Auto

Pick a Auto calculator below. Every tool includes the formula, a worked example, and answers to common questions.

Price a vehicle loan: subtract down payment and trade-in from the car price to get the amount financed, then see monthly…

Enter speed, reaction time, and braking deceleration. Get reaction distance, braking distance, and total stopping distan…

Enter energy added (kWh) and your home and public electricity rates. Compare what the same charge costs at home versus a…

Enter distance driven, fuel used, and optional price per litre. You get metric consumption (L/100km), the same figure as…

Compute a gear ratio from drive and driven tooth counts, multiply by final drive for overall ratio, or compare two gears…

Convert between mechanical horsepower (hp), kilowatts (kW), and metric horsepower (PS / CV / ch). Match US, European, an…

Enter peak power and vehicle weight (curb or with driver). Compare cars with hp/tonne, kW per kilogram, and imperial hp/…

Enter horsepower and vehicle weight (with driver). Get a ballpark 1/4-mile ET and trap speed from classic power-to-weigh…

Enter transmission gear ratio, final drive, and tire diameter. Convert RPM → speed or speed → RPM to estimate cruise rev…

Enter stock and new tire size (width / aspect / rim). Get overall diameter change and the speedometer error — optionally…

Enter trip distance, your car’s fuel economy, and the price at the pump. See how much fuel you need and what the trip wi…

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