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// myloanmath
Loan Calculator
Find your monthly payment, total interest, and total cost for any fixed-rate loan.
Monthly payment
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Uses the standard amortization formula. The final year's numbers may differ by a few cents from a pure formula calculation because real lenders round each monthly payment, and this calculator does too.
How this loan payment calculator works
This loan calculator uses the standard amortization formula lenders use to compute a fixed monthly payment: M = P × r(1+r)^n / ((1+r)^n − 1), where P is the loan amount, r is the monthly interest rate, and n is the number of payments. It correctly handles 0% interest loans as a special case, since the standard formula breaks down mathematically at exactly zero interest.
Frequently asked questions
How is my monthly loan payment calculated?
Using the standard fixed-rate amortization formula, based on your loan amount, annual interest rate, and term. The same math banks and lenders use.
Why does the yearly breakdown show more interest in early years?
Amortized loans front-load interest — in the first year you owe interest on nearly the full balance, so more of each payment goes to interest. As the balance shrinks, more of each payment goes to principal.
Does this work for 0% interest loans?
Yes — it's handled as a special case, since the general loan formula is mathematically undefined at exactly 0% interest.