Energy & Sustainability Calculators
Calculate solar panel needs, electricity costs, carbon footprints, and the ROI of going green. These tools help you make informed energy decisions whether you're sizing a generator or comparing electric vs. gas costs.
- ✓Solar: panel sizing, ROI, payback period
- ✓Cost analysis: electricity bills, LED savings, electric vs. gas
- ✓Sustainability: carbon footprint, water usage, rainwater harvesting
- ✓Sizing: BTU, generator capacity, heat loss
Most used: Solar Panel Calculator, Electricity Cost Calculator, Carbon Footprint Calculator
Try any of the 12 environmental & energy calculators below — or get one free for your AI.
Every calculator on this page is free to use right now. You can also download any one as a Claude skill file (free with email) to chat with it in Claude Code, ChatGPT, or any AI platform. Or get the full Energy & Sustainability Pack for $29.
Common workflows in this category
Click any scenario to jump into the calculator with the example pre-loaded.
12 free calculators
BTU Calculator
Calculate the correct BTU capacity for heating and cooling your room or home. Avoid undersizing and wasting money on oversized units.
Carbon Footprint Calculator
Calculate your personal carbon footprint from driving, flying, and home energy. See where you stand and get realistic reduction strategies.
Electric vs Gas Cost Calculator
Compare the true operating cost of electric vs gas appliances. Decide whether to upgrade based on real, long-term savings.
Electricity Bill Calculator
Estimate your total monthly electricity bill from multiple appliances. Plan for seasonal peaks and identify high-cost devices.
Electricity Cost Calculator
Calculate the true cost to run any appliance per hour, day, or month. Identify energy-wasting devices and reduce your electric bill.
Generator Size Calculator
Calculate the generator wattage needed to run your essential appliances during a power outage. Account for starting surges.
Heat Loss Calculator
Calculate heat loss through walls, windows, roof, and basement. Identify where insulation improvements deliver the biggest savings.
LED Savings Calculator
Calculate exact annual savings from switching incandescent or CFL to LED. See payback period and lifetime savings in minutes.
Rainwater Harvesting Calculator
Estimate how much rainwater you can collect from your roof. Plan tank size and annual savings for outdoor watering and conservation.
Solar Panel Calculator
Determine the exact number of solar panels required to cover your home's electricity usage. Includes system sizing and roof space estimates.
Solar ROI Calculator
Calculate your solar panel payback period and lifetime savings. Understand when your investment breaks even and how much you save long-term.
Water Usage Calculator
Calculate your household water consumption and monthly cost. Identify water-wasting fixtures and plan conservation strategies.