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Explore Calculators ↓Energy & Climate Calculators
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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 → NewHeating Cost by Fuel Type Calculator
Compare gas, electric, heat pump, propane, and oil heating costs side by side at your local rates.
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 →Solar CO2 Offset Calculator
See how many tons of CO2 your solar panels offset per year — and the tree-planting equivalent.
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 → NewRainwater Harvesting Calculator
See how many gallons your roof can collect each year and estimate water bill savings.
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 → NewSpace Heater Cost Calculator
Find out exactly how much it costs to run a space heater per hour, day, and month.
Calculate now → NewWashing Machine Energy Cost
Calculate the exact cost to run your washer per load, month, and year — including water and electricity.
Calculate now → NewWashing Machine Water Usage Calculator
How many gallons per load? Compare standard vs ENERGY STAR and see annual water savings.
Calculate now → NewHow Many Solar Panels Do I Need?
Enter your monthly electricity use and location — get exact panel count, system size, and payback.
Calculate now → NewWhy Is My Electric Bill So High?
Find the cause of your electricity spike and see exactly how much each factor is costing you.
Diagnose 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.
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All calculators are completely free with no hidden fees.
From the blog
Practical guides to help you save energy and reduce your footprint.
Solar Panel Cost in 2026: What Homeowners Actually Pay
$15,000–$25,000 before incentives. After the 30% ITC, most homeowners pay $10,500–$17,500. Real costs by system size, state, and financing option.
Energy SavingsHow Much Does It Cost to Run AC All Day?
A 3-ton central AC running 8 hrs/day costs $3.64/day. Enter your AC size and rate — get exact hourly, daily, and monthly cost.
SolarHow Much CO2 Does Solar Save? Real Numbers by System Size
A 6kW solar system offsets ~5 metric tons of CO2 per year — equal to planting 230 trees. Here's the full carbon math.
Energy SavingsBest Thermostat Settings to Save Money on Heating and Cooling
The right thermostat settings cut your HVAC bill by 10–15% with zero investment. Here are the exact temperatures — by season and time of day.
Energy SavingsHow to Save on Laundry Energy Costs: Washer & Dryer Guide
Your washer and dryer cost $150–250/year to run. Here's exactly where that money goes and what cuts it most.
Carbon & TransportHow Much Does an EV Save on Fuel Costs? Real Numbers by State
The average EV saves $800–1,400/year on fuel. Here's how to calculate your exact savings based on your state's rates.
