Energy & Sustainability toolkit
Energy & Sustainability calculators for make the energy math clearer.
Free tools to estimate solar panel payback, electric-vehicle savings, heat-pump and efficiency upgrades, and your carbon footprint — so you can see the numbers before you invest.
Popular energy & sustainability calculators
- Solar Panel CalculatorSystem size, cost after incentives, savings, and payback from your billSolar & storage
- Carbon Footprint CalculatorAnnual household CO2 from energy and travel, broken down by sourceTransport & footprint
- HVAC SEER Savings CalculatorCooling energy and cost saved by upgrading to a higher SEERHome efficiency
- EV Savings CalculatorCompare electric vs gas fuel cost per year, per mile, and lifetimeTransport & footprint
8 calculators
Solar & storage
2Home efficiency
4- Heat Pump Savings CalculatorHeating savings vs electric resistance, gas, oil, or propane
- HVAC SEER Savings CalculatorCooling energy and cost saved by upgrading to a higher SEER
- Insulation Savings CalculatorAnnual heating cost saved by upgrading a surface's R-value
- LED Savings CalculatorEnergy, money, and CO2 saved by switching bulbs to LED
Transport & footprint
2Energy & Sustainability calculator FAQ
- Will solar panels or a heat pump pay for themselves?
- It depends on your energy use, local electricity and fuel prices, installation cost, and incentives. The solar panel and heat pump calculators estimate annual savings and payback years from your own numbers.
- How much can switching to LED bulbs save?
- LEDs use a fraction of the power of incandescent bulbs and last far longer. The LED savings calculator estimates yearly savings from the number of bulbs, hours of use, and your electricity rate.
- Are the energy savings guaranteed?
- No. Results are estimates based on typical efficiency figures and the prices you enter. Actual savings vary with weather, usage habits, equipment, and rate changes.