Decision Tools
Use calculators before you spend money on a home energy project
Watt Wise tools are built for practical first-pass planning. Start with your own bill, mileage, and rate assumptions so you can pressure-test claims before you compare quotes.
Best Use Cases
- Check rough project economics before you contact an installer.
- Compare different assumptions without rebuilding a spreadsheet.
- Share a scenario link with a partner or contractor for faster decisions.
Solar Tool
Solar Payback Calculator
Estimate recommended system size, upfront cost, first-year savings, and simple payback before you request quotes.
EV Charging Tool
EV Charging Cost Calculator
Estimate monthly charging cost, time-of-use savings, and how home charging compares with a gas vehicle.
Efficiency Tool
Bill Savings Calculator
Estimate how much a mix of efficiency upgrades and rate-plan changes could reduce your monthly bill.
What makes these useful
Each tool uses plain-language inputs so you can get to a planning answer without exporting a utility bill into a spreadsheet.
Every calculator can be paired with related guides, which is the right next step once the rough economics look good.