Solar Panel ROI

A solar ROI calculator determines payback period and long-term return. Typical payback: 6–10 years UK; 5–8 years in sunnier US states

The calculator uses the standard published formula for solar roi. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: Payback = Net cost / Annual electricity savings. Each step in the calculation is shown so you can verify the result manually.