Energy prices change, so your estimate should too.
Use your own electricity price, fuel price, export rate or charging tariff instead of relying on a generic national average.
EV, solar and home energy tools
Know what energy choices really cost.
SaveWatt helps households compare EV charging, solar payback, battery storage, heat pumps and everyday electricity use with clear, practical calculators.
Start with the decision
Energy calculators built for real household questions
EV charging cost calculatorEstimate home or public charging cost from battery size, tariff and charging losses.
EV vs petrol savings calculatorCompare annual fuel cost against EV electricity cost for the same mileage.
Home electricity cost calculatorWork out appliance running costs from watts, hours and unit rate.
Solar panel payback calculatorEstimate simple payback from install cost, annual generation and export tariff.
Battery storage payback calculatorSee whether tariff shifting can justify a home battery purchase.
Heat pump running cost calculatorCompare heat pump electricity cost with a gas boiler equivalent.
Compare options before speaking to suppliers.
Check the rough numbers for EV charging, solar, batteries and heat pumps before you request quotes or commit to a product.
Clear assumptions beat magic answers.
Each calculator shows the main formula behind the result so you can adjust the numbers and understand what drives the outcome.