What Is Exact Interest? Definition, Calculate, 4 Facts

Exact interest rates are rates charged on mortgages that allow borrowers to make monthly payments that exactly cover the principal and interest they owe, every month.

When calculating an exact interest rate, you need to consider several different factors. Continue reading to learn all you need to know.

What Is Exact Interest?

The precise technique, which assumes that each year contains exactly 365 days, may be used to compute loan interest. In contrast, other methods of calculating interest, such as every 360 days, use different time intervals.

What Is Exact Interest?

Applicants can better judge the true value of an interest rate if they understand if the lender uses a “rounded up” or “rounded down” interest model on the outstanding balance.

Exact Interest & Ordinary Interest

The structure of exact interest differs somewhat from that of simple interest. The computation of regular interest is based on the assumption that each calendar month has thirty days. As a result, the interest rate is computed for the entire year.

On the other hand, with exact interest, the computation is related to the actual number of days in the calendar year rather than an average of the number of days in each month. Rather of utilizing an average, this technique based interest estimates on specifics, which advocates claim makes it more accurate.

The ratio between precise interest and ordinary interest may be insignificant in the case of smaller loans granted by a financial institution. This implies that a consumer purchasing a used car with a two-year loan would not notice much of a difference either way.

The interest rate paid on a large loan with terms of twenty to thirty years might vary significantly depending on whether ordinary or exact interest is applied, therefore this is an essential factor for a firm taking out a loan to build a new corporate headquarters.

What Is Exact Interest?

Investments such as government-backed bonds and treasury bills frequently utilize the most exact compound interest computation feasible. Ordinary interest is used more commonly in personal loans, mortgages, and corporate bonds than in any other sort of loan or bond.

Despite this, there is substantial leeway in determining how to apply interest to the principle of the investment due to differences in the legislation that governs lending and investing practices among countries.

This is why it is necessary to review the transaction’s governing agreement to see which method is mentioned, and then compute the resulting interest. If that’s the case, it could be a good idea to keep exploring for a similar deal with interest computed using a different method.

Understanding Exact Days Method

Using the Daily method, the interest you earn is compounded every day. The IRS manages any debt you may owe them in this manner. Every day, interest is applied to the outstanding balance and then calculated again the next day. This is a more technical description.

The interest earned each day during a Daily compound period is calculated by multiplying the principle by the Daily Rate. This interest is added to the account every day, and the principal is doubled. Daily Rate = Nominal Annual Rate / Year Length (e.g., 360, 364, or 365).

What Is Exact Interest?

The Exact Days method may compute both compound interest and simple interest (no compounding). Exact Days interest is calculated by multiplying the principal by the yearly interest rate times the number of days before the next event, then dividing by the number of years.

Your interest expense will tie out to the number of days in the month/period. When you have compound interest, any unpaid interest will be capitalized when you have an event and added to the balance. Here is a more technical description.

The Daily Rate is multiplied by the total number of days in the payment period to calculate each interest payment.

If payments are paid on a monthly basis, the number of days in a month is used to calculate the amount. The interest rate for March (with 31 days) will be greater than the interest rate for April (30 days).

That prompts the question, “How?” Simple interest with Exact Days is a frequent way I’ve seen for computing interest on private loans.

This can make checking the interest calculation quite simple; all you’d need is the date period for which you’re seeking for an interest calculation. Any loan to a consumer or company that accumulates everyday is exceedingly exceptional.

How to Calculate Ordinary Interest and Exact Interest

The expense of borrowing money is referred to as interest. Companies and individuals that are short on cash or seek credit may borrow the monies they require and agree to pay interest on that money.

What Is Exact Interest?

Interest rates are set depending on what has already been agreed upon. A loan’s interest rate is represented as a percentage of the principal. The borrower would repay the lender the principle plus interest at the end of the loan’s interest term.

Interest = Principal * The interest rate formula is the primary formula for computing simple interest. However, time is an element that must be overlooked when calculating interest. As a result, we must modify the equation’s basis to: Interest = Principal x Rate x Time.

The temporal units to be utilized are years or fractions of a year. Because one year equals 12 months, converting a monthly time period to a fraction of a year is straightforward.

When time is described in terms of days, however, there are two possible equivalences to consider:

  • 360 days = 1 year
  • 30 days = 1 month
  • 365 days = 1 year

Businesses and financial institutions frequently employ ordinary interest. For issues requiring exact interest, only precise interest is required; for situations where interest is not expressly indicated, ordinary interest is assumed. The equations listed below will be used:

What Is Exact Interest?

I = Prt where P = principal (original sum), r = rate of interest and t = time expressed in years

  • I. = Pr (D/360); I. = ordinary interest, D = no. of days
  • I. = Pr (D/365); I. = exact interest

F = P + I where F = final amount to be paid

Sample problems:

What is the ordinary interest on $1,360 for 90 days at 4%? Given: P = $1,360, r = 4%, D = 90 days

  • Solution: I. = Pr (D/360); I. = $1,360 x 90/360 x 4/100; I. = $13.60

Find the exact interest on $500 at 8% for 45 days. Given: P = $500, r = 8%, D = 45 days

  • Solution: I. = Pr (D/365); I. = $500 x 8/100 x 45/365; I. = $4.93

Borrowing money from banks and other lending institutions is prevalent these days, so potential borrowers should be aware of the distinctions between conventional interest and exact interest calculations.

What Is Exact Interest?


When a financial institution pays interest, the interest is considered to be “precise interest” if it is calculated using a calendar year of exactly 365 days.

In contrast, the method used to calculate regular interest requires a full year’s worth of data. When dealing with large quantities of money, the differential between exact interest and ordinary interest might become significant.

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