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Online Interest Rate Calculator
Find the interest rate on a loan from its amount, term, and monthly payment, with total payments and interest. Free and instant.
Result
Interest Rate (%): 3.74
Total Payments ($): 120,000.00
Total Interest Paid ($): 20,000.00
Interest
Principal
Balance
0 yr
5 yr
10 yr
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What Is This Tool?
The Interest Rate Calculator works out the interest rate implied by a loan when you already know the amount, the term, and the monthly payment. It searches for the rate that makes those numbers fit, then shows the total amount paid and the total interest, along with charts of the principal and interest split and the falling balance. The results are estimates to help you plan and are not financial advice. You can download the result as a PDF.
How to Use This Tool?
- Enter the loan amount and the term in years.
- Enter the monthly payment you make or expect to make.
- Click Calculate to see the interest rate and totals.
- Click Download Result as PDF to save a copy.
Key Features
- Finds the interest rate from a loan amount, term, and monthly payment.
- Shows the total amount paid over the loan.
- Shows the total interest paid.
- Charts the principal and interest split and the balance over time.
- Download the result as a PDF.
Examples
- A 100,000 loan over 10 years with a 1,000 monthly payment implies a rate of about 3.74%.
- Over that term the total paid is 120,000.00.
- That makes the total interest 20,000.00.
- Raising the monthly payment for the same loan would lower the implied rate.
Common Use Cases
- Estimating the rate behind a quoted monthly payment.
- Comparing loan offers that show payments but not rates.
- Checking whether a payment plan implies a reasonable rate.
- Understanding how much of a payment goes to interest.
- Planning a budget around a known monthly payment.
Tips & Best Practices
- Make sure the monthly payment is enough to cover the loan over the term.
- Enter the term in years, matching how the loan is described.
- Treat the rate as an estimate, since lenders may compute it differently.
- Try a higher payment to see how the implied rate falls.
- Remember the result excludes fees and other charges.
Limitations
- Results are estimates for planning and are not financial advice.
- It assumes a fixed rate and equal monthly payments.
- It does not include fees, taxes, or other charges.
- The monthly payment must be high enough to repay the loan over the term.
Frequently Asked Questions
- What does this calculator find?
- It finds the interest rate implied by a loan amount, term, and monthly payment.
- How does it find the rate?
- It searches for the rate that makes the standard loan payment match the monthly payment you entered.
- Why does it say the payment is too low?
- If the total of all payments is less than the loan amount, the payment cannot repay the loan, so no valid rate exists.
- Can I save my result?
- Yes. Click Download Result as PDF to save the rate and totals as a file.
Key Terminology
- Interest rate
- The yearly percentage charged for borrowing the money.
- Principal
- The original amount borrowed, before interest.
- Monthly payment
- The amount paid toward the loan each month.
- Loan term
- The length of time over which the loan is repaid.
- Total interest
- All the interest paid over the life of the loan.