Geothermal, biomass, hydro, CHP, and renewable energy calculators. Browse our free renewable tools below — all calculators are instant, accurate, and require no sign-up.
Biomass Energy Calculator — Calculate the energy output from burning biomass fuels. Enter mass, heat value, and boiler efficiency to estimate usable thermal energy in kWh or BTU.
CHP Efficiency Calculator — Calculate the overall efficiency of a Combined Heat and Power (cogeneration) system. Compare CHP thermal plus electrical efficiency to separate generation.
Geothermal Heat Pump Savings Calculator — Calculate annual savings from a geothermal heat pump vs conventional HVAC. Compare operating costs for heating and cooling with ground-source heat pumps.
Geothermal Installation ROI Calculator — Calculate the return on investment and payback period for a geothermal heat pump installation. Factor in incentives, energy savings, and system lifespan.
Grid Parity Calculator — Determine when a renewable energy source reaches grid parity. Compare the levelized cost of renewable energy (LCOE) to retail electricity rates.
Micro-Hydro Power Output Calculator — Calculate the power output of a micro-hydro system from water flow rate, head height, and turbine efficiency. Plan small-scale hydroelectric installations.
REC Value Calculator — Calculate the cost of Renewable Energy Certificates (RECs) to offset your electricity with renewable energy. Estimate your green energy premium.
Renewable Energy Percentage Calculator — Calculate what percentage of your energy comes from renewable sources. Track your renewable energy mix and progress toward sustainability goals.