CC to HP
Estimate a horsepower range from engine displacement without pretending CC converts exactly to HP.
Open calculatorThree comparisons worth getting right
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36 motoring calculators
Search everything or filter by fuel, EV, performance, tyres, ownership and journeys.
WHP to HP
Estimate crank horsepower from measured wheel horsepower and an adjustable drivetrain assumption.
Open calculatorPower to Weight
Calculate bhp/tonne, kW/tonne and watts/kg from vehicle power and mass.
Open calculatorEngine Hours to Miles
Estimate equivalent road mileage while separating optional idle hours.
Open calculatorBHP / HP / PS / kW
Convert commonly mixed vehicle power units accurately.
Open calculatorTorque Converter
Convert Nm, lb-ft, kgf·m and lb-in.
Open calculatorTorque at RPM → HP
Calculate horsepower or kW from torque at a specific engine speed.
Open calculatorEngine Displacement
Convert cc, litres and cubic inches.
Open calculatorFuel Injector Flow
Convert cc/min and lb/hr with an editable fuel-density assumption.
Open calculatorGear Ratio / RPM / Speed
Calculate theoretical road speed from gearing, RPM and tyre size.
Open calculatorTyre Circumference & Speed
Calculate nominal diameter, circumference, revs/mile and road speed.
Open calculatorTyre Size Comparison
Compare diameter, ride-height and speedometer effects between tyre sizes.
Open calculatorWheel Offset
Compare wheel width and ET changes for inner clearance and outer poke.
Open calculatorMPH to Minutes per Mile
Convert road speed into time per mile and kilometre.
Open calculatorEV Break-Even
Estimate how long energy savings may take to recover a higher EV purchase price.
Open calculatorEV Charging Mix
Blend home, off-peak and public charging to get a realistic electricity price.
Open calculatorReal-World MPG Adjuster
Stress-test an official MPG figure and see the annual fuel-cost impact.
Open calculatorTotal Ownership Cost Comparator
Compare energy, depreciation, finance, tax, insurance, servicing, tyres and other ownership costs side by side.
Open calculatorKeep vs Change Car
Compare keeping your current car with changing over the same ownership period.
Open calculatorEV Tariff Break-Even
Include household electricity and find how much cheap-rate charging you need.
Open calculatorCharging Membership Break-Even
Find the public-charging usage needed before a subscription pays for itself.
Open calculatorCheaper Fuel Detour
Check whether driving farther for cheaper fuel actually creates a net saving.
Open calculatorJourney & Fuel Budget
Combine fuel, parking, tolls, sharing and annual fuel costs, with MPG sensitivity.
Open calculatorUK MPG Calculator
Calculate imperial MPG from miles travelled and litres used.
Open calculatorCommute Cost
Turn a daily commute into weekly, monthly and annual fuel spending.
Open calculatorMPG ↔ L/100km
Convert UK imperial MPG to L/100km and back without mixing gallon standards.
Open calculatorEV Charging Cost
Estimate energy bought and charging cost from battery percentage and tariff.
Open calculatorEV Charging Time
Estimate charging duration from battery energy, charger power and efficiency.
Open calculatorPetrol vs EV Energy Cost
Compare petrol fuel cost and EV electricity cost over the same annual mileage.
Open calculatorFuel Savings
Compare annual fuel spend between two vehicles with different real MPG.
Open calculatorDrivetrain Loss
Compare known crank and wheel power figures as a percentage difference.
Open calculator0–60 & Quarter-Mile Estimator
Explore empirical performance estimates from power and vehicle weight.
Open calculatorFuel Cost Per Mile
Convert MPG and pump price into a simple pence-per-mile figure.
Open calculatorAnnual Fuel Cost
Estimate a year of petrol or diesel spending from your actual mileage.
Open calculatorFuel Cost Split
Estimate a journey fuel bill and divide it fairly between passengers.
Open calculatorRoad Trip Cost
Estimate total, return-trip and per-person fuel costs for a longer drive.
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