Personal Loan Payment Calculator and Comparison Guide

A personal loan payment calculator estimates the monthly payment and total interest for a fixed-rate loan from the amount, APR, and term you enter. Use the figures from a lender’s disclosure to compare payment schedules; the results are arithmetic estimates, not an approval decision or a recommendation to borrow.

Formula

The calculator uses the standard fixed-payment loan formula. It finds a monthly payment that covers interest charged each month and repays the starting balance over the selected number of months.

• P is the loan principal, or amount borrowed, in dollars.
• APR is the annual percentage rate entered as a percent, such as 8 for 8%.
• r is the monthly rate, calculated as APR ÷ 1,200.
• n is the term in months, calculated as years × 12.
• Payment = P × r ÷ [1 − (1 + r)⁻ⁿ]. The displayed payment is rounded to cents.
• Total interest = (displayed monthly payment × n) − P.

For the calculator’s default values, r = 8 ÷ 1,200 = 0.0066667 per month and n = 5 × 12 = 60 payments. The payment formula gives approximately $405.53 per month after rounding. Total of those rounded payments is $405.53 × 60 = $24,331.80; subtracting the $20,000 principal gives estimated total interest of $4,331.80.

Worked Example

With the default principal of $20,000, APR of 8%, and term of five years:

1. Convert the annual APR to a monthly rate: 0.08 ÷ 12 = 0.0066667.
2. Convert the term to months: 5 × 12 = 60.
3. Substitute the figures: $20,000 × 0.0066667 ÷ [1 − (1.0066667)⁻⁶⁰].
4. Round the calculated payment to cents: $405.53 per month.
5. Calculate interest using the displayed payment: ($405.53 × 60) − $20,000 = $4,331.80.

Assumptions

• The APR and payment amount remain fixed for the entire term.
• Payments are made monthly, with the first payment one month after the loan begins.
• Interest compounds monthly at APR divided by 12.
• The calculation excludes origination or other fees, taxes, insurance, and any charges not entered. It does not model late payments, skipped payments, or a changing rate.

How to Compare Personal Loan Offers

A useful comparison starts with matching inputs. Enter each offer’s actual amount, APR, and repayment term rather than assuming the same figures apply to every lender. If an offer includes a fee or a different amount deposited to you than the amount you must repay, this calculator cannot account for that difference directly. Check the lender’s disclosures for the amount financed, any fees, payment schedule, and total repayment figure.

Look at both monthly payment and total interest. A longer term generally spreads repayment over more months, which can lower the payment while increasing the total interest under otherwise identical assumptions. A shorter term can produce a higher payment but fewer months of interest. These are mathematical effects, not a judgment about which schedule fits someone’s circumstances.

• Compare offers for the same borrowing amount and a clearly stated APR.
• Check that the term is expressed consistently; this calculator accepts years and converts them to months.
• Separate interest from fees. A quoted APR and the lender’s fee disclosures are both relevant to the full cost.
• Compare the calculator’s estimate with the lender’s written payment schedule, which may reflect details not represented here.

What the Results Do and Do Not Show

The monthly payment is an estimate of the regular amount required by the formula. Total interest is the sum of those rounded payments minus the starting principal. Because each payment is rounded to cents for the total, the result can differ slightly from a calculation that retains extra decimal places throughout. A lender’s final payment may also be adjusted to account for rounding or payment dates.

This is not a personalized eligibility check. The calculator does not assess income, credit history, existing obligations, lender criteria, or whether a borrower qualifies. It also does not determine the amount a person can afford. Treat the APR, fees, and loan terms as inputs to verify directly with the lender, not as predicted or current market figures.

Common Comparison Mistakes

• Comparing only monthly payments: Different terms can make payments look similar while the total interest differs.
• Entering a percentage incorrectly: Enter 8 for 8% APR, not 0.08. The formula converts the percentage to a monthly decimal rate.
• Ignoring fees or net proceeds: A fee may change the amount received or repaid. Review the disclosure because this calculator does not add fees.
• Treating estimates as exact offers: The calculator applies a simplified fixed-rate schedule. The contract and lender disclosure govern the actual figures.
• Assuming every personal loan is fixed-rate: Confirm the rate structure and payment terms in the documents before using this fixed-rate estimate.

Frequently Asked Questions

How do I compare personal loan payments online?
Use the same principal, APR, and term for each calculation, then compare the estimated monthly payment and total interest. Separately review each lender’s disclosures for fees and other contract details.

Does a lower monthly payment mean a loan costs less?
Not necessarily. A longer repayment term can reduce each monthly payment while increasing the total interest because the balance remains outstanding for more months.

Is APR the same as the interest rate?
APR is an annualized borrowing-cost figure, but what it includes can depend on the offer and applicable disclosures. Check the lender’s documents to see how its APR and fees are presented; this calculator uses the APR you enter as the rate input.

Are personal loan calculator results exact?
No. They are estimates based on fixed monthly payments, a fixed APR, and the stated assumptions. Fees, payment-date details, rounding, or contract terms can change the lender’s figures.

Can this calculator tell me whether I will be approved?
No. It calculates estimated payments and interest only. It does not evaluate an application or predict a lender’s decision.

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

Related

• Auto Loan Comparison Calculator: Compare Payments
• Zip Installment Loan? How Zip Payments Work
• 30-Year Fixed Loan Rate Comparison Calculator

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 | $ | round(p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)), 2) | 2
out int | Total interest | $ | pmt * yrs * 12 - p | 2