Automotive Calculator

  • CC to HP Calculator
    Estimate engine horsepower from displacement in cc using the rule of thumb hp ≈ cc / 15. Adjust the divisor for your engine type and see kW too.
  • Horsepower to Kilowatts (kW) Converter
    Convert horsepower (hp) to kilowatts (kW) instantly. Uses 1 hp = 0.7457 kW. Free, accurate power converter for engines, motors and machinery.
  • Fuel Cost Calculator (Cost per Mile vs Gallon)
    Calculate the total gas cost of any trip from distance, MPG, and price per gallon. See gallons needed and your cost per mile instantly.
  • Car Sales Tax Calculator
    Estimate sales tax on a car purchase including trade-in credit and fees. See the tax due and your total out-the-door price instantly.
  • Car Lease Payment Calculator
    Estimate your monthly car lease payment from cap cost, residual value, money factor and term. Breaks out depreciation, finance fee and tax (US method).
  • Horsepower from Quarter-Mile Calculator
    Estimate engine horsepower from quarter-mile trap speed and vehicle weight using the Hale/Fox formula HP = weight × (mph/234)³. Free and instant.
  • MPH to KPH Converter
    Convert miles per hour (mph) to kilometers per hour (km/h) instantly. Accurate vehicle speed conversion using the exact 1.609344 factor.
  • Tire Plus Sizing Calculator
    Compare two tire sizes for plus sizing. Calculate overall diameter, circumference, and the percentage difference to keep your speedometer accurate.
  • Towing Capacity Calculator
    Calculate your maximum safe trailer weight by subtracting your loaded truck weight from the GCWR. Free, fast towing capacity calculator.
  • Coolant Mix Ratio Calculator
    Calculate how much antifreeze concentrate and water you need for any total coolant volume and desired concentration. Get exact liters and the mix ratio.
  • Stopping Distance from Friction Calculator
    Calculate the stopping distance of a sliding object from its speed and friction coefficient using d = v²/(2·μ·g). Includes deceleration and stop time.
  • EV Tax Credit Savings Calculator (US)
    Estimate your US federal EV tax credit (up to $7,500) and net vehicle cost after MSRP and income (MAGI) eligibility caps under the IRA.
  • VinFast Electricity Cost per Mile vs Gas Calculator
    Compare your VinFast EV electricity cost per mile against a gas car. Enter kWh/mile, electricity rate, gas price and MPG to see your per-mile and annual savings.
  • VinFast DC Fast Charging Time Calculator (10–80%)
    Estimate VinFast EV DC fast charging time from 10% to 80% using battery capacity, charger power, and efficiency. Quick, free charging time estimate.
  • VinFast Charging Time Calculator
    Estimate how long it takes to charge any VinFast EV. Enter battery kWh, charger power, start/target SOC and efficiency to get charge time in hours and minutes.
  • VinFast VF8 Range Calculator
    Estimate your VinFast VF8 driving range from battery capacity, state of charge, and energy efficiency. Instant miles and kilometers result.
  • Electric vs Gas Car Cost Calculator
    Compare the cost per mile of an electric vs gas car. Enter gas price, MPG, electricity rate and EV efficiency to see your annual fuel savings.
  • Total Cost of Car Ownership Calculator
    Estimate the true 5-year total cost of owning a car: depreciation, fuel, insurance, maintenance, financing and taxes — with per-year and per-month figures.
  • Monthly Fuel Cost Calculator
    Estimate your monthly fuel cost from miles driven, MPG, and fuel price. See gallons used and yearly spend instantly with this gas cost calculator.
  • Speedometer Correction Calculator
    Find your true speed after changing tire size. Enter indicated speed plus old and new tire diameters to see corrected speed and speedometer error.
  • Engine RPM from MPH Calculator
    Calculate engine RPM at any speed from your gear ratio, final drive ratio, and tire diameter. Free RPM-from-MPH calculator with worked example.
  • Air-Fuel Ratio (AFR) Calculator
    Convert lambda (λ) to air-fuel ratio (AFR) for gasoline, ethanol, diesel and more. Find rich, lean or stoichiometric mixtures instantly.
  • EV Cost Per Mile Calculator
    Calculate the energy cost per mile of your electric vehicle from its efficiency (miles/kWh) and your electricity rate. See cost per 100 miles and trip cost.
  • Company Car Benefit-in-Kind (BIK) Tax Calculator (UK)
    UK company car tax calculator. Enter P11D price, CO₂ BIK percentage and your income tax band to find your annual and monthly benefit-in-kind tax.

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