Powerful Tools for
Smarter Energy Decisions
Free, NREL & DOE-aligned calculators and converters to model solar ROI, LCOE, battery sizing, EV TCO, heat pump balance points, and utility tariffs.
100% Free
No sign-up required
Engineering Math
NREL & DOE benchmarks
Privacy First
100% browser-based
Backup Generator vs Home Battery Calculator
Compare 10-year total cost of ownership, outage fuel burn, tax credits, and emissions between standby generators and LFP batteries.
Energy & Power Unit Converter
Convert between kWh, MWh, BTU, MMBtu, Therms, Joules, kW, Horsepower, Tons of Refrigeration, and fuel equivalents.
EV vs Gas Cost Calculator
Compare the annual fuel cost of driving an electric vehicle versus a gas-powered car.
Heat Pump Balance Point Calculator
Calculate your dual-fuel thermal and economic switchover temperature where auxiliary gas or electric heat becomes cheaper than a heat pump.
Home Heating Fuel Cost Comparison
Compare cost per Million BTU ($/MMBtu) and seasonal heating bills across Air-Source Heat Pumps, Natural Gas, Propane, Heating Oil, Electric Baseboard, and Wood Pellets.
Solar Lease vs Buy Calculator
Compare leasing versus buying solar.
Small Calculations,
Big Impact
Every calculation you make brings us closer to a cleaner, more sustainable future.
Explore All Tools