Upgrade ROI / Payback

Simple payback and 10-year NPV at user-supplied discount rate.

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Formula and source

Simple payback = capital / annual_savings. NPV = Σ (savings_t / (1 + r)^t) − capital. Discount rate r is user-supplied.

Classical capital-budgeting formulas.

Audience

This tile is built for electricians and the adjacent professions in the Cross-Trade Utilities group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.

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Posture

Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.