Personal Loan Payment Calculator and Feature Comparison

This personal loan payment calculator estimates your monthly payment and total interest from the amount borrowed, APR, and repayment term. Enter the figures shown in a lender’s offer to compare the payment mechanics; results assume fixed monthly payments and do not include fees or optional costs.

Formula

The calculator uses the standard fixed-payment loan formula. First, it calculates the monthly rate, then finds the payment that repays principal and interest over the term:

• Monthly rate: r = APR / 1,200, where APR is entered as a percentage per year.
• Number of payments: n = years × 12.
• Monthly payment: M = P × r / [1 − (1 + r)⁻ⁿ].
• Total interest: I = (M × n) − P.

P is the loan principal in dollars, r is the monthly interest rate as a decimal, n is the number of monthly payments, and M is the monthly payment in dollars. The displayed payment is rounded to cents. In this calculator, total interest is calculated from that rounded payment, so it reflects the displayed amount multiplied by the stated number of payments, minus principal. A real final payment can differ slightly because lenders may adjust for rounding or payment dates.

Worked Example

Using the defaults—$20,000 borrowed at 8% APR for 5 years:

1. Convert the APR to a monthly rate: 8 / 1,200 = 0.0066667.
2. Convert the term to payments: 5 × 12 = 60 months.
3. Substitute into the payment formula: 20,000 × 0.0066667 / [1 − (1.0066667)⁻⁶⁰] = $405.53 per month, rounded to cents.
4. Calculate total interest using the displayed payment: ($405.53 × 60) − $20,000 = $4,331.80.

The results are estimates based on the formula and the entered assumptions.

Assumptions

• The interest rate is fixed for the full term.
• Payments are equal, made monthly, and begin according to a regular payment schedule.
• Interest accrues monthly at APR divided by 12.
• Fees, taxes, insurance, late charges, payment-date effects, and optional add-ons are not included.

What Personal Loan Features to Compare

A personal loan is typically an installment loan: a borrower receives a lump sum and repays it through scheduled payments. “Feature comparison” is not just comparing the quoted payment. Two offers can have similar payments but different APRs, terms, fees, flexibility, or total repayment. Use each lender’s actual written terms as inputs; do not assume that a rate or fee shown in an example applies to you.

• APR and interest rate: The interest rate measures the cost of borrowing before considering all charges. APR is designed to express the annualized cost with certain borrowing charges included, but what it includes can depend on the offer and applicable disclosure. Check the lender’s explanation and compare like with like.
• Term: A longer repayment period generally spreads principal over more payments, which can lower the scheduled payment while increasing the time interest accrues. The calculator shows this trade-off for fixed-rate, level-payment loans.
• Fees and net proceeds: An origination or other fee may be deducted from the amount disbursed, charged separately, or handled another way. Compare the amount you actually receive with the amount you must repay, not just the advertised principal.
• Payment flexibility: Check whether extra payments, early payoff, payment-date changes, or hardship options are described in the contract, and whether any charge or condition applies. This calculator does not model these features.
• Secured or unsecured structure: Personal loans may be unsecured or backed by collateral. Collateral changes the consequences of missed repayment; read the contract rather than inferring protections from the product label.

How to Compare Offers Fairly

Compare offers using the same borrowing amount and a common term where possible. If the terms differ, note both the monthly payment and the total scheduled payments, then account for any fee and the net cash received. A longer term can make a payment look smaller without making the borrowing less expensive overall.

For example, a $10,000 loan with a lower monthly payment because it runs longer is not directly comparable to a shorter loan by payment alone. Put each offer’s APR and term into the calculator, then compare the estimated payment and interest. Separately review all required fees, repayment conditions, and the lender’s stated total of payments. If a fee is financed into the principal, enter the amount actually financed; if it is deducted from disbursement, remember that the calculator cannot show the reduced cash received.

When reading an offer, distinguish the advertised loan amount from the amount deposited. Also check whether the quoted payment assumes automatic withdrawal, optional products, or other conditions. A calculator is useful for checking arithmetic, but it cannot confirm that a quoted APR includes every cost relevant to your comparison.

Limits and Common Mistakes

This estimate applies to a fixed-rate loan with regular monthly payments. It does not model variable rates, irregular payment dates, deferred payments, balloon payments, additional principal payments, or fees. If the actual contract uses a different structure, the displayed results will not reproduce its schedule exactly.

• Do not enter “8” as an interest rate of 0.08%; enter 8 for 8% APR.
• Use the APR and term from the same offer. Combining an interest rate from one offer with the term from another creates a hypothetical result.
• Do not treat the payment as a full measure of cost. Compare total payments, fees, net proceeds, and contract terms as well.
• Remember that rounding affects totals. The calculator uses a monthly payment rounded to cents; a lender’s final installment may be adjusted.

Approval, offered terms, and the amount available depend on information and processes outside this calculation. The calculator does not assess eligibility, predict a credit decision, or determine whether borrowing fits a person’s circumstances. Obtain the actual rate, fees, payment schedule, and disclosures directly from the lender before relying on an offer.

Frequently Asked Questions

What personal loan features should I compare?
Compare APR, repayment term, monthly payment, total scheduled repayment, fees, net amount received, collateral requirements, and contract rules for early or extra payments. Review the offer documents for details the calculator cannot represent.

Does a lower monthly payment mean a loan costs less?
Not necessarily. A longer term can reduce the monthly payment while increasing the total interest paid. Compare the total scheduled payments and fees alongside the payment amount.

Is APR the same as the interest rate?
No. The interest rate is the charge applied to the outstanding balance, while APR is an annualized cost measure that may account for certain fees. Check the lender’s disclosure to see what its APR includes.

Does this calculator include origination fees?
No. It calculates payments and interest from the principal, APR, and term entered. If a fee is added to the balance, enter the financed amount to estimate that balance’s payment; fees deducted from proceeds still require a separate comparison.

Can I use this for a variable-rate personal loan?
Only as a simplified snapshot using one assumed APR. A variable rate can change, so future payments or total interest may differ from this fixed-rate estimate.

This result is an estimate for educational purposes; the lender’s disclosure gives the exact figures.

Related

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• Typical Closing Costs: What Buyers and Sellers Pay
• Typical Buyer Closing Costs: What to Expect

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