How to Calculate the Monthly Payment on a $1,000 Personal Loan?

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Matthew DuFinancial Writer

Posted on Sep 26, 2025

You can easily calculate it yourself with these parameters:

  • Principal: the amount borrowed.
  • Annual percentage rate (assuming that additional charges have been added).
  • Loan term: the period in which the loan will be repaid.

Then you use this formula:

M= P*R*(1+R)N
(1+R)N-1

Where
M is the monthly payment,
P is the principal,
R is APR/12 (since there are 12 months in a year), and
N is the loan term in months.

Possible Monthly Payments on a $1,000 Personal Loan

The following table displays some potential payments on a $1,000 personal loan with a 15% APR and various loan periods.

Loan term (months) APR (%) Total interest ($) Monthly payment ($)
12 15 83 90
24 15 164 48
36 15 248 35
48 15 336 28
60 15 427 24
72 15 522 21
84 15 621 19

 

It's important to note that the payments you make monthly can be very different from this because the annual percentage rate on a personal loan has a wide range of 3%-36%.

While a longer repayment term has its benefits, such as a more affordable monthly payment, it also comes with its disadvantages, including:

  • Increase in the total interest
    You will pay the interest for longer, causing a rise in the entire interest.
  • Difficulty getting another loan
    Generally, the earlier you complete payments, the earlier you can get another loan.

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