Free calculators built on official UK data. See costs, savings, grants, and payback periods for heat pumps, insulation, solar panels, and more.
Calculate installation costs, the £7,500 BUS grant deduction, annual running costs vs gas, and your payback period.
Most popularSee how much you could save with loft, cavity wall, or solid wall insulation. Check if you qualify for free installation.
Free insulation availableFind the cheapest way to improve your EPC rating. Improvements ranked by cost-effectiveness. Essential for landlords.
Landlord essentialCalculate generation, bill savings, Smart Export Guarantee income, and 25-year returns based on your roof and location.
0% VAT until 2027Full 15-year cost comparison of a new gas boiler against a heat pump. Installation, running costs, maintenance, and grants.
Side-by-side comparisonCheck your eligibility for the Boiler Upgrade Scheme, ECO4, GB Energy Scheme, and other UK energy grants in one place.
Up to £7,500 availableUpdated quarterly with each new price cap. Currently using Q1 2026 rates.
Installation costs and typical savings by property type from the UK's leading authority.
Government energy consumption data published under the Open Government Licence.
Grant schemes verified against published eligibility criteria. Updated monthly.