calculate-loan

01 Loan payments

Personal Loan Payment Calculator: Free Monthly Estimate

Calculator No. 01-5179 · Updated · Formula and assumptions shown below

Monthly payment $405.53
Total interest
$4,331.67
= Monthly payment × loan term × 12 − loan amount
Loan amount
$20,000
Input
Interest rate (APR)
8 %
Input
You enter
Loan amount ($), Interest rate (APR) (%), Loan term (years)
You get
Monthly payment ($), Total interest ($)
Rounding
2 dp

Estimate for education, not financial advice. The result follows from the numbers you enter and the formula shown. It is not a quote or an offer, and it does not include fees, taxes or insurance unless the calculator asks for them. Ask your lender for the exact figures.

Yes. This free personal loan payment calculator estimates a fixed-rate loan’s monthly payment and total interest from the loan amount, annual percentage rate (APR), and term. Enter the figures shown in a lender’s offer or disclosure to see the arithmetic; the estimate does not include fees or other loan charges.

Formula

The calculator uses the standard level-payment formula for a fixed-rate loan with monthly payments. It calculates a payment from the principal, monthly interest rate, and number of payments:

Monthly payment = P × r ÷ [1 − (1 + r)−n]

  • P is the loan amount, or principal, in dollars.
  • r is the monthly interest rate as a decimal. The calculator converts APR entered as a percentage into a monthly rate: r = APR ÷ 1,200.
  • n is the number of monthly payments: loan term in years × 12.

Total interest is estimated as monthly payment × n − P. The displayed payment is rounded to cents, and the interest calculation uses that displayed payment. Actual loan schedules can differ if the lender calculates interest or rounds payments differently.

Worked Example

Using the calculator’s default values—$20,000 principal, 8% APR, and a five-year term—the number of monthly payments is 5 × 12 = 60. The monthly rate is 8 ÷ 1,200 = 0.0066667.

Substitute those values into the payment formula:

$20,000 × 0.0066667 ÷ [1 − (1.0066667)−60] = $405.53 per month, rounded to the nearest cent.

Using the rounded payment, estimated total payments are $405.53 × 60 = $24,331.80. Estimated total interest is $24,331.80 − $20,000 = $4,331.80. The figures are estimates under the assumptions below, not a lender’s final repayment schedule.

Assumptions

  • The interest rate remains fixed throughout the loan term.
  • Payments are level monthly payments, made at the end of each monthly period.
  • Interest compounds monthly at APR ÷ 12; the APR is treated as a nominal annual rate for this calculation.
  • Fees, taxes, insurance, optional products, and other charges are not included.

How to Use the Estimate

Enter the amount you expect to borrow, the APR supplied for the loan, and the repayment term in years. If a disclosure gives the term in months, divide that number by 12 to enter years. For example, 36 months is three years. The calculator returns a monthly payment and the estimated interest paid over the full term.

Use the result to understand how the term affects the payment and interest under the same APR and principal. A longer term generally spreads repayment over more months; that lowers the amount of principal paid in each monthly installment, but interest accrues for longer. A shorter term has fewer payments, so the monthly amount may be higher even though the total number of interest-bearing months is lower. This is a mathematical relationship, not a recommendation about which term to choose.

Compare the estimate with the lender’s stated payment and full repayment schedule. Check whether the borrowed amount is the amount deposited to you or includes financed charges, and whether the quoted APR and term match the numbers entered. The APR is useful as a disclosed borrowing-cost figure, but this calculator does not separately model the timing or treatment of particular fees.

Common Mistakes and Limits

  • Entering a monthly rate as APR: The rate field expects a yearly percentage, such as 8 for 8%, not 0.6667 for a monthly percentage.
  • Mixing months and years: The term field is in years. Convert a term stated in months before entering it.
  • Using the wrong principal: Enter the loan amount used to calculate payments, not an intended net amount if the lender adds charges to the balance.
  • Treating the result as a quote: The calculator does not know the actual lender’s fees, payment dates, rounding method, or contract terms.

The formula assumes a fixed rate and equal payments. It does not model variable rates, irregular payment dates, late payments, skipped payments, additional principal payments, or a changing balance from fees. The result also cannot determine whether a lender will offer a particular APR, amount, or term. Obtain the actual figures from the lender and use the disclosure for the loan’s contractual payment details.

Free Calculator vs. Lender Disclosure

A free calculator provides a quick, repeatable estimate without requiring a lender’s account or a credit application. It can show how a change in amount, APR, or term affects the formula’s result. A lender disclosure, in contrast, sets out the actual proposed loan figures and terms; it may include charges or other details this simple calculation omits. Do not treat a calculator result as an approval, an offer, or a complete cost comparison.

For a more complete comparison of offers, use the figures and definitions provided in each lender’s documents, including the amount financed, payment schedule, total payments, and any disclosed charges. Make sure you are comparing the same borrowing amount and repayment period. Different fee treatment can make two calculations with the same stated APR differ from the simple estimate.

Frequently Asked Questions

Is a personal loan payment calculator free?
Yes. This calculator estimates payments from the inputs you provide and does not require payment to perform the calculation.

How do I calculate a personal loan payment?
Convert APR to a monthly decimal rate by dividing the percentage by 1,200, convert the term to monthly payments, and apply the level-payment formula shown above. The calculator performs those steps and rounds the payment to cents.

Does the monthly payment include interest?
Yes. Each calculated level payment includes principal repayment and interest under the formula. The calculator also estimates total interest over the full term, but excludes fees and other charges.

Why is my lender’s payment different?
The lender may use different loan details, payment dates, rounding, fee treatment, or calculation conventions. Check that the amount, APR, and term match, then rely on the lender’s disclosure for the contractual figures.

Can I use this calculator for a variable-rate loan?
Not accurately over the full term. The formula assumes the rate stays fixed. If a variable rate changes, future payments or the payoff schedule may change too.

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

Related

Formula used
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

Each line is one input (in, sel, list) or one result (out: label, unit, formula, decimals). How the calculators work

Method: the standard loan formula for this calculation, fixed rate and monthly compounding unless stated, rounded as each result states. Not financial advice; no lender, rate or product is recommended. See formulas and assumptions, the disclaimer or report an error.

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