💵 Personal Loan Calculator: Monthly Payment, Interest and Total Cost
By Shihab Mia · Reviewed by ToolNimba Review Team, Personal finance reviewer · Updated 2026-06-27
This personal loan calculator gives an estimate for a standard fixed-rate amortizing loan and is not professional financial advice. Your real payment can differ because of fees, the exact APR, the day-count convention your lender uses and any insurance added to the loan. Confirm every figure in your loan agreement before you borrow.
Deducted from your disbursement. You repay the full loan amount.
Loan amount minus origination fee.
First payment split
How your very first monthly payment divides between interest and principal.
| Payment | Goes to interest | Goes to principal | Balance after |
|---|---|---|---|
| Month 1 | - | - | - |
This personal loan calculator turns a loan amount, an APR and a term into the three numbers that actually matter: your fixed monthly payment, the total interest you will pay, and the total cost of the loan from first payment to last. Enter an optional origination fee and it also shows the fee deducted up front and the cash you actually receive. Every result updates instantly in your browser, nothing is sent anywhere, and a first-payment breakdown shows how little of an early payment really chips away at what you owe.
What is the Personal Loan Calculator?
A personal loan is an installment loan: you borrow a fixed amount, usually unsecured, and repay it in equal monthly payments over a set term, most often two to seven years. This personal loan calculator uses the standard amortization formula that every mainstream lender uses to size that level payment, so the monthly figure you see here is the same kind of number a bank, credit union or online lender would quote. Because the payment is constant, the lender first solves for the single amount that clears the balance to exactly zero by the final month.
The payment comes from M = P x r x (1 + r)^n / ((1 + r)^n - 1), where P is the amount you borrow, r is the monthly interest rate (the annual rate divided by 12 and by 100) and n is the number of monthly payments. Inside every payment, the interest part is the current balance times the monthly rate, and whatever is left reduces the principal. Early on the balance is large, so most of the payment is interest and only a little touches the principal. As the balance falls, the split flips and more of each payment goes to principal. That front-loading is exactly why paying a personal loan off early, or even adding a little extra each month, saves more interest than people expect.
APR is where personal loans get confusing, and where this loan payment calculator helps you compare offers fairly. The interest rate sets the monthly charge on the balance, but the APR is meant to fold in mandatory up-front costs such as an origination fee, so two loans with the same rate can have different APRs. In this tool the rate field drives the amortization, while the origination fee is shown separately: the fee is deducted from your disbursement, yet you still repay the full loan amount with interest. That means the effective cost of the cash you actually receive is higher than the headline rate, which is the single most common trap borrowers miss.
The total interest and total cost figures are what separate a good borrowing decision from an expensive one. A longer term shrinks the monthly payment but stretches interest across more months, so the total you repay climbs steadily. A shorter term costs more each month but far less overall. Use this personal loan calculator to test combinations side by side: nudge the term down and watch the monthly payment rise but the total interest drop, or lower the APR and see how much a better credit score could be worth in real dollars before you sign anything.
When to use it
- Estimating the monthly payment on a debt consolidation, home improvement or medical loan before you apply.
- Comparing two loan offers with different APRs and origination fees on equal footing.
- Checking how much total interest a longer term really adds versus a shorter one.
- Working out the real cash you receive after an origination fee is deducted from the loan.
- Deciding whether a personal loan or a credit card balance transfer is cheaper for the same amount.
- Seeing how a better credit score, and the lower APR it earns, would change your total cost.
How to use the Personal Loan Calculator
- Enter the loan amount you want to borrow (the principal).
- Enter the annual interest rate or APR the lender quoted.
- Set the loan term and choose months or years from the dropdown.
- Add an origination fee percent if the lender charges one, or leave it blank.
- Read your monthly payment, total interest, total cost and the cash you actually receive, then use Copy results to save them.
Formula & method
Worked examples
A $15,000 debt consolidation loan at 11.5% APR over 36 months, with a 2% origination fee.
- Monthly rate r = 11.5 / 12 / 100 = 0.0095833
- Number of payments n = 36
- (1 + r)^n = 1.0095833^36 = 1.409724
- M = 15,000 x 0.0095833 x 1.409724 / (1.409724 - 1) = 494.64
- Total of payments = 494.64 x 36 = 17,807.04, so total interest = 17,807.04 - 15,000 = 2,807.04
- Origination fee = 15,000 x 2% = 300.00, so cash received = 15,000 - 300 = 14,700.00 (you still repay the full 15,000 plus interest)
Result: Payment about $494.64, total interest about $2,807.04, total cost about $17,807.04, cash received $14,700.
A $10,000 home improvement loan at 9% APR over 60 months (5 years), with a 3% origination fee.
