Home energy, clearly explained
Free calculators and plain-English guides on solar, home batteries, power stations, heat pumps, insulation and everyday appliances. Every number comes with its source and the date we checked it.
Run the numbers for your home
Pick your country, keep our sourced defaults or enter your own bill, and see the result straight away.
- Is Switching Worth It? Savings and Payback CalculatorCompare your current appliance or heating with a more efficient option and see the yearly saving, payback time and 10-year result.Open calculator →
- Solar Panel Payback CalculatorEstimate solar generation, yearly bill savings and payback time from your system size, local yield, self-use share and export rate.Open calculator →
- Portable Power Station Calculator: Runtime, Size and Cost per kWhList the appliances you need in an outage and see runtime, the capacity you need and the cost per kWh compared with a fuel…Open calculator →
- Home Battery Payback CalculatorEstimate what a home battery saves by storing surplus solar or charging on a cheap rate, and how many years it takes to pay…Open calculator →
- Heat Pump vs Gas or Oil Boiler: Running Cost CalculatorCompare heat pump running costs with your gas or oil boiler, find the break-even efficiency (SCOP) and estimate payback after grants.Open calculator →
- Smart Thermostat Savings CalculatorEstimate what a smart thermostat could save on your heating and cooling bill and how quickly it pays back, using ENERGY STAR field data.Open calculator →
- Appliance Running Cost Calculator (Standby Included)Work out what any appliance costs to run per hour, day and year from its watts, hours of use and standby power, in your…Open calculator →
Browse by topic
- Power Stations & Portable PowerPlain-English guides to portable power stations: sizing, runtimes, CPAP and fridge backup, and comparisons built on published specs.See guides →
- Solar & Home BatteriesIs solar worth it, which home battery fits, and what plug-in balcony solar is allowed: guides for the US, UK and Australia with sources.See guides →
- Heating & CoolingHeat pump running costs, air-to-air vs air-to-water, and thermostat settings that help: clear heating guides using current energy prices.See guides →
- Insulation & Draught-ProofingWhat insulation and draft-proofing really cost and save, which jobs to do first, and when to call a professional. Sourced UK and US figures.See guides →
- EV ChargingChoosing a home EV charger: circuit sizing, smart-charging rules, grants for renters and flat owners, and the features worth paying for.See guides →
- Smart Energy & MonitoringSee where your electricity goes: energy monitors from free smart-meter apps to circuit-level kits, plus smart plugs and time-of-use tariffs.See guides →
- Efficient AppliancesHeat pump dryers, induction hobs and efficient fridges: what they really save, with honest running-cost maths and current prices.See guides →
- Grants, Rebates & IncentivesCurrent energy grants and rebates explained: who qualifies, how much, and deadlines for the UK, US, Australia and Canada, with official sources.See guides →
How we work
- Sources and dates. Figures come from regulators, official statistics and manufacturers, with a link and a “last checked” date.
- No fake tests. When a comparison is based on published specs, we say so.
- Commissions don’t change rankings. Some links may earn us a commission at no cost to you. How that works.