Installment Loan Calculator: Monthly Payments by APR

The fixed monthly payment, the total of payments, and the interest behind them, at any APR and term.

Above the payday ceiling, credit is priced in APR and repaid in fixed monthly payments, and this calculator prices that structure. Enter the amount, the APR, and the term in months. The monthly payment comes from the standard amortization formula; the total of payments and the total interest show what the borrowing costs end to end.

A worked example sits in the defaults: $1,300 at 130% APR over six months produces a $305.82 monthly payment, $1,834.89 total, of which $534.89 is interest. Drop the APR to 36% and the payment falls to $240 with $1,440 total. Same principal, same term; the APR is the whole difference, which is why comparing offers on the monthly payment alone is a mistake.

Two honest limits of the tool: it assumes a fixed rate with no origination fee, and it prices what you enter rather than what a lender might bundle into the contract. Use it as the baseline, then read the lender’s own disclosure line by line.

Loan amount ($100-$35,000) APR % (5-225) Term in months (3-24)

Monthly payment

Total of payments

Total interest

The installment hub and the $1,200-$1,400 guide explain how to compare offers by APR.

Ready to see a real offer against these numbers? The request form returns decisions in minutes. Before signing anything, run the paycheck slack check and confirm the payment fits.

Frequently asked questions

How is the monthly payment calculated?

With the standard amortization formula: principal times the monthly rate, times compounding growth, divided by the growth minus one. At $1,300, 130% APR, six months, that is $305.82 a month.

What APR should I expect on an installment loan?

Online installment products typically price between 6.63% and 225% APR. Credit-union alternatives cap at 28%, and bad-credit online offers cluster in the triple digits. The spread is enormous, which is why comparing APRs matters.

Can I pay an installment loan off early?

Most state-licensed installment lenders allow prepayment, and an interest-bearing loan saves the remaining interest when you do. The payoff figure is lower than the scheduled total of payments; confirm it in writing.

Why does the term change the total so much?

A longer term lowers the monthly payment but multiplies the months the APR compounds. The same principal at the same APR always costs more in total interest over more months; the payment fits the budget, the total drains it.

Reviewed by Marcus Bell, Reviewer, credit counseling background. Every fee, cap, and formula on this page was checked against the published state rules.

Last reviewed: 2026-09-26