Energy & running costs calculators
Estimate electricity use, charging costs and potential savings from changes to home or vehicle energy use.
Before you begin
- Energy in kWh depends on power and operating time; a tariff is the price per kWh.
- Use your own electricity and fuel prices when comparing alternatives.
- A payback period only exists in these models when the change produces positive net savings.
Choose your calculator
Solar Savings Calculator
See estimated annual solar savings and review net upfront cost and simple payback using values you enter.
CalculatorHeat Pump Savings Calculator
See estimated annual savings and review current annual energy cost and heat pump annual energy cost using values you enter.
CalculatorElectricity Cost Calculator
See estimated electricity cost and review energy charge and fixed charge using values you enter.
CalculatorAppliance Electricity Cost Calculator
See appliance electricity cost and review total energy (kwh) and active energy (kwh) using values you enter.
CalculatorEV Charging Cost Calculator
See charging session cost and review grid energy (kwh) and energy charge using values you enter.
CalculatorEV Vs Gas Calculator
See annual ev operating savings and review ev annual operating cost and gas annual operating cost using values you enter.
CalculatorCar Depreciation Calculator
See estimated future value and review estimated depreciation and entered annual rate using values you enter.
CalculatorGas Mileage Calculator
See fuel consumption (l / 100 km) and review economy (km / l) and us mpg using values you enter.
CalculatorRoad Trip Fuel Calculator
See estimated trip fuel cost and review fuel required (l) and cost per traveler using values you enter.
CalculatorCar Ownership Cost Calculator
See annual car ownership cost and review monthly equivalent and cost per km using values you enter.
Understand the calculation
L/100 km vs km/L: understand your fuel economy
Learn which fuel economy number to enter, convert L/100 km to km/L, and calculate liters needed for a trip with a worked 150 km example.
guideUS vs Imperial gallons: why your fuel result changes
Understand US and Imperial gallon sizes, the difference between US and UK mpg, and how to match fuel prices to the right gallon.
conversionJoules to attojoules converter
Convert joules (J) to attojoules (aJ). Calculate any value, follow the unit-factor steps and check a conversion table.
conversionAttojoules to joules converter
Convert attojoules (aJ) to joules (J). Calculate any value, follow the unit-factor steps and check a conversion table.
conversionJoules to centijoules converter
Convert joules (J) to centijoules (cJ). Calculate any value, follow the unit-factor steps and check a conversion table.
conversionCentijoules to joules converter
Convert centijoules (cJ) to joules (J). Calculate any value, follow the unit-factor steps and check a conversion table.