Browse by Category
Calculator Categories
Find the right calculator for solar ROI, EV charging, battery storage, wind, geothermal, and home energy decisions. Each category groups tools with visible formulas, assumptions, data-source notes, and related planning links.
Start with the decision
Use categories as a planning map. Solar pages focus on ROI, payback, panel count, and state policy; EV pages compare home charging with gasoline; storage pages separate backup sizing from solar economics.
Check assumptions before results
Calculator outputs depend on utility rates, project year, equipment cost, energy use, efficiency, and incentive eligibility. Replace defaults with your own bill, quote, and local rules whenever possible.
Use the next linked tool
Most clean-energy decisions need more than one estimate. Move from household energy use to solar ROI, from EV charging to solar sizing, or from battery backup to generator comparison when the assumptions overlap.
Solar
Solar panel sizing, ROI analysis, and solar energy calculators for residential systems.
EV Charging
Electric vehicle charging cost calculators and gasoline vs. electric comparison tools.
Battery Storage
Battery capacity planning and home energy storage calculators for backup and solar integration.
Energy Efficiency
Appliance energy usage tracking and home electricity consumption analysis tools.
Wind Energy
Wind turbine sizing and power output calculators for residential and small commercial wind energy systems.
Geothermal
Geothermal heat pump sizing and savings calculators.
Heating & Heat Pumps
Air-source heat pump cost, savings and sizing calculators for residential heating.
Data and assumptions across categories
RenewableCalc keeps formulas and source labels visible so calculator pages can be reviewed before the result is trusted. Common references include utility-bill math, EIA residential electricity data, NREL/PVWatts-style solar assumptions, IRS incentive guidance, EPA-style vehicle efficiency, and user-supplied quote inputs.