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 UK households compare electricity costs, EV charging, heat pump running costs, solar payback, battery storage and EV vs petrol savings with clear, practical calculators.
Start with the decision
Energy calculators built for real household questions
Electricity cost calculator UKUse watts, hours and pence per kWh as an appliance running cost calculator for UK bills.
Electric car charging cost calculator UKEstimate home or public EV charging cost from battery size, tariff and charging losses.
Heat pump cost calculator UKEstimate air source heat pump running cost and compare it with gas or oil boiler cost.
Solar calculator payback UKEstimate simple solar panel payback from install cost, annual generation and export tariff.
EV vs petrol cost calculatorCompare annual fuel cost against EV electricity cost for the same mileage.
Home battery storage payback calculatorSee whether tariff shifting can justify a home battery purchase.
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.
SaveWatt calculator FAQs
What can I calculate with SaveWatt?
SaveWatt helps UK households estimate electricity running costs, EV charging cost, heat pump running cost, solar payback, battery storage payback and EV versus petrol savings.
Are the calculators quotes or guarantees?
No. They are planning estimates. Your actual bill, tariff, installation cost, driving pattern, weather and supplier terms can change the result.
Why should I enter my own tariff?
Energy prices change. Using your own unit rate, export rate or charging tariff gives a more useful estimate than a generic national average.
Built around visible assumptions.
The homepage links to calculator pages for EV charging, solar, batteries, heat pumps and household electricity, and each calculator is designed to show the main inputs behind the estimate.
SaveWatt also keeps an energy calculator methodology page and a contact route so unclear assumptions can be corrected.