Green & Sustainable Finance Calculators
Evaluate the financial impact of environmentally conscious decisions.
16 free calculators in this category
Battery Storage ROI Calculator
Work out home battery payback from installed cost, any rebate and expected annual savings, and test it against the years the system is expected to last.
Biomass Boiler ROI Calculator
Compare biomass boiler installation cost against annual fuel and servicing savings to find the payback year and the net position over a chosen horizon.
Bulk Refill vs Individual Packaging
Work out the net saving from switching household products to bulk or refill formats, after the one-off cost of containers is deducted.
Carbon Offset Calculator
Annual and lifetime cost of offsetting your CO2 emissions, from the tonnage, the price per tonne you can actually buy at, and any reduction at source.
Electric Bike ROI Calculator
Work out e-bike payback from purchase price, the daily transport cost it displaces, working days per year and annual running costs.
Electric Bike vs Car Calculator
Calculate e-bike payback from replacing car commuting and associated vehicle costs, with the annual car-cost offset broken out.
Energy Rating Improvement Cost Calculator
Payback period and twenty-year net benefit on energy efficiency work, from the bill reduction it delivers and any gain in property value.
Ethical Shopping Premium Calculator
The yearly and cumulative cost of buying the ethical version, worked back from your monthly basket and the markup it carries.
Heat Pump Calculator
Heat pump break-even year and lifetime return against gas heating, given install cost and projected annual energy savings.
Heat Pump vs Boiler Break-Even Calculator
Work out how long a heat pump takes to pay back its extra install cost against a boiler, from the two install costs and the two annual running costs.
Hydropower ROI Calculator
Model micro-hydro ROI and payback from installation cost, annual kWh generated, the value per kWh and yearly maintenance across a chosen lifespan.
Renewable Energy Investment Calculator
Project what an assumed annual return compounds to over your chosen period, with the total gain and the multiple of the original amount.
Second Hand Clothing Savings Calculator
Work out what buying clothing second-hand rather than new saves over the years, from your own item count and average prices on each side.
Second-Hand vs New Calculator
Compare cost per year of buying second-hand versus new, including a repair buffer and the expected useful life of each option.
Second Hand vs New Cost Calculator
Compare the lifetime cost of buying second-hand against new across repeat purchases like clothing, electronics and household goods.
Tidal Energy ROI Calculator
Estimate the return on a tidal energy project from build cost, capacity, capacity factor, electricity price and maintenance over your chosen period.
About Green & Sustainable Finance Calculators
These calculators quantify the costs and potential savings of sustainable choices — from solar panel payback periods and EV ownership costs to carbon offset calculations and energy efficiency upgrades. Each tool models the financial trade-offs of green alternatives against conventional options.