Installment Loan Payment Calculator

Test different combinations of loan amounts ($200 to $5,000), repayment terms (6 to 60 months), and APR rates (5.99% to 35.99%) to budget your monthly installments.

$
$200 $5,000
%
5.99% 35.99%
mo
6 Months 60 Months
Estimated Monthly Payment
$72.68
Total Repayment Amount $1,744.32
Estimated Total Interest $244.32
86% Principal 14% Interest
Estimation Disclaimer: This calculation is for informational illustration only and does not constitute a formal quote, credit pre-qualification, or guarantee of terms. Actual payments may vary depending on lender origination fees, payment schedule timing, and final agreement terms.

How Installment Loan Amortization Works

When you take out a fixed-rate installment loan, every monthly payment is divided between paying down the loan balance (principal) and covering the lender's finance fee (interest). Standard amortizing monthly installments are determined by the formula:

M = P × [ r(1 + r)n ] / [ (1 + r)n − 1 ]

Where P is the principal borrowed, r is the monthly interest rate (APR / 12 / 100), and n is the number of scheduled monthly payments.

  • Early Payments: Because your outstanding principal is at its peak, the interest portion of your monthly installment is highest during early months.
  • Later Payments: As regular payments gradually erode the principal, less interest accrues each billing cycle, allowing a larger percentage of your payment to go directly toward eliminating the remaining debt.

Comparing Term Lengths: Short vs. Long Term

Choosing the right term length (6 to 60 months) is a balancing act between monthly affordability and overall cost:

Short Terms (6–18 Mo)

Higher monthly payments, but you become debt-free much faster and pay the lowest total interest over the life of the loan.

Medium Terms (24–36 Mo)

Balanced structure offering manageable monthly installments without excessive cumulative interest accumulation.

Long Terms (48–60 Mo)

Lowest monthly payments for maximum cash-flow breathing room, but results in higher total finance charges.

Read Installment Loans Guide