Browse by topic
Every calculator on greenhomesums, grouped by the decision it helps with.
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Landlord and MEES compliance calculators
EPC C by 2028 / 2030 compliance, cheapest-first retrofit stacks, grant stacking and penalty exposure for UK rental properties.
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Ofgem price cap and time-of-use tariff tools
Compare flat, Agile, Go and Cosy tariffs against the quarterly Ofgem cap — and see how tariff choice compounds over 10 years.
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Heat pump calculators and BUS grant checks
Running cost vs gas, 15-year total cost of ownership, Boiler Upgrade Scheme eligibility, and MEES-driven retrofits for landlords.
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UK energy grant calculators
Boiler Upgrade Scheme, ECO4, and grant-offset models for heat pumps, insulation and whole-home retrofits.
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Solar calculators for UK homes
Work out whether solar stacks up on your roof, how fast it pays back, and what batteries and export tariffs do to the numbers.
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EV home charging and tariff calculators
Charging cost by tariff, home vs public split, petrol-equivalent mileage cost, and overnight-window optimisation.