How a personal loan works
A personal loan is an unsecured installment loan: you get a lump sum, then repay it in equal monthly payments over a fixed term, usually two to seven years. Banks, credit unions and online lenders offer them for debt consolidation, home repairs, medical bills, moving costs and other large expenses.
Two numbers decide what it costs you: the interest rate, which sets the payment, and the origination fee, which many lenders charge upfront. This calculator handles both, so you see the payment, the APR and how much cash actually reaches your account.
The formulas
The monthly payment uses the standard amortization formula:
P = loan balance · r = yearly interest rate ÷ 12 · n = number of monthly payments
The origination fee changes either the money you receive or the balance you owe:
Fee added to the balance: P = cash received × (1 + fee %)
To receive a set amount with the fee taken out: P = cash needed ÷ (1 − fee %)
The APR is the yearly rate at which your payments are worth exactly the cash you received. There is no closed-form formula for it; lenders, and this calculator, solve for it numerically using the actuarial method in Regulation Z. The CFPB requires lenders to show the APR on your loan disclosure precisely because it lets you compare loans with different fees.
Worked example 1: $15,000 with a 5% fee
You are offered $15,000 at 12% for 3 years, with a 5% origination fee deducted from the loan.
- Monthly payment: 15,000 × 0.01 ÷ (1 − 1.01^−36) = $498.21
- Fee: 5% × $15,000 = $750, so you receive $14,250
- Total interest over 36 months: $2,935.73
- Total cost of borrowing: interest + fee = $3,685.73
- APR: the rate at which 36 payments of $498.21 are worth $14,250 = 15.61%
The payment is the same as a fee-free loan at 12%, but you have $750 less to spend. That is why the APR, not the interest rate, is the fair number to compare.
If the lender added the fee to your balance instead, you would receive the full $15,000 but owe $15,750. The payment rises to $523.13 and the APR is 15.43%, slightly lower because the fee is spread over a larger amount you actually received.
Worked example 2: borrowing enough to cover the fee
You need $10,000 in hand to pay a contractor. The best offer is 14% for 4 years with a 6% origination fee taken from the loan.
- If you apply for $10,000, you receive only $9,400.
- Apply instead for $10,000 ÷ 0.94 = $10,638.30. The fee is $638.30 and $10,000 reaches your account.
- Payment: $290.71 a month for 48 months
- Total interest: $3,315.65, plus the fee, makes $3,953.95 of borrowing cost
- APR: 17.42%
Choose Amount I need in hand above and the calculator does this gross-up for you.
Worked example 3: picking the term
Here is the $15,000, 12%, 5%-fee loan from example 1 over different terms:
| Term | Monthly payment | Total interest | Interest + fee | APR |
|---|---|---|---|---|
| 2 years | $706.10 | $1,946.45 | $2,696.45 | 17.23% |
| 3 years | $498.21 | $2,935.73 | $3,685.73 | 15.61% |
| 4 years | $395.01 | $3,960.36 | $4,710.36 | 14.78% |
| 5 years | $333.67 | $5,020.00 | $5,770.00 | 14.28% |
| 7 years | $264.79 | $7,242.44 | $7,992.44 | 13.71% |
Notice two things. The APR falls as the term gets longer, because the one-off fee is spread over more years. But the total cost rises steeply. A lower APR on a longer loan does not mean a cheaper loan; compare total cost too.
How much an origination fee adds to the APR
APR on a $10,000 loan at a 12% interest rate:
| Origination fee | 2 years | 3 years | 5 years |
|---|---|---|---|
| 0% | 12.00% | 12.00% | 12.00% |
| 1% | 13.02% | 12.70% | 12.44% |
| 3% | 15.09% | 14.13% | 13.35% |
| 5% | 17.23% | 15.61% | 14.28% |
| 8% | 20.55% | 17.90% | 15.74% |
| 10% | 22.86% | 19.49% | 16.75% |
A fee-free loan at 14% can be cheaper than a 12% loan with a 5% fee, especially over two or three years.
Is a personal loan right for debt consolidation?
Personal loans are often used to pay off credit cards. Paying $10,000 of card debt at 22% with fixed payments of $381.90 over three years costs $3,748.56 in interest. The $15,000 example above, with its fee, costs a similar amount for 50% more money, so a good personal loan offer can save a lot. It only works if:
- the APR including fees is clearly lower than your card rates,
- you can afford the fixed payment every month, and
- you stop running the cards back up.
Check your overall debt load with the debt-to-income ratio calculator before you apply. Lenders use the same ratio.
Tips for a cheaper personal loan
- Prequalify with several lenders. Many lenders show your rate with a soft credit check that does not affect your score. Compare the APRs side by side.
- Ask how the fee is charged. Taken from the loan, added to the balance, or none at all. The APR calculator handles any fee setup if a lender quotes something unusual.
- Choose the shortest term you can comfortably afford. You can always pay extra, but you cannot easily shorten a term later.
- Pay extra when you can. Most personal loans have no prepayment penalty. On example 1, an extra $100 a month ends the loan in 30 months instead of 36 and saves $580.39 of interest. The fee is not refunded, though.
- Set up autopay. Some lenders cut the rate slightly for automatic payments.
Common mistakes
- Comparing interest rates instead of APRs. Two loans at 12% can have very different costs if one has a 6% fee.
- Forgetting the fee reduces your cash. If you need exactly $10,000, borrowing $10,000 with a deducted fee leaves you short.
- Stretching the term to hit a payment. It lowers the monthly bill but can double the interest.
- Ignoring how payments fit your budget. A missed payment adds late fees and can hurt your credit for years.
How this differs from our other loan tools
The general loan calculator covers any installment loan, with weekly and biweekly payment options. This page is built around the way personal loans are actually sold: a percentage origination fee, the APR it creates, and the amount you need to apply for. For loans in India or Pakistan, the EMI calculator uses local conventions. For a payment table on any loan, see the amortization calculator.