Electrical, Auto & Engineering Calculators
Ohm's law, horsepower and mileage.
Engineering and automotive tools: Ohm's law and voltage drop, resistor color codes, electricity cost, horsepower, fuel economy and tire sizing.
Electricity Cost CalculatorWork out how much an appliance costs to run from its wattage, usage and your electricity rate.Engine Displacement CalculatorCalculate total engine displacement from bore, stroke and cylinder count.Engine Horsepower CalculatorEstimate engine horsepower from a quarter-mile trap speed and vehicle weight.Fuel Cost CalculatorEstimate the fuel cost of a trip from its distance, your vehicle’s MPG and the fuel price.Gas Mileage CalculatorCalculate fuel economy in MPG, L/100km and km/L from miles driven and gallons used.Horsepower CalculatorConvert between torque, RPM and horsepower for a rotating shaft.Mileage Reimbursement CalculatorCalculate mileage reimbursement from miles driven and a per-mile rate.Ohm's Law CalculatorEnter any two of voltage, current, resistance and power to find the other two.Resistor Color Code CalculatorDecode a 4-band resistor color code into its resistance value and tolerance.Tire Size CalculatorCompute a tire’s diameter, circumference and revs per mile from its width/aspect/rim spec.Voltage Drop CalculatorEstimate the voltage lost along a conductor run from its length, current and resistance.