What does it cost to run?
Understand the appliances and everyday routines behind your energy use.
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Household energy calculators
Clarity for your
home energy.
Understand everyday running costs and compare bigger home decisions with calculators that show their working.
Find a calculator
Free to useNo account neededSee the working
Find your starting point
From daily use to bigger decisions.
Which option fits my home?
Compare heating, cooling and travel choices using your own figures.
Is it time for an upgrade?
Explore solar, batteries and home improvements before taking the next step.
Featured calculators
Start with an everyday question.
Appliances
Appliance running cost
Enter appliance power, running hours and your electricity price. See energy use and costs from an hour to a year, including an assessed on-and-off cycle.
Bills & tariffs
Price cap estimate
Choose your region, payment method and energy use to estimate yearly and monthly bills. See unit prices and standing charges, or compare a supplier quote.
Heating & cooling
Heat pump vs boiler
Start with heating gas use or useful heat demand, then add boiler efficiency, heat pump performance and prices. Compare running costs and any gas standing charge that remains.
Solar & EV
EV charging cost
Enter mileage, vehicle efficiency and your home and public charging mix. Estimate charging energy, cost per distance and running costs using your selected electricity prices.
Solar & EV
Solar and battery payback
Enter assessed solar generation, home use, battery delivery, export prices and your quote. See first-year energy benefit and the simple payback of the entered system.
Appliances
Dehumidifier cost
Use your dehumidifier power, running hours and tariff to estimate electricity costs. You can also compare the cost of drying one laundry load with a tumble dryer.
From EnergySums
Latest blog
Simple guides to help you understand your home's energy use and costs.
Coming soon
Our first blog is on the way.
Our latest blog will appear here once published. In the meantime, explore our tools to compare energy costs using your own figures.
Explore toolsClarity comes from the details
An answer you can
actually understand.
An estimate is more useful when you can see what went into it. The inputs, assumptions and working belong beside the answer.
Read our methodologyMake the numbers yours.
Use your own electricity price, usage and equipment details for an estimate that reflects your situation.
Follow the answer.
See the formula, units and assumptions. Understand how each input changes the result.
Know what to check.
Find official sources and checked dates wherever published prices or rules are used.
Understand the numbers. Choose with confidence.
Everyday choices feel easier when you understand the energy behind them.
A few good questions
Before you
get started.
Good tools should be easy to understand, including their limits.
Are the calculators free?
Yes. You can use EnergySums without a subscription or payment.
Do I need an account?
No. Calculations run in your browser. You can start with the details you have.
Will this match my bill exactly?
Results are estimates. Actual costs can vary with your tariff, usage, weather and equipment.
Which electricity price should I use?
Use your current bill where possible. Tools using published prices show the applicable source and date.
Which countries are covered?
Choose the United Kingdom, Australia, Canada or United States to explore the relevant tools.
Is this professional advice?
No. Check the sources and speak to a qualified professional before making a significant decision.
Energy, understood.
Your next question
starts here.
Find a little more clarity about energy at home.