SaveWatt provides free calculators for home electricity costs, EV charging, EV versus petrol comparisons, solar payback, battery storage and heat pump running costs.
The site is designed to help households test energy assumptions before making larger decisions about vehicles, tariffs, solar panels or heating.
The calculators use figures entered by the user, such as kWh price, usage, mileage, efficiency, installation cost and expected savings. Results are estimates and can change with tariffs, weather, vehicle efficiency, property type and supplier terms.
SaveWatt pages should make assumptions visible, explain what can change the result, and avoid presenting estimates as quotes or professional energy advice.
If a page needs correction or a calculator assumption looks unclear, please use the contact page.