How to use the personal loan calculator
- Enter the loan amount you plan to borrow.
- Set the annual interest rate (the nominal rate quoted by the lender).
- Choose the term in months (for example, 36 for a three-year loan).
- Add the origination fee percentage if the lender charges one; the calculator will show the net proceeds you actually receive.
- Optionally add an extra monthly payment to see how much faster you can pay off the loan.
How the Monthly Payment Is Calculated
The monthly payment uses the standard loan formula: PMT = P × r / (1 − (1 + r)^(−n)), where P is the loan amount, r is the monthly rate (annual rate ÷ 12 ÷ 100), and n is the number of months. For a $10,000 loan at 10% annual rate over 36 months, the monthly rate is 0.00833 and the payment works out to about $322.67. This personal loan calculator applies that formula automatically and updates the result instantly as you change any input.
Origination Fee and Net Proceeds
Many personal loans charge an origination fee that is deducted before you receive the money. The fee is calculated as loan amount × fee% ÷ 100. Net proceeds equal the loan amount minus that fee. If you borrow $10,000 with a 3% fee, you receive $9,700 but still repay the full $10,000 plus interest. The calculator shows both the fee dollar amount and the net proceeds so you can compare offers on an equal footing.
True APR vs. Stated Rate
The stated rate does not reflect the fee. The true annual percentage rate (APR) is the internal rate of return on the cash flows: you receive the net proceeds up front, then make the monthly payments. The calculator solves for the monthly rate that equates the two and multiplies it by 12, which is how APR is quoted. With no fee, the APR equals the stated rate. For the $10,000 loan at 10% over 36 months with a 3% fee, the true APR is about 12.11%. This lets you compare loans with different fee structures on a level playing field.
Reading the Amortization Schedule
The schedule shows each month's payment split into principal and interest, plus the remaining balance. Early payments are mostly interest; later payments are mostly principal. The table also reveals the effect of any extra payment you enter: each extra dollar reduces the principal immediately and shortens the loan. You can scroll through the full schedule to see the exact payoff date and the interest saved by paying extra.
Common Mistakes and Edge Cases
Forgetting the origination fee leads to underestimating the true cost. Entering a zero interest rate works fine: the payment becomes a simple division. Very large loans (over $1 million) and long terms (30 years) are supported, but the schedule may have hundreds of rows; the tool still runs instantly in the browser. If you enter an extra payment that exceeds the remaining balance, the calculator caps the principal at the balance so the loan ends cleanly.
Practical Use Cases
Use this personal loan calculator when you are shopping for a debt consolidation loan, a home improvement loan, or any unsecured personal loan. Plug in the numbers from each lender's quote to see which offer has the lowest true APR. You can also model how an extra $50 or $100 per month accelerates payoff and reduces total interest. The amortization schedule helps you budget by showing exactly how much principal you will owe at any future date.
Method and sources
Worked example: a $10,000 loan at 10% for 36 months with a 3% origination fee. The monthly payment is 322.67, you receive 9,700.00 after a 300.00 fee, and the true APR (the rate at which the payments are worth what you actually received) is 12.11%. Total interest is 1,616.19.
Method: standard amortization, a month-by-month schedule that applies any extra payment, and an APR found by bisection on the cash flows. The fee is assumed to be deducted from the proceeds, which is the usual structure; some lenders add it to the balance instead. Variable-rate loans, late fees and credit insurance are not modelled.
Worked examples
| Example | Input | Result |
|---|---|---|
| Standard 3-year loan | Loan amount: 15000; Annual interest rate (%): 12; Loan term (months): 36; Origination fee (%): 4; Extra monthly payment (optional): 0 | Monthly Payment: 498.21; Net Proceeds: 14,400.00; Origination Fee: 600.00; True APR: 14.86%; Total Interest: 2,935.73; Total Paid: 17,935.73; Months to Pay Off: 36 |
| Zero-interest loan with fee | Loan amount: 5000; Annual interest rate (%): 0; Loan term (months): 12; Origination fee (%): 2; Extra monthly payment (optional): 0 | Monthly Payment: 416.67; Net Proceeds: 4,900.00; Origination Fee: 100.00; True APR: 3.75%; Total Interest: 0.00; Total Paid: 5,000.00; Months to Pay Off: 12 |
| Aggressive payoff with extra payment | Loan amount: 20000; Annual interest rate (%): 8.5; Loan term (months): 60; Origination fee (%): 3; Extra monthly payment (optional): 100 | Monthly Payment: 510.33; Net Proceeds: 19,400.00; Origination Fee: 600.00; True APR: 10.16%; Total Interest: 3,510.64; Total Paid: 23,510.64; Months to Pay Off: 47 |
FAQ
What is the difference between the stated rate and the true APR?
The stated rate is the nominal interest rate on the full loan amount. The true APR includes the origination fee by measuring the return on the net proceeds you actually receive.
Can I use this calculator for auto loans or mortgages?
Yes, the math is the same, but dedicated tools like the auto loan calculator or mortgage payoff calculator may have extra fields tailored to those products.
Does the calculator account for extra payments?
Enter an extra monthly payment to see how it reduces the principal faster. The schedule will reflect the shortened term and the interest saved.
What if my loan has a variable rate?
This calculator assumes a fixed rate for the entire term. For variable-rate loans, you would need to recalculate when the rate changes.
How accurate is the true APR calculation?
The monthly rate is solved by bisection on the cash flows until it is accurate far beyond the two decimals shown, then multiplied by 12 and shown as an annual percentage.
What does the personal loan calculator show besides the monthly payment?
It shows net proceeds after the origination fee, the true APR, total interest paid, total amount paid, and a full month-by-month amortization schedule.
Is the origination fee taken from the loan or added to it?
This tool deducts it from the amount you receive, so you repay the full loan amount while getting less cash. If your lender rolls the fee into the balance instead, enter the larger balance as the loan amount and set the fee to 0.