Calculate monthly loan payments, total interest, and amortization
Enter the loan amount, interest rate, and loan term. Click Calculate to see your monthly payment, total interest paid, and total cost of the loan.
Key Output — This is the primary number the calculator returns. It represents the answer to the question you asked, calculated using standard financial formulas.
Breakdown Details — These supporting numbers show you how the result was reached. They help you understand what's driving the outcome and where you might adjust your inputs.
What to Look For — Pay attention to how small changes in inputs affect the outputs. The relationship between your inputs and results is where the real insight lives — that's what helps you make better decisions.
Every calculation uses standard financial math — the same formulas banks, lenders, and investment platforms use. The inputs you provide determine the accuracy of the result.
Priya just got a promotion and needs a reliable used car for her commute. She's looking at a $18,500 sedan and has $2,500 saved for a down payment, with a 5-year loan term and an offered interest rate of 6.8%.
"I honestly expected the monthly payment to be closer to $400. Seeing that extra $85 a month I can put toward insurance instead is a relief."
Takeaway: Putting even 10–15% down lowers your monthly payment and saves hundreds in interest over the life of a loan.
The couple wants a $35,000 kitchen remodel and is considering a home equity loan versus a personal loan. Their credit scores qualify them for a 9.2% personal loan over 7 years, while a home equity loan would be 7.5% over 10 years.
"We were leaning toward the home equity loan for the lower monthly payment, but when I saw we'd actually pay $1,500 more in total interest, it made us really reconsider the timeline."
Takeaway: Always compare both the monthly payment and the total interest cost — a longer term can make a lower rate more expensive overall.
Dave has a $27,000 parent PLUS loan at 7.0% with 14 years remaining. He received a $10,000 bonus and is deciding between a lump-sum payment or investing the money. He uses the calculator to model paying $500 extra per month instead.
"I was going to put the whole bonus into the market, but seeing that saving $10,800 in interest is like earning 7% tax-free — I'd have to make over 12% in stocks to match that. I'd rather take the sure thing."
Takeaway: Prepaying a mid-to-high interest loan offers a risk-free return equal to your interest rate — often better after taxes than investing the same money.
See how different inputs affect the result:
| Scenario | Key Input | Result A | Result B |
|---|---|---|---|
| Priya's Car Loan | Down payment $0 vs. $2,500 | $365/mo, $3,400 interest | $315/mo, $2,900 interest |
| Marcus & Elena's Loan | 7.5% for 10 yrs vs. 9.2% for 7 yrs | $415/mo, $14,800 interest | $575/mo, $13,300 interest |
| Dave's Student Loan | Minimum vs. $500 extra/month | 14 yrs, $14,600 interest | 3.7 yrs, $3,800 interest |
| Same Loan, Different Rate | 5% vs. 9% on $20k/60mo | $377/mo, $2,645 interest | $415/mo, $4,900 interest |
A 4 percentage point rate difference on a $20,000 loan costs nearly twice as much in total interest. And extra payments are powerful — they shorten the term dramatically and cut interest costs more than shopping for a slightly lower rate.
Disclaimer: All calculations and scenarios are hypothetical and for illustrative purposes only. They assume constant conditions — real-world results may vary. These calculators are educational tools, not financial advice. Consult a qualified professional before making financial decisions.