Free Green Energy Calculators

Make smarter clean energy decisions with real data. Our calculators use current rates, government data, and transparent methodology to help you estimate costs, savings, and ROI for the most popular green energy upgrades.

EV vs Gas Cost Comparison

Compare the total cost of owning an electric vehicle vs a gas car over 5–10 years. Includes fuel, maintenance, insurance, depreciation, and tax credits.

Solar Panel Payback Period

Calculate your solar panel ROI and see how many years until your system pays for itself. Factor in system size, electricity rates, and incentives.

EV Charging Cost Estimator

Calculate how much it costs to charge your EV at home and on the road. Compare Level 1, Level 2, and DC fast charging against gas costs.

Heat Pump Savings Calculator

Compare heat pump vs furnace costs including installation, annual operating expenses, available rebates, and long-term savings by climate zone.

EV Tax Credit Eligibility

Federal EV credits ended Sept 30, 2025 — check whether a grandfathered purchase qualifies and see which state EV incentives are still available.

Home Battery Storage ROI

Evaluate whether home battery storage makes financial sense. Factor in TOU rate arbitrage, solar pairing, backup power value, and state incentives.

Heat Pump Water Heater Savings

See whether a heat pump water heater is worth it. Compare operating costs against your electric, gas, or propane tank and get your payback period.

Which Calculator Is Right for You?

Thinking about switching to an electric vehicle?

Start with the EV vs Gas Cost Comparison for a full ownership cost analysis. Then check the EV Tax Credit calculator to check grandfathered federal eligibility and current state incentives, and use the Charging Cost Estimator to plan your charging budget.

Considering solar panels?

The Solar Payback Period calculator shows your break-even timeline and 25-year savings. Pair it with the Battery Storage ROI calculator to see if adding a home battery boosts your savings further.

Want to lower your heating costs?

The Heat Pump Savings calculator compares heat pump vs furnace costs for your climate zone, including IRA rebates that can cover up to $8,000 of installation costs.