All 34 Free US Green Energy Calculators
Free US solar savings, federal tax credit (ITC), payback, EV vs gas, battery & heat pump calculators. State-specific data for all 50 states — no signup.
Solar
Net Metering Calculator 2026: Solar Export Credits
Estimate 2026 net metering credits for exported solar, the value of self-consumed power and simple …
Off-Grid Solar Calculator 2026 — Panels & Battery Size
Size an off-grid solar system in 2026: panel kW, battery bank kWh, inverter, charge controller and …
Solar EV Charging Savings Calculator (2026)
Estimate how much solar it takes to charge your EV at home, what the added panels cost in 2026, and …
Solar Lease vs Buy Calculator 2026: 25-Year Comparison
Compare leasing vs buying solar in 2026 over 25 years. Enter your lease payment, escalator and …
Solar Loan Calculator 2026: Monthly Payment & Interest
Calculate your 2026 solar loan payment, total interest and year-1 cash flow vs bill savings, with an …
Solar Panel Output Calculator 2026 — Daily & Annual kWh
Estimate 2026 solar panel output in kWh per day, month and year from system size, peak sun hours, …
Solar Payback Period Calculator 2026 (No Federal Credit)
Estimate how many years until solar panels pay for themselves in 2026, using installed cost, annual …
Solar PPA vs Buy Calculator 2026 — 25-Year Comparison
Compare a solar PPA vs buying in 2026: 25-year payments, net savings and payback, with no homeowner …
Solar ROI Calculator 2026 — 25-Year Return & IRR
Estimate 2026 solar ROI, IRR, payback and 25-year net savings from your installed cost and year-1 …
Solar Savings Calculator 2026: Bill, Payback & 25-Yr Savings
Estimate 2026 solar savings from your electric bill, rate, sun hours and net metering. See installed …
Solar Self-Consumption Calculator 2026 — Use vs Export
Estimate how much solar you use at home vs export in 2026, the bill savings from each, and payback …
Solar System Size Calculator 2026 — How Many Panels?
Find the solar system size you need in 2026: kW, panel count, roof space and installed cost from …
EV
EV Battery Degradation Calculator 2026: Range Loss by Year
Estimate how much range and battery capacity your EV loses by year based on age, mileage, charging …
EV Charger Installation Cost Calculator 2026 (Level 2)
Estimate 2026 Level 2 EV charger installation cost: hardware, labor, panel upgrade and local …
EV Charging Cost Calculator 2026: Home Cost per Month
Calculate your 2026 EV home charging cost per month, per year and per mile, and compare home …
EV Road Trip Cost Calculator 2026: Charging vs Gas
Estimate the total charging cost of an EV road trip in 2026. Mix home and DC fast charging for any …
EV vs Gas Cost Calculator 2026: Fuel Cost Per Mile
Compare 2026 EV charging vs gasoline costs per mile and per year. Enter your mileage, gas price, MPG …
Battery
Battery Bank Size Calculator 2026: Off-Grid kWh & Ah
Size an off-grid or backup battery bank in 2026: enter daily watt-hours, days of autonomy, battery …
Home Battery Storage Calculator 2026: Cost & Payback
Size a home battery for backup and estimate 2026 installed cost, rebates, savings and payback. No …
Tesla Powerwall ROI Calculator 2026 — Is It Worth It?
Tesla Powerwall 3 ROI calculator for 2026: installed cost, rebates, TOU arbitrage savings and …
Home Energy
Heat Pump Savings Calculator 2026: vs Gas Furnace
Compare 2026 heat pump running costs with a gas furnace: annual savings, payback after state or …
Heat Pump Water Heater Savings Calculator 2026
Estimate 2026 heat pump water heater savings vs an electric tank: annual dollars saved, payback and …
Home Energy Cost Calculator — Bill Breakdown 2026
Calculate your monthly electricity bill by appliance in 2026. Find your biggest energy users and see …
Home Insulation Savings Calculator 2026 — Attic & Wall ROI
Estimate 2026 attic and wall insulation savings: annual heating and cooling dollars saved, payback …
LED Lighting Savings Calculator 2026 — Bulb Payback
Estimate 2026 savings from switching to LED bulbs: annual dollars, 10-year savings, payback and CO₂ …
Smart Thermostat Savings Calculator 2026 — Nest & Ecobee
Estimate 2026 smart thermostat savings: heating and cooling savings, payback and 5-year return for …
Time-of-Use Rate Savings Calculator (2026)
Estimate 2026 savings from shifting EV charging, laundry and dishes to off-peak time-of-use hours, …
Incentives
IRA Home Energy Rebate Calculator 2026 (HEAR & HOMES)
Estimate 2026 home energy rebates under state HEAR and HOMES programs: heat pump, water heater, …
Solar Tax Credit Calculator 2026: Do You Still Qualify?
Check whether any federal solar tax credit applies to you in 2026 (the 30% §25D credit ended for …
Commercial
Agricultural Solar Calculator 2026 — Farm Solar ROI & REAP
Estimate farm solar size, cost, payback and 25-year savings in 2026 with the §48E business credit …
Commercial Solar ROI Calculator 2026: §48E ITC & MACRS
Estimate commercial solar payback in 2026 with the §48E credit, 5-year MACRS depreciation and USDA …
Wind
Climate
CO₂ Offset Calculator 2026: How Much Carbon Solar Saves
Estimate how many tonnes of CO₂ your solar panels offset each year and over 25 years, with tree and …
Home Carbon Footprint Calculator 2026: Energy & Driving
Estimate your household's yearly CO2 from electricity, gas heating and driving, then see how solar, …