Free Energy Calculators 2026

3 free tools · Last updated March 2026

Solar savings, electricity costs, and carbon footprint calculators — updated for 2026 incentives and rates.

Calculate solar panel ROI, payback period, and 25-year savings including 30% federal tax credit.

Estimate your monthly electricity bill based on appliances, usage, and local kWh rate.

Measure your personal carbon footprint from transportation, home energy, diet, and shopping.