About Solar Savings Calculator

Estimate your rooftop solar production, savings, and payback before you talk to an installer

Going solar sounds simple until the quotes arrive: one installer recommends a 7 kW system, another pushes 10 kW, and both promise savings that are hard to check. This Solar Savings Calculator gives you an independent estimate first, before any sales conversation, using the same basic physics every proposal relies on. Pick your state to load a state-average estimate for peak sun hours and residential electricity price, then adjust those numbers to match your actual utility bill and roof. Enter the system size in kilowatts and the quoted cost, and choose whether to apply the 30 percent federal tax credit as a current-law assumption. The calculator then estimates annual production with a standard 0.85 derate for inverter losses, heat, wiring, and soiling, multiplies that production by your rate to estimate annual savings, and works out net cost, simple payback in years, and estimated savings over 25 years. High-rate states can pay back surprisingly fast even with modest sun, while low-rate states with excellent sun may take longer than brochures suggest, which is exactly why seeing both inputs side by side matters. Use the result to compare quotes on equal terms, question outliers, and decide whether a site visit and detailed shade analysis are worth your time.

Who operates this site

Solar Savings Calculator (solarsavings.moneycalcworks.com) is operated by BrightSpan Holdings LLC under the Book AI Studio brand. Book AI Studio builds practical online calculators and tools that give people clear, honest estimates before they make a decision. If you have a question about this site, a correction to suggest, or a problem to report, contact us at admin@bookaistudio.com.

Ready to try it? Open the Run your solar estimate tool.