Loan Calculator

Enter the terms. See the payment, the total interest, and the first year of the schedule.

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The ledger
Monthly payment $0
Number of payments 0
Total principal $0
Total interest paid $0
Total cost of loan $0
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How the loan calculator works

This tool uses the standard amortized-loan formula banks use to set a fixed monthly payment: a payment amount that stays the same every month, but where the mix of principal and interest inside it changes over time. Early payments are mostly interest; later ones are mostly principal.

M = P × r × (1 + r)ⁿ / ((1 + r)ⁿ − 1)
P = loan amount, r = monthly interest rate, n = number of payments

What "extra monthly payment" does

Any amount you add above the required payment goes straight to principal. Because interest is calculated on the remaining balance each month, a smaller balance means less interest the following month too — which is why even a modest extra payment can shorten a loan by months or years and cut total interest by a meaningful amount.

What this estimate doesn't include

Origination fees, prepayment penalties, and rate changes on variable-rate loans aren't factored in. If your loan has any of those, treat this as a starting estimate rather than the exact number your lender will quote.

What's a good interest rate for a personal loan?

It depends heavily on credit score, loan term, and lender. Rates for well-qualified borrowers are typically lowest; shorter terms and strong credit history usually bring the rate down further. Comparing multiple offers is the most reliable way to know what's good for your situation.

Does paying extra always save money?

On a standard amortized loan with no prepayment penalty, yes — extra payments reduce the principal balance faster, which reduces the interest charged in every subsequent month. Check your loan agreement for prepayment penalties first.

Why does my early payment barely touch the principal?

Interest is charged on the outstanding balance, which is largest at the start of the loan. As the balance shrinks, less of each payment goes to interest and more goes to principal — this is normal amortization behavior, not an error.

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