calculate-loan

01 Loan payments

Personal Loan Payment Calculator and Monthly Cost

Calculator No. 01-6606 · Updated · Formula and assumptions shown below

Monthly payment $405.53
Total interest
$4,331.80
= 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.

This personal loan payment calculator estimates your fixed monthly payment and total interest from the amount borrowed, annual percentage rate (APR), and repayment term. Enter the figures from a lender’s quote to see the estimated payment and interest over the full term.

Formula

The calculator uses the standard fixed-payment loan formula. It first converts the annual APR into a monthly rate, then calculates the payment that would repay the starting balance over the specified number of months:

Monthly payment = round(P × r / (1 − (1 + r)−n), 2)

  • P is the loan amount in dollars.
  • r is the monthly interest rate as a decimal: APR ÷ 1,200. For an 8% APR, r = 0.08 ÷ 12.
  • n is the number of monthly payments: loan term in years × 12.

Total interest is calculated as monthly payment × n − P. Because the payment is rounded to cents first, the total reflects that rounded payment. A lender’s final scheduled payment can differ slightly to clear any remaining cents.

Worked Example

Using the calculator’s defaults—$20,000 borrowed, 8% APR, and a five-year term:

  1. Monthly rate: 0.08 ÷ 12 = 0.0066667.
  2. Number of payments: 5 × 12 = 60.
  3. Substitute into the payment formula: $20,000 × 0.0066667 ÷ [1 − (1.0066667)−60].
  4. The monthly payment rounds to $405.53.
  5. Total interest using that rounded payment: $405.53 × 60 − $20,000 = $4,331.80.

Assumptions

  • The APR and payment amount stay fixed throughout the term.
  • Payments are made monthly, at the end of each period, with the first payment one month after borrowing.
  • Interest is modelled monthly at APR ÷ 12.
  • The estimate does not include origination or other fees, taxes, insurance, or optional services. Add-on costs may change the amount financed or total paid.

What a Low Personal Loan Payment Means

A “low payment” describes a monthly amount, not necessarily a low borrowing cost. The payment depends mainly on the amount financed, APR, and term. A longer term spreads repayment over more months and can lower each payment, but interest accrues for longer. A lower APR can also reduce the payment and interest, while borrowing less reduces both.

For example, the calculator’s $20,000 loan at 8% APR has a payment of $405.53 over five years. Extending the term would generally reduce the monthly amount, but the borrower would make more payments and could pay more total interest. The precise comparison requires calculating each offer using its own amount, APR, term, and fees.

Compare the payment with the full repayment schedule and total cost rather than treating the smallest monthly figure as the cheapest option. A quote may include a fee deducted from the proceeds or added to the balance; check which amount the lender uses as the principal.

How to Read and Use the Estimate

Use the calculator to explore scenarios or check the arithmetic of a quoted fixed-rate payment. Enter the amount that will actually be repaid, the quoted APR, and the term in years. If the term is stated in months, divide by 12 before entering it; for example, 36 months is 3 years.

  • Use the APR shown for the specific loan offer, not a promotional figure that may have conditions.
  • Check whether fees are paid separately, withheld from proceeds, or included in the balance.
  • Compare the same borrowing amount and loan term when examining multiple quotes.
  • Review the payment schedule and any final-payment adjustment in the lender’s disclosure.

This is an estimate of level monthly principal-and-interest payments. It does not establish eligibility, approval, or what amount a person can afford. The lender’s written disclosure is the source for the actual payment schedule and loan costs.

Why Payments Can Differ

A calculator’s result may not match a lender’s figure exactly if the lender uses a different financed amount, payment date, rounding method, or treatment of fees. A variable-rate loan can also have payments that change when its rate changes; this fixed-rate model cannot project those changes. A loan with irregular payments, a balloon payment, or a different compounding convention likewise needs a different calculation.

APR and interest rate are related but are not always interchangeable in a quote. APR can account for certain borrowing costs in its calculation, while the periodic interest rate determines how interest is applied to the balance. This calculator treats the APR as the annual rate used to derive the monthly rate and does not separately add fees. Use the lender’s stated figures and disclosures to understand how its payment was determined.

Rounding matters over many payments. This calculator rounds the regular payment to the nearest cent and multiplies it by the number of months for the interest estimate. A lender may carry extra precision internally or adjust the final payment, so small differences are possible.

Frequently Asked Questions

How can I get a lower personal loan payment?
A smaller principal, lower APR, or longer repayment term reduces the formula’s monthly payment, all else equal. A longer term can increase total interest, so compare both the payment and the total repayment amount.

Does a lower monthly payment mean I pay less overall?
No. A longer term can reduce each payment while increasing the number of payments and total interest. Compare the full term’s total cost as well as the monthly amount.

Is the calculator’s payment the exact amount a lender will charge?
No. It is an estimate based on the entered amount, APR, term, and stated assumptions. Fees, payment timing, rounding, and the lender’s contract can change the actual schedule.

Should I enter the amount I receive or the amount I repay?
For this formula, enter the principal balance being repaid. If a fee is withheld from proceeds but added to the loan balance, the financed amount may be greater than the cash received; check the quote’s breakdown.

Can I use this for a variable-rate personal loan?
Only as a snapshot under the assumption that the entered APR stays fixed. The calculator does not forecast future rate changes or resulting payment adjustments.

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 | $ | round(p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)), 2) | 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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