How to use the loan calculator
Enter the amount you’re borrowing, the annual interest rate (APR), and how long you’ll take to repay it. The calculator returns your fixed monthly payment, the total interest you’ll pay over the life of the loan, and a year-by-year breakdown of how the balance falls. It works for any fixed-rate installment loan — personal loans, student loans, medical financing, or debt-consolidation loans.
The formula
Payments use the amortization formula M = P · r · (1+r)ⁿ / ((1+r)ⁿ − 1) — the same math banks use — where P is the amount borrowed, r is the monthly rate, and n is the number of months.
Worked examples
| Loan | Rate / term | Monthly payment | Total interest |
|---|---|---|---|
| $5,000 | 12% · 3 yr | $166.07 | $979 |
| $10,000 | 10% · 5 yr | $212.47 | $2,748 |
| $20,000 | 9.5% · 5 yr | $420.04 | $5,202 |
| $20,000 | 9.5% · 3 yr | $640.66 | $3,064 |
Notice the last two rows: the same $20,000 loan repaid over 3 years instead of 5 costs $220 more each month but saves $2,138 in interest. The term you choose matters as much as the rate you’re offered.
Interest rate vs. APR
The interest rate is the cost of borrowing the principal. APR (annual percentage rate) also folds in certain fees such as origination charges, so it’s usually a little higher and is the better number for comparing offers side by side. Enter the APR here for the most realistic result.
What’s a good rate?
Personal loan rates depend heavily on your credit profile. As a rough map: excellent credit often sees single-digit to low-teens APRs, average credit lands in the mid-teens to low twenties, and weaker credit can be quoted 25–36%. Because the spread is so wide, prequalify with at least three lenders — prequalification uses a soft credit pull, so comparing offers doesn’t hurt your score.
How to pay less interest
Four levers, all visible in the calculator above: choose a shorter term; make extra principal payments (interest is charged on the remaining balance, so early principal reduces every future charge); refinance if your credit has improved since you took the loan; and watch for origination fees (often 1–8% deducted up front) that can make a low advertised rate more expensive than it looks.
When a personal loan makes sense
Fixed-rate personal loans shine for consolidating credit-card debt (a fixed 12% beats a revolving 24%), one-off necessary expenses, and situations where a predictable payment and a firm payoff date keep you disciplined. They make less sense for ongoing spending, or when the payment doesn’t fit your budget — compare strategies with the debt payoff calculator and check what fits with the budget calculator.
Frequently asked questions
What's the monthly payment on a $10,000 loan?
At 10% APR over 5 years, about $212 a month with $2,748 total interest. A 3-year term raises the payment to roughly $323 but cuts total interest to about $1,616.
What's the difference between interest rate and APR?
The interest rate is the cost of borrowing the principal. APR includes certain fees, so it's usually slightly higher and is the better figure for comparing loans. Enter the APR here for the most realistic result.
What is a good APR for a personal loan?
It depends on your credit. Excellent credit commonly sees single-digit to low-teens APRs; average credit mid-teens to low twenties; weaker credit 25–36%. Always compare at least three prequalified offers.
Does checking my rate hurt my credit score?
Prequalification uses a soft credit pull, which does not affect your score. Only a full application triggers a hard inquiry, and rate-shopping several lenders within a short window is typically treated gently by scoring models.
Can I pay my loan off early?
Usually yes, and it saves interest since interest accrues on the remaining balance. Most personal loans have no prepayment penalty, but check your agreement — a few lenders charge one.
What are origination fees?
An upfront charge, often 1–8% of the loan, deducted before you receive the money. A $10,000 loan with a 5% origination fee only pays out $9,500 — factor this in when comparing offers, or use the APR, which includes it.
How can I pay less interest?
Choose a shorter term, make extra payments toward principal, or secure a lower rate. Because interest is charged on the remaining balance, paying down principal early reduces every future interest charge.
Does this work for student loans?
Yes — for any fixed-rate loan with regular monthly payments. Federal student loans on income-driven plans vary with income, so this models the standard fixed repayment instead.