- Monthly rate r = 9 / 12 / 100 = 0.0075
- Number of payments n = 60
- (1 + r)^n = 1.0075^60 = 1.565681
- M = 10,000 x 0.0075 x 1.565681 / (1.565681 - 1) = 207.58
- Total of payments = 207.58 x 60 = 12,455.01, so total interest = 2,455.01
- Origination fee = 10,000 x 3% = 300.00, so cash received = 9,700.00
Result: Payment about $207.58, total interest about $2,455.01, total cost about $12,455.01, cash received $9,700.
How the term changes the payment and total interest on a $20,000 loan at 10% APR
| Term | Monthly payment | Total interest | Total cost |
|---|---|---|---|
| 24 months | $922.90 | $2,149.56 | $22,149.56 |
| 36 months | $645.34 | $3,232.37 | $23,232.37 |
| 48 months | $507.25 | $4,348.08 | $24,348.08 |
| 60 months | $424.94 | $5,496.45 | $25,496.45 |
| 72 months | $370.52 | $6,677.21 | $26,677.21 |
How the APR changes the payment and total interest on a $10,000 loan over 36 months
| APR | Monthly payment | Total interest | Total cost |
|---|---|---|---|
| 6% | $304.22 | $951.90 | $10,951.90 |
| 9% | $318.00 | $1,447.90 | $11,447.90 |
| 12% | $332.14 | $1,957.15 | $11,957.15 |
| 15% | $346.65 | $2,479.52 | $12,479.52 |
| 18% | $361.52 | $3,014.86 | $13,014.86 |
Common mistakes to avoid
- Comparing loans by interest rate alone. Two loans with the same rate can cost very different amounts once an origination fee is added. Compare the APR, which is designed to fold in mandatory up-front fees, and check the total cost figure, not just the monthly payment.
- Forgetting the origination fee comes out of your cash. A 2% to 8% fee is usually deducted from the loan before it reaches you, yet you still repay the full loan amount with interest. If you need a specific amount in hand, borrow enough to cover the fee, then re-check the payment.
- Choosing the longest term just to lower the monthly payment. Stretching a $20,000 loan at 10% from 24 to 72 months cuts the payment by more than half but roughly triples the total interest. A smaller payment can quietly cost thousands more over the life of the loan.
- Assuming early payments build down the balance quickly. On the first payment of a $15,000 loan at 11.5%, about $143.75 is interest and only the rest reduces principal. Early payments are mostly interest, which is why paying extra in the first year saves the most.
Glossary
- Principal
- The amount you borrow and still owe. Each payment reduces it by its principal portion until the balance reaches zero.
- APR
- Annual percentage rate, the yearly cost of the loan expressed as a percent. It is meant to include mandatory up-front fees so you can compare offers fairly.
- Origination fee
- A one-time charge, often 1% to 8% of the loan, usually deducted from your disbursement before the money reaches you.
- Amortization
- Repaying a loan in equal payments where each one covers the interest due and then reduces the principal.
- Term
- The length of the loan, entered here in months or years and converted to n, the number of monthly payments.
- Total of payments
- The monthly payment multiplied by the number of payments, equal to the principal plus all interest paid.
Frequently asked questions
How does this personal loan calculator work?
It applies the standard amortization formula M = P x r x (1 + r)^n / ((1 + r)^n - 1), where P is the loan amount, r is the monthly rate (APR divided by 12 and by 100) and n is the term in months. From the level monthly payment it then derives the total of payments, the total interest, and the first payment split between interest and principal.
What is a good interest rate on a personal loan?
It depends heavily on your credit. Borrowers with strong credit often see rates in the high single digits, while fair or poor credit can mean rates well above 20%. Use the APR comparison table above to see, in real dollars, how much a lower rate would save on your specific amount and term.
How is the origination fee handled?
The fee is calculated as a percent of the loan amount and is normally deducted from your disbursement, so the cash you receive is the loan amount minus the fee. You still repay the full loan amount with interest, which is why the calculator shows both the fee and the net cash you actually get.
Does a longer term make a personal loan cheaper?
No. A longer term lowers the monthly payment but increases the total interest, because you owe the balance for more months. The calculator makes the trade-off clear: shorten the term to pay less overall, or lengthen it only if you genuinely need a smaller monthly payment.
Will paying off the loan early save money?
Usually yes, because interest is charged each month on the remaining balance, so clearing it sooner cuts the interest in every later month. Check your agreement for a prepayment penalty first, though most reputable personal loans do not charge one.
Is my data sent anywhere when I use this calculator?
No. Every calculation runs entirely in your browser using JavaScript. Nothing you type is uploaded, stored or shared, so you can model real figures privately.
Sources
- What is a personal loan? , U.S. Consumer Financial Protection Bureau
- Personal Loan , Investopedia