Solar Energy Calculators — Green
13 free solar energy calculators in green & sustainability. Each tool shows step-by-step formulas, worked examples, and detailed explanations to help you get accurate results instantly.
All Solar Energy Calculators
Compare utility electricity rates including TOU, tiered, and flat rate structures.
Estimate geothermal heat pump installation and operating costs vs conventional HVAC.
Compare lifetime costs and efficiency of heat pumps versus gas furnaces for your climate.
Calculate payback period for home battery storage from electricity rates and usage patterns.
Estimate where your home energy is being wasted and potential savings from improvements.
Calculate solar net metering savings from surplus generation and utility buyback rates.
Size a complete off-grid solar system from daily energy use, battery days, and sun hours.
Size a home battery system from daily usage, solar production, and backup hours needed.
Compare buying, leasing, and PPA solar financing options over 25 years.
Calculate how many years until solar panels pay for themselves from savings and incentives.
Estimate solar roof tile costs vs traditional solar panels from roof size and energy needs.
Calculate federal and state solar tax credits and incentives from installation cost.
Calculate residential wind turbine energy output from rotor size, wind speed, and efficiency.
About Solar Energy Calculators
Our solar energy calculators in green & sustainability are designed for students, professionals, and anyone who needs quick, accurate results. Every calculator includes the underlying formula, step-by-step solutions, and real-world worked examples so you can understand the math behind the answer.
Whether you need to solve a one-time problem or verify your own calculations, these free tools cover the most common solar energy scenarios. All results are computed in your browser — no data is sent to any server.
What You Can Calculate
This section includes 13 tools: Electricity Rate Comparison Calculator, Geothermal Heating Cost Calculator, Heat Pump Vs Furnace Calculator, Home Battery Payback Calculator, Home Energy AUDIT Calculator, Net Metering Calculator, Off Grid Solar System Calculator, Solar Battery Size Calculator, and 5 more. Each calculator is free to use with no signup required.