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Loan Calculator

Monthly payment and total interest for any fixed-rate loan. Add an extra payment to see how much faster — and cheaper — payoff gets.

Works for auto loans, personal loans, or any fixed-rate installment loan.

Installment Loan · Terms
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Common questions

How is a loan payment calculated?

With the amortization formula: loan amount × monthly rate ÷ (1 − (1 + monthly rate)^−months). Early payments are mostly interest; later payments are mostly principal.

Do extra payments really help?

Yes — every extra dollar goes straight to principal, which shrinks the balance that interest is charged on. Even $50/month on a typical auto loan can shave months off the term. Confirm your lender applies extras to principal and has no prepayment penalty.

What's the difference between APR and interest rate?

The interest rate is the cost of borrowing the principal; APR includes that rate plus certain fees, expressed annually. For comparing loan offers, APR is the more complete number.