Full Amortization Schedule
Period-by-period payment / principal / interest / balance from loan amount, rate, and term. Optional extra-principal accelerates payoff. Reports total interest, total paid, months saved, and three sample rows.
Formula and source
Monthly P&I = (P * r) / (1 - (1 + r)^-n) where r = APR/12 and n = term in months. Per-row: interest = balance * r; principal = payment - interest + extra; balance = balance - principal; loop until balance <= 0 or n reached.
Standard mortgage amortization (closed-form annuity formula). FNMA Single-Family Selling Guide §B2-1.2 (loan term and amortization). 12 CFR §1026.18 (truth-in-lending payment schedule disclosure).
Audience
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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.