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Free calculators for energy costs, solar savings, and carbon footprint — all in one place.
Explore Calculators ↓Energy & Climate Calculators
Pick a tool and get your result in seconds.
Home Energy Cost Calculator
Estimate your total annual home energy bill based on location, home size, and usage habits.
Calculate now →Electric Bill Calculator
Find out exactly what's driving your electric bill and where you can cut costs.
Calculate now →LED vs Incandescent Savings Calculator
See how much you save per year by switching to LED bulbs — down to the dollar.
Calculate now →Insulation Savings Calculator
Estimate annual heating and cooling savings from upgrading your home insulation.
Calculate now →Heating vs Cooling Cost Calculator
Compare heating and cooling costs by season and find where your energy dollars are going.
Calculate now →Appliance Energy Cost Calculator
Calculate how much any appliance costs to run per day, month, or year.
Calculate now →Solar Panel Savings Calculator
Estimate how much you'll save on electricity by going solar based on your location and usage.
Calculate now →Solar Panel ROI Calculator
Find your solar payback period and long-term return on investment before you buy.
Calculate now →Wind Turbine Calculator
Estimate how much electricity a small wind turbine would generate for your property.
Calculate now →Battery Storage Calculator
Find the right battery storage size for your home solar setup and see the savings.
Calculate now →Carbon Footprint Calculator
Calculate your total annual carbon footprint across energy, transport, food, and lifestyle.
Calculate now →Flight Carbon Calculator
See the CO₂ emissions of any flight route and find out how to offset them.
Calculate now →Car vs EV Carbon Calculator
Compare the lifetime carbon emissions of a gas car vs an electric vehicle.
Compare now →Diet Carbon Calculator
Find out how your diet contributes to your carbon footprint — and how to reduce it.
Calculate now →Home Carbon Footprint Calculator
Calculate the carbon emissions from your home's heating, cooling, and appliances.
Calculate now →Water Usage Calculator
Estimate your household water consumption and see where you can cut back.
Calculate now →Tree Planting Offset Calculator
Find out how many trees you'd need to plant to offset your carbon footprint.
Calculate now → NewGreen Home Upgrade ROI Calculator
Calculate the return on investment for green upgrades like solar, insulation, and heat pumps.
Calculate now →Simple tools for a greener home
We built EcoEnergyCalc because understanding your energy use shouldn't require an engineering degree.
Science-based estimates
All calculators use established energy formulas and real utility rate data.
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Works on any device
Desktop, tablet, or phone — all tools work everywhere.
Free forever
All calculators are completely free with no hidden fees.
From the blog
Practical guides to help you save energy and reduce your footprint.
EV vs Gas Car: True Cost of Ownership Over 5 Years
Purchase price, fuel, maintenance, insurance — the full 5-year cost comparison, honestly laid out.
SolarSolar Panel Tax Credits & Incentives by State (2026)
A state-by-state breakdown of solar rebates, tax credits, and net metering policies available this year.
Energy SavingsHeat Pump vs Furnace: Which Is Better for Your Home?
A full comparison on cost, efficiency, climate suitability, and carbon impact.
IncentivesRenewable Energy Subsidies: The Complete U.S. Guide
Federal tax credits, state rebates, and utility incentives you may be leaving on the table.