Seven calculators. One straight answer each.
Pick the question you have. Each tool models your home from a few inputs and shows the assumptions behind the result, so you can sense-check it before you ever speak to an installer. Every output is an estimate, not a quote.
Solar Calculator
Generation from satellite irradiance for your postcode, adjusted for roof orientation and shading. Returns annual saving, payback and 25-year benefit.
Open 🔋Battery Calculator
How much solar a battery lets you keep, or what off-peak charging shifts if you have no panels. Round-trip losses included.
Open ♨️Heat Pump Calculator
Annual running cost at a real SCOP against your current gas, oil or electric heating, with the £7,500 grant taken off the install price.
Open 🔌EV Charger Calculator
Cost per mile charging at home on a standard versus an off-peak EV tariff, set against petrol or diesel at today's pump price.
Open 🏠Home Energy Audit
A prioritised whole-home plan: which measures to do first, what each costs and saves, and the order that pays back fastest.
Open 💷Energy Bill Optimiser
Your current cost against the price cap and a smart tariff, plus the change that would save you the most this year.
Open 🌍Carbon Footprint
Household emissions in tonnes of CO₂e from your energy, car and flights, using current UK conversion factors, with the highest-impact cuts ranked.
OpenRun the Home Energy Audit
It pulls every calculator together into one plan for your home and budget.
Start the audit →Why you can trust the number
Real data, not rules of thumb
Solar yield comes from PVGIS satellite irradiance for your exact location. Tariffs track the Ofgem price cap. Heat-pump efficiency uses a SCOP you can change.
The maths is shown
Each result lists the figures that shaped it. Nothing is hidden behind a "request a quote" wall, and the inputs are yours to adjust.
No tuning to upsell
The estimate is not nudged toward a bigger system. We would rather be useful than optimistic. Quotes are optional and never required to see your result.