calcs.homes
calcs.homes
Enter your system size and installed cost per watt, plus any tax credit, rebate, or incentive percentage you qualify for — incentive rates change and vary by location, so enter your own current figure rather than trusting a hardcoded default.
Estimate only — confirm current incentive eligibility with a tax professional or installer.
Gross cost multiplies your system size in kW by 1,000 to get watts, then multiplies that by your installed cost per watt. Incentive amount is gross cost multiplied by your incentive percentage, and net cost subtracts that amount from the gross figure — a straightforward percentage-off calculation rather than anything more complex like tax-bracket modeling.
Cost per watt is the standard way solar installers quote pricing, since it scales cleanly across system sizes from a small rooftop array to a large installation. The incentive percentage isn't pre-filled with a fixed number on purpose — federal tax credits, state rebates, and utility programs change from year to year and vary by location, so using your own current rate avoids a stale or misleading estimate.
US residential solar typically runs $2.50-$3.50 per watt installed before incentives, so a 6 kW system lands around $15,000-$21,000 gross. Local permitting, roof type, and equipment choice all shift this.
Check current federal, state, and utility program rates for your location and year — they change, so this calculator doesn't assume a figure for you. A tax professional or local installer can confirm what you currently qualify for.