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Solar payback, insulation, EV charging, and energy-savings estimates for homes and small projects.
A short list of high-use tools in this category.
Utilities
Estimate monthly and annual natural gas bills from therms, CCF, or m³, energy rates, and fixed charges.
Transportation
Compare total cost of ownership for gasoline and electric vehicles using purchase price, fuel, energy, maintenance, insurance, and incentives.
Storage
Estimate minimum and recommended nominal battery kWh for backup runtime from average load, efficiency, DoD, and safety margin.
Solar
Estimate fixed solar panel tilt and true azimuth from latitude with annual or seasonal rule-of-thumb modes.
Carbon
Estimate annual and monthly carbon tax cost from $/metric ton CO₂e using emissions or a gasoline illustration.
Carbon
Estimate CO₂e from air travel using one-way distance, trip type, passengers, trips per year, and adjustable kg CO₂e per passenger-mile and radiative forcing.
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