Loan Payment

Monthly payment, total interest, and 12-month amortization.

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Formula and source

Monthly payment M = P × (r × (1+r)^n) / ((1+r)^n − 1) where r = APR / 12 and n = months. Total interest = (M × n) − P.

Classical loan-amortization formula.

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.