Calchy.
80 answers

Finance - loan payment

Direct answers to every common question in this cluster. Each page has the computed value, the formula, and a live converter.

Quick reference

Monthly loan payment is determined by three inputs: principal (amount borrowed), APR (annual interest rate), and term (years). The formula assumes equal monthly payments over the full term — standard amortization. Each payment covers more interest at the start and more principal as the loan matures.

Formula
M = P · r · (1 + r)ⁿ / ((1 + r)ⁿ − 1) where r = APR/12 and n = years × 12

Every answer in this topic