Core tool
Electricity bill calculator
Estimate monthly and annual electric cost from kWh use, fixed charges, and local cents per kWh.
Open toolHome energy economics, without the spreadsheet fog
Make faster decisions about electricity costs, solar, and heat pumps.
WattNomic turns public energy data into clean calculators and state-by-state cost pages, so homeowners can screen upgrades before chasing quotes.
Public-source data
No account required
Editable assumptions
Trust model
Transparent defaults, visible formulas, practical outputs.
EIA-backed ratesState defaults come from the U.S. Energy Information Administration.
Browser-based toolsCalculators run instantly with no login or personal data.
Decision-ready framingResults are estimates for screening, not hidden sales funnels.
Tools
Start with the numbers that move household energy decisions.
Each calculator ships with a public-data default, then lets users replace assumptions with their bill, quote, or local rate.
Upgrade screen
Solar payback calculator
Compare installed cost, annual production, bill offset, and simple payback for a rooftop solar scenario.
Open toolFuel compare
Heat pump cost comparison
Compare heat delivered by electricity, gas, oil, and propane using editable fuel prices and efficiency assumptions.
Open tool
Explore the dataset
Residential electricity rates by state.
Browse state pages with default rates, monthly bill estimates, solar-value estimates, and regional comparisons. These pages are designed to be useful entry points, not filler.
Open rate indexA utility layer for home energy decisions.
The first release focuses on electricity, solar, and heat pumps. The operating plan is to expand into more datasets and calculators only when usage data shows real demand.