The thinking behind the tools
About EnergySums
Clearer numbers for everyday energy decisions, from running an appliance to exploring a change at home.
A practical starting point
EnergySums brings household energy calculators and explanations together in one place. Use them to understand a running cost, compare options or explore the assumptions behind an upgrade.
The aim is to make an estimate easier to follow: what you enter, how the calculation works and what the result includes.
Questions from across the home
The available tools cover different decisions and countries. Choose your country in the header to find the relevant calculators and blogs.
- Appliances, cooking and everyday electricity use.
- Heating, cooling and hot water.
- Electric vehicles, solar panels and home batteries.
- Tariffs, running costs and longer-term comparisons.
Figures that reflect your situation
Where a tool supports personal prices, use your own bill, equipment label or quote. Published reference prices provide context; they may differ from your tariff.
Results show their working and assumptions so you can see what drives the estimate.
The team behind the tools
The EnergySums team builds tools and explanations to make household energy figures easier to follow. Calculators show their working, and blogs provide context for using the figures.
A useful estimate has limits
Real energy use changes with habits, weather, equipment and prices. An estimate is a starting point for a decision, not a promise of savings.
There is no expert review. Check the sources and speak to a qualified professional before making a significant financial, installation or safety decision.