Personal Loan Calculator
See the monthly payment, total interest, and full amortization schedule for a fixed-rate personal loan — and how much faster extra payments clear the balance.
What a personal loan actually is
A personal loan is an unsecured, fixed-rate installment loan: you borrow a lump sum, agree to a fixed interest rate, and repay it in equal monthly payments over a set term that is usually somewhere between two and seven years. "Unsecured" means you are not pledging a house or a car as collateral — the lender is relying on your promise to repay and on your credit history, which is exactly why the rate is driven so heavily by your credit profile. This calculator takes the three pieces that define the loan and turns them into a clear picture of what it costs.
People reach for personal loans for a wide range of reasons: consolidating higher-rate credit card debt, covering a medical bill, financing a home repair, paying for a wedding or a move, or handling an emergency expense without resorting to a card. Because the payment is fixed and the loan has a defined end date, a personal loan can bring order to debt that would otherwise revolve indefinitely — provided the rate is reasonable for your situation.
How to use this calculator
Enter the loan amount you want to borrow, the APR the lender quoted, and the term in years. The tool returns a fixed monthly payment, the total interest over the life of the loan, a payoff date, and a downloadable schedule that splits every payment into principal and interest. An optional extra-payment field shows how paying a little more each month shortens the loan and reduces total interest.
How the payment is calculated
Personal loans are fully amortizing, so the math is the same standard amortization formula used for mortgages and car loans: M = P · r / (1 − (1 + r)^−n), where P is the amount borrowed, r is the monthly rate (APR ÷ 12), and n is the number of monthly payments. Each month the interest due on the current balance is taken first, and the remainder reduces the principal. Because the balance falls over time, the interest portion of each payment shrinks while the principal portion grows — which is why the early months feel like slow progress and why extra payments early in the loan are so effective.
Why APR is usually higher than the stated rate
Many personal loans carry an origination fee, often a percentage of the amount borrowed, that the lender deducts from the funds before they reach you or adds to your balance. The interest rate describes only the cost of borrowing the principal, but the APR folds in that origination fee and certain other charges, so it reflects the true annual cost of the loan. This is why a loan advertised with a low headline rate can still be expensive once fees are included. Whenever you compare offers, compare them by APR, not by the rate alone, and treat a fee-free loan at a slightly higher rate as potentially cheaper than a low-rate loan with a hefty origination fee.
A worked example
Imagine borrowing $15,000 at a hypothetical 12% APR over five years. The monthly payment would be about $334, and you would pay roughly $5,000 in interest across the term. If a 2% origination fee were deducted, you would receive only $14,700 in hand while still repaying based on the full balance — which is precisely the cost that APR is meant to capture. Shortening the term to three years would lift the payment to about $498 but cut total interest to roughly $2,900.
How your credit score drives the rate
Because the loan is unsecured, lenders price it almost entirely on perceived risk, and credit score is the headline measure of that risk. Borrowers are generally sorted into tiers, and each step down typically adds to the rate you are offered. The pattern looks like this:
| Credit tier | Typical rate level | What lenders see |
|---|---|---|
| Excellent | Lowest available rates | Long, clean history; low utilization |
| Good | Modestly higher | Reliable payer, minor blemishes |
| Fair | Noticeably higher | Some late payments or high balances |
| Poor | Highest rates, or declined | Recent delinquencies, thin file |
Tiers and rate levels are illustrative and vary by lender and over time.
Personal loan vs credit card, and other tips
A credit card is revolving, variable-rate debt with no fixed payoff date, while a personal loan is a fixed-rate installment loan that ends on a schedule. For a planned, one-time expense, the personal loan's structure and typically lower rate usually win; for small, flexible spending you pay off quickly, a card may be fine. Lenders also weigh your debt-to-income ratio — your monthly debt payments divided by your gross monthly income — because it signals whether you can absorb another payment. Common mistakes to avoid:
- Comparing by monthly payment instead of APR. A lower payment often just means a longer term and more interest.
- Ignoring the origination fee. It can make a "low-rate" loan the more expensive option.
- Borrowing more than you need. You pay interest on every dollar, used or not.
- Stretching the term to lower the payment. Cheaper monthly, costlier overall.
Most reputable lenders charge no prepayment penalty, so paying extra is a reliable way to save — add an extra amount above to see the effect.
Frequently asked questions
How is the monthly payment calculated?
It uses the standard amortization formula with your loan amount, the monthly rate (APR ÷ 12) and the number of payments. Each month the interest due on the remaining balance is charged first, and the rest of the payment reduces the principal. Because the payment is fixed, the split shifts toward principal as the loan ages.
What's the difference between the interest rate and APR?
The interest rate is only the cost of borrowing the principal. APR also includes certain fees, most commonly the origination fee, so it represents the true annual cost of the loan. Always compare offers by APR, because a low advertised rate paired with a large fee can be more expensive than a slightly higher rate with no fee.
What is an origination fee?
It is an upfront charge, often a percentage of the amount borrowed, that the lender deducts from your funds or adds to your balance to cover processing the loan. It reduces the cash you actually receive while you still repay the full amount, which is why it pushes the APR above the stated interest rate.
How does my credit score affect the rate?
Heavily. Because a personal loan is unsecured, the lender prices it on the risk that you might not repay, and your credit score is the main signal of that risk. Stronger scores unlock lower rates, while each tier down generally adds to the rate or can lead to a declined application.
Is a personal loan better than a credit card?
For a planned, one-time expense it usually is, because the rate tends to be lower and the fixed term forces the balance to zero on a set date. A credit card's flexibility suits small, short-lived spending, but its variable rate and open-ended balance make it an expensive way to carry larger debt.
Can I pay it off early without a penalty?
Most reputable lenders charge no prepayment penalty, so paying extra is usually free money saved. Every additional dollar goes straight to principal, shrinking the balance that interest is charged on and shortening the loan. Confirm the no-penalty terms in your agreement before relying on it.
Last updated: July 2026 · How we calculate
BriskToolbox provides estimates for general information only and is not financial advice.