Auto & Travel Calculators
Work out your gas mileage, the fuel cost of a trip and the drive time, what it costs to charge an electric car, how new tires change your speedometer, stopping distances, and the horsepower and displacement of your engine.
30 calculators · A–Z of all calculators
- Gas Mileage CalculatorMPG, liters per 100 km and fuel cost per mile.
- Driving CO₂ CalculatorCar CO₂ emissions from miles and mpg.
- Fuel Cost CalculatorGas cost of a trip, round trip and per person.
- Mileage Reimbursement Calculator2026 IRS mileage rates.
- Tire Size CalculatorTire diameter and sidewall, and how a new size changes the speedometer.
- RPM to MPH CalculatorSpeed from RPM, gears and tire size.
- Horsepower CalculatorHorsepower from torque and RPM, or torque from horsepower.
- Engine Displacement CalculatorCubic inches, cc and liters from bore, stroke and cylinders.
- Compression Ratio CalculatorStatic compression ratio of an engine.
- Travel Time CalculatorDrive time and arrival time from distance, speed and stops.
- Stopping Distance CalculatorReaction and braking distance from your speed.
- Tongue Weight CalculatorRecommended trailer tongue weight.
- EV Charging CalculatorElectric car charging time and cost.
- MPGe CalculatorkWh/100 mi to MPGe and cost.
- Quarter Mile Calculator1/4-mile ET and trap speed from weight and horsepower.
- Wheel Offset CalculatorCompare wheel offset: poke, clearance and backspacing.
- EV vs Gas Cost CalculatorFuel cost per mile, per year and payback.
- Density Altitude CalculatorPressure and density altitude, plus crosswind.
- Tire Load Index CalculatorDecode a tire sidewall: load index, speed rating and size.
- Crosswind Component CalculatorCrosswind and headwind from runway, wind and gusts.
- Car Affordability CalculatorCar price you can afford under the 20/4/10 guideline.
- EV Range in Cold Weather CalculatorWinter range of an electric car, with and without the heater.
- Road Trip Cost CalculatorWhole-trip cost: gas, hotels, food and tolls, per person.
- Oil Change Cost CalculatorSynthetic vs conventional per year, shop or DIY.
- Injector Size CalculatorFuel injector flow in lb/hr and cc/min for your horsepower.
- Axle Ratio Change CalculatorEngine RPM before and after a new axle ratio or tire size.
- Speedometer Error CalculatorReal speed and odometer error after new tires or gears, or against GPS.
- Boost and Airflow CalculatorTurbo pressure ratio, airflow in lb/min and charge air temperature.
- Tire Tread Life CalculatorMiles and months left on your tires from tread depth and wear.
- Car Battery CCA CalculatorCold cranking amps your engine needs and battery charge from voltage.