Independent UK home energy calculators

We don't capture your details, route you to installers, or earn commission on the result. Just transparent calculations using authoritative public data, with every assumption shown and every source dated.

Heat pump savings

Compare a heat pump's annual cost against your current gas, oil, or LPG heating - including the £7,500 BUS grant and your local price cap rates.

Solar + battery payback

Coming soon

Calculate solar panel returns with battery storage, including comparison across all current SEG export tariffs.

Battery-only ROI

Coming soon

Model a battery installed without solar - charging cheap overnight and discharging during peak hours.

Grant eligibility

Coming soon

Check eligibility for the Boiler Upgrade Scheme, ECO4, and regional schemes for Scotland, Wales, and Northern Ireland.

Why another calculator hub?

Most existing tools are built by installers, manufacturers, or energy suppliers. They're free because they capture your details for sales follow-up. The numbers they produce often nudge toward a particular outcome.

We aim to be different: independent, evidence-based, and fully transparent about every assumption and data source. Each tool shows when its underlying data was last verified.

We make money through advertising, not lead capture. If you find the tool useful, that's the business model working.