are commonly used for metric vehicle power ratings and electric vehicle motor output.

Why does tire size conversion matter?

Tire size affects overall diameter, sidewall height, circumference, clearance, speedometer readings, gearing feel, and ride height.

Are automotive converter results exact?

Unit conversions are mathematically consistent, but vehicle specs can vary by tire brand, measurement method, manufacturer rating, drivetrain loss, real-world conditions, and setup.

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