Mortgage Calculator
Monthly payment, total interest, payoff date and a full amortisation schedule — with tax, insurance and PMI kept separate, the way Calculator.net does it.
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How it works
Monthly payment M = P·r(1+r)ⁿ / ((1+r)ⁿ − 1), where r = annual rate ÷ 12 and n = months. Each month: interest = balance × r, principal = M − interest. If the rate is 0%, M = P ÷ n.