Personal Loan Calculator for Credit Card Debt

A personal loan calculator for credit card debt estimates the fixed monthly payment and total interest if you borrow enough to pay off a card balance. Enter the loan amount, annual percentage rate (APR), and term to see the estimated payment and interest; compare those figures with your current card’s costs using the rate and payment details from your statements.

Formula

The calculator treats the borrowed balance as a fixed-rate installment loan with equal monthly payments. It calculates the payment using:

• Monthly payment: P × r ÷ [1 − (1 + r)⁻ⁿ]
• Total interest: (monthly payment × n) − P

P is the loan amount in dollars; APR is the annual percentage rate in percent; r is the monthly rate, APR ÷ 1,200; and n is the number of monthly payments, years × 12. The payment is rounded to cents, and total interest uses that rounded payment. This is a mathematical estimate, not a lender quote.

Worked Example

Using the default inputs—$20,000, an 8% APR, and five years—the monthly rate is 8 ÷ 1,200 = 0.0066667, and the term is 5 × 12 = 60 payments.

• Payment = 20,000 × 0.0066667 ÷ [1 − (1.0066667)⁻⁶⁰] = approximately $405.53 per month.
• Total of payments = $405.53 × 60 = $24,331.80.
• Estimated total interest = $24,331.80 − $20,000 = $4,331.80.

These figures describe the calculator’s fixed-payment assumptions. A lender’s actual payment or total cost can differ if the quoted loan includes fees, uses different payment dates, or has other terms.

How to Use the Estimate for Card Debt

Use the amount you would actually borrow to cover the balances being consolidated. If you intend to include a lender fee in the borrowing, account for it in the amount only after confirming how that fee is charged; the calculator does not determine fees or add them automatically. For multiple cards, add the balances you plan to repay, rather than entering each card’s credit limit.

Enter the offered APR and repayment term from a loan disclosure or quote, not an assumed market rate. The APR is an annualized cost figure, while the formula converts it to a monthly rate by dividing by 12 and converting percent to a decimal. The displayed payment is the same each month under the model. Early in repayment, a larger share generally goes toward interest; later, more goes toward principal.

To make a useful comparison, check the calculator’s payment and total interest against the card balances, APRs, required payments, and any planned payoff schedule. A lower monthly payment by itself does not establish a lower overall cost: extending repayment can mean paying interest for more months. Conversely, a shorter term raises the scheduled monthly payment even when it reduces the number of months interest accrues.

What the Result Does and Does Not Show

The total-interest output is the estimated interest over the full stated term if every payment is made as scheduled. It is not the total amount paid; add the original principal to interest to get the modeled total payments. In the example, that total is $24,331.80.

This calculator does not model revolving card balances, changing card APRs, new purchases, late payments, promotional periods, or different payment amounts. It also does not include a loan origination fee, other charges, or a payoff amount that differs from the balance you enter. Card interest and loan interest may be calculated under different account terms, so use the relevant statements and lender disclosures when comparing actual figures.

A common misconception is that moving a card balance into a personal loan automatically eliminates debt or reduces its cost. It changes how the debt is repaid; the loan still has to be paid, and additional card spending can leave a borrower with both a loan balance and renewed card debt. The calculator cannot predict future spending or determine whether a borrower qualifies for a loan.

Common Comparison Issues

• Comparing payment amounts alone: Compare total payments and interest as well as monthly payment, and account for the different payoff periods.
• Using the wrong balance: The amount required to clear a card on a particular date may differ from the balance shown earlier. Confirm the current payoff figure with the card issuer.
• Leaving out costs: The calculator has no fee input, so its interest result does not include fees or other charges.
• Rounding: The model rounds the monthly payment to cents. Real payment schedules can have a slightly different final payment because of lender-specific rounding and dates.
• Assuming the APR is guaranteed: A sample APR is only an input for illustration. Use the actual disclosed figure for a meaningful estimate.

Assumptions

• The APR remains fixed throughout the loan term.
• Payments are equal, made monthly, and begin according to a regular payment schedule.
• Interest is modeled monthly at APR ÷ 12; the calculation does not reproduce every lender’s day-count or rounding method.
• Fees, taxes, insurance, PMI, and escrow are not included. No fees or card-account charges are represented by an input.

Frequently Asked Questions

Can a personal loan pay off credit card debt?
A personal loan can be used to repay card balances if the loan proceeds and account terms allow it. This calculator only estimates the loan payment and interest; it does not confirm eligibility, lender terms, or whether a particular transaction is permitted.

Does consolidating credit card debt always save interest?
No. The result depends on the loan APR, term, fees, and the card balances’ costs and payoff timing. Compare the complete costs using actual account and loan disclosures rather than relying on the monthly payment alone.

Should I enter my card balance or credit limit?
Enter the amount you plan to borrow, usually based on the balances to be repaid plus any amount actually financed. A credit limit is not the debt balance and should not be used as a substitute.

Why can a longer loan term lower the payment but increase interest?
Spreading repayment across more months reduces the scheduled amount due each month, but the unpaid balance remains outstanding for longer. With interest accruing during that period, total interest can rise.

Does this calculator include loan fees?
No. It estimates principal and interest from the entered amount, APR, and term. Check the lender’s disclosure for fees and use the actual financed amount and terms when available.

This result is an estimate, and the lender’s disclosure gives the exact figures.

Related

• Credit Card Debt Budget Calculator: Plan a Payoff
• Business Credit Card Debt Calculator: Estimate Payoff
• Credit Card Debt Amortization Calculator and Payoff Time

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