Refinance a Small Personal Loan? Costs and Payment Calculator

You can refinance a small personal loan by taking out a new loan and using it to pay off the existing balance, but the payment calculator below estimates only the new loan’s monthly payment and total interest. Enter the amount to refinance, the new loan’s APR, and its term; compare those estimates with your current payoff amount and remaining costs before drawing conclusions.

Formula

The calculator uses the standard fixed-rate, level-payment loan formula. Monthly payment = P × r ÷ [1 − (1 + r)⁻ⁿ], where P is the new loan principal in dollars, r is the monthly interest rate (APR ÷ 1,200), and n is the number of monthly payments (term in years × 12). Total interest = monthly payment × n − P. The payment displayed here is not rounded to cents inside the formula, so the displayed total-interest figure may differ slightly from a real schedule that rounds every payment to cents.

Enter the amount you would borrow to cover the existing loan payoff, not necessarily its original principal. The APR and term must be figures supplied or confirmed by a lender; the 8% and five-year defaults are example inputs, not market estimates or an offer.

Worked Example

Using the calculator’s default inputs:

• Principal P = $20,000
• APR = 8%, so monthly rate r = 8 ÷ 1,200 = 0.0066667
• Term = 5 years, so n = 5 × 12 = 60 payments
• Payment = 20,000 × 0.0066667 ÷ [1 − (1.0066667)⁻⁶⁰] ≈ $405.53 per month
• Total interest = $405.53 × 60 − $20,000 = $4,331.80, using the displayed rounded payment

The payment is rounded to cents for display. Because the calculator’s total-interest expression uses the unrounded payment value internally, its displayed total may differ by a few cents from the rounded-payment illustration above.

Assumptions

• The interest rate stays fixed for the full term.
• Payments are equal, made monthly, with the first payment one month after borrowing.
• Interest compounds monthly at APR divided by 12.
• The estimate excludes origination or payoff fees, taxes, insurance, late charges, and other costs. It does not model a lender’s exact payment schedule or rounding conventions.

How Refinancing a Small Loan Works

Refinancing replaces one debt with another. The new loan proceeds generally go toward the existing loan’s payoff; any amount that does not cover the payoff and applicable charges may need separate payment. A refinance is not the same as changing the due date or asking the current lender to modify a loan.

For a small balance, fixed fees matter proportionally more. For example, a $100 fee is 2% of a $5,000 balance but 0.5% of a $20,000 balance. A lower APR alone does not establish that refinancing reduces overall cost: the term, fees, payoff amount, and remaining schedule all affect the comparison.

To make a useful comparison, gather the current lender’s payoff quote and its expiration date, the new loan’s written terms and charges, and the number of payments left on the existing loan. A statement balance may differ from the payoff figure because interest can accrue between the statement date and the day the debt is settled.

Compare Total Costs, Not Just the Payment

A longer term can lower the required monthly payment while increasing total interest, because the balance remains outstanding for more months. A shorter term can have the opposite pattern. Compare the new loan’s total scheduled payments plus fees against the cost of completing the current loan from now, not against the amount originally borrowed.

For instance, a borrower who owes $3,000 and has six payments left should compare those remaining payments and any relevant charges with all payments and fees on a proposed replacement loan. Comparing only the old and new monthly payments can obscure the fact that one option runs longer. This calculator helps estimate the proposed loan payment and interest, but it does not calculate the current loan’s remaining cost or include fees. Those figures must be obtained separately and added to the comparison.

Costs, Credit Checks, and Common Problems

Ask for the complete amount due to establish the new loan and whether fees are paid upfront or added to the balance. If a fee is financed, the amount borrowed—and therefore interest—may rise. Check whether the quoted APR reflects the terms you would actually receive, and whether the offer is conditional. A prequalification or estimate may not be a final approval or final contract.

• Using the wrong principal: The old loan’s original amount is not the same as today’s payoff.
• Ignoring fees: A payment calculation without fees can understate the cash required or total borrowing cost.
• Focusing only on monthly payment: A lower payment may result from extending repayment rather than reducing the overall cost.
• Overlooking timing: Keep track of payment due dates and payoff processing so the old account is settled correctly and no payment is missed.

Submitting a full application may involve a credit inquiry, depending on the lender and process. Do not assume a particular score change or approval outcome; ask the lender how it handles inquiries and what information it needs. Verify that the old balance has been paid after the transaction and retain confirmation and account records.

When the Estimate Is Useful—and Its Limits

Use the calculator to see how a stated principal, APR, and term translate into a fixed monthly payment and interest estimate. Try the actual proposed figures, then consider how changing the term affects the payment and interest. The outputs are mathematical estimates, not a quote, approval decision, or recommendation.

The model assumes one disbursement, a fixed APR, monthly payments, and no additional borrowing. It cannot determine a lender’s fees, eligibility terms, exact payoff amount, variable-rate changes, payment dates, or whether a particular contract allows a specific transaction. Review the lender’s disclosure and repayment schedule for those details. This result is an estimate; the lender’s disclosure gives the exact figures.

Frequently Asked Questions

Can you refinance a small personal loan?
It may be possible, depending on the lender’s terms and the borrower’s application. Check whether the available loan amount, costs, and repayment terms apply to the balance you need to pay off.

Does refinancing a personal loan lower the monthly payment?
It can, for example if the new term is longer, but a lower payment does not necessarily mean lower total cost. Compare the full remaining payment totals and fees.

Is it worth refinancing a small personal loan?
The answer depends on the payoff amount, new APR and term, fees, and remaining payments. This calculator estimates payment and interest for the proposed loan; it cannot decide whether refinancing is worthwhile for an individual.

What amount should I enter in the calculator?
Use the amount you would actually need to borrow, based on a current payoff quote and any charges financed into the new loan. Do not assume the original loan amount is still owed.

Does refinancing a personal loan affect credit?
A lender may check credit during an application, but the process and any effects depend on the lender and the person’s circumstances. Ask the lender how it handles credit inquiries; this calculator does not estimate credit effects.

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in p | Loan amount | $ | 20000 | 1 | 100000000
in apr | Interest rate (APR) | % | 8 | 0.01 | 100
in yrs | Loan term | years | 5 | 0.0833 | 50
out pmt | Monthly payment | $ | p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)) | 2
out int | Total interest | $ | pmt * yrs * 12 - p | 2