Whether you’re comparing a mortgage, an auto loan, or a personal loan offer, seeing the real monthly payment and total interest cost matters more than the headline interest rate alone.
What Is the Loan Calculator?
Enter a loan amount, annual interest rate, and term, and it instantly calculates your fixed monthly payment, total interest paid over the life of the loan, and total amount paid — using the standard amortization formula lenders use. Optionally view the full month-by-month payment schedule.
How to Use It
- Open the tool at /tools/loan-calculator.
- Enter the loan amount, annual interest rate, and term in years.
- Read the monthly payment, total interest, and total paid instantly.
- Check “Show full amortization schedule” to see the principal/interest split for every single payment.
Key Features
- Standard fixed-rate amortization formula — the same math lenders use.
- Instant recalculation as you adjust any input.
- Full amortization schedule showing principal, interest, and remaining balance per payment.
- Handles 0% interest correctly as a special case.
When to Use This Tool
- Comparing loan offers with different rates or terms side by side.
- Understanding how much of your payment goes to interest early versus late in the loan.
- Estimating total cost of a mortgage, auto loan, or personal loan before applying.
Try It Now
Open Loan Calculator directly, or press ⌘K and type the tool name from anywhere on the site.
Part of the Productivity collection on WebdevToolbox — free, browser-based developer tools with no login required.