Loans
Monthly Loan Payment Explained: How Your Payment Is Calculated
A monthly loan payment calculator turns three numbers — how much you borrow, the interest rate and the term — into one fixed payment. This guide explains what happens inside that payment in plain words, walks through a $25,000 example and shows how the term changes your cost. Try your own loan in the [Loan Calculator](/calculators/loan-calculator).
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Amortization in plain words
Most personal, auto and student loans are amortizing loans. Each month you pay the same amount. Part of it pays the interest charged that month, and the rest lowers your balance (the principal). Because the balance shrinks, next month's interest is a little smaller and more of your payment goes to principal. By the last payment, the balance reaches zero.
The monthly loan payment formula
M = P × r × (1 + r)^n ÷ ((1 + r)^n − 1)
- M
- Monthly payment
- P
- Amount borrowed (principal)
- r
- Monthly interest rate (APR ÷ 12)
- n
- Number of monthly payments
You do not need to solve this by hand — a monthly loan payment calculator does it instantly. Knowing the parts helps you see which lever matters most.
Worked example: $25,000 at 8% APR for 5 years
Worked example
Monthly loan payment calculation
- Principal: $25,000
- Monthly rate: 8% ÷ 12 ≈ 0.6667%
- Number of payments: 5 years × 12 = 60
- Monthly payment: about $506.91
- First month: interest ≈ $166.67, principal ≈ $340.24
- Total paid over 60 months: about $30,415
You pay about $5,415 in interest on top of the $25,000 you borrowed.
Loan term comparison: 3 vs 5 vs 7 years
| Term | Monthly payment | Total paid | Total interest |
|---|---|---|---|
| 3 years (36 payments) | $783.41 | $28,203 | $3,203 |
| 5 years (60 payments) | $506.91 | $30,415 | $5,415 |
| 7 years (84 payments) | $389.66 | $32,731 | $7,731 |
Stretching from 3 to 7 years cuts the payment by almost $400 a month, but more than doubles the interest. Pick the shortest term whose payment fits comfortably in your budget.
What changes your monthly loan payment
Interest rate (APR)
A higher APR raises both the payment and total interest. APR also includes some fees, so compare offers by APR, not just the rate.
Loan amount
Borrowing less is the simplest way to pay less. A larger down payment on a car does exactly this.
Extra payments
Paying extra toward principal shortens the loan and cuts interest, as long as your lender has no prepayment penalty. The Amortization Calculator shows the month-by-month effect.
For personal loans, also see how to calculate EMI for a personal loan — EMI is the same fixed monthly payment.
Run your own numbers
Calculate monthly payments and total interest for any fixed-rate loan.
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