Introduction
The cost you pay to borrow money or the cost you charge to lend money is known as interest. The most common way to express interest is as a percentage of the loan amount over a year. The loan's interest rate is expressed as a percentage. Interest is money paid on top of the principal amount borrowed on a loan or money received on top of savings or investment account contributions. The opportunity cost experienced by the lender due to his or her incapacity to use the money lent out is the source of interest. The interest on a loan or deposit is normally computed as a percentage of the amount borrowed. Interest is paid regularly, such as monthly, semiannually, yearly, or at any other time specified in a loan or savings/investment contract. Interest is most commonly expressed as an annual rate, but it can also be calculated for shorter or longer periods. The interest rate is the interest rate expressed as a percentage. Interestbearing financial goods include loans, mortgages, credit card debt, bonds, commercial paper, fixed deposits, and bankers' acceptances.
When you deposit money in a savings account, for example, a bank will give you interest. The bank compensates you for keeping your money and investing it in other transactions. If you borrow money to cover a major expense, however, the lender will charge you interest on top of the loan amount. Interest is calculated in a variety of ways, some of which are more profitable for lenders than others. The amount of interest you pay is defined by the expected return, whereas the amount of interest you earn is determined by the numerous investment options available to you.
 When Getting a Loan  You are responsible for repaying any money you borrow. To compensate the lender for the danger of lending money, you must repay more than you borrowed in interest.
 When Lending  If you have excess money, you can either lend it out or deposit it in a savings account, allowing the bank to lend it out or invest it. You can expect to receive interest on the money you lend or deposit in return.
Characteristics
 The interest rate is the amount that a lender charges a borrower in addition to the principal for the use of assets.
 An interest rate also pertains to money earned from a bank or credit union deposit account.
 The majority of mortgages employ simple interest. In some loans, compound interest is charged on both the principal and the accrued interest from previous periods.
 A lender will charge a borrower who is considered low risk a lower interest rate.
 The interest rate on a loan with a highrisk rating will be greater.
Difference between Interest Rate and Annual Percentage Rate in Tabular Form
An annual percentage rate (APR) differs from an interest rate in that it provides a more precise estimate of how much you'll pay while borrowing money. Your APR will be larger than your interest rate because it includes your interest rate as well as any loanrelated expenses. The annual percentage rate, commonly known as the effective interest rate, is abbreviated as APR.
Parameters of Comparison

Interest Rate

Annual Percentage Rate

Definition

The amount of interest you will pay on a mortgage loan is calculated using your yearly interest rate, which is a simple formula.

The APR accounts for a variety of costs and fees that are not included in the interest rate.

Calculation

Interest rates provide a fundamental calculation.

APR can be used to compare mortgage lenders.

Main Interest

The main interest rate is a measure to keep an eye on.

Under the APR, lenders are forbidden from withholding information about certain fees.

Flexibility

Interest rates are a crucial measure to keep an eye on.

Under the APR, lenders are forbidden from withholding information about certain fees.

Total cost of the loan

Doesn't provide you with an accurate picture of a loan's total cost.

A lower APR may not necessarily imply a reduced transaction cost.

What is Interest Rate?
The interest rate is the cost of a loan or credit purchase represented as a percentage of the total loan or credit amount each year. On a loan or credit purchase, the interest rate is both the borrower's and the lender's or creditor's rate of return. Most loans, mortgages, credit card balances, and purchases made on credit use simple interest, in which the interest rate is applied directly to the outstanding balance, without compounding or adding it in. The interest rate on a loan is applied to the principal, which is the amount borrowed. The interest rate is the borrower's cost of debt as well as the lender's rate of return. Because lenders seek compensation for the loss of use of the money during the loan time, the amount to be repaid is frequently greater than the amount borrowed. Instead of granting a loan, the lender may have invested the funds over that period, generating income from the asset. The interest charged is the difference between the final repayment amount and the original loan amount.
The interest rate on a loan is applied to the principal, which is the amount borrowed. The interest rate is the borrower's cost of debt as well as the lender's rate of return. Because lenders seek compensation for the loss of use of the money during the loan time, the amount to be repaid is frequently greater than the amount borrowed. Instead of granting a loan, the lender may have invested the funds over that period, generating income from the asset. The interest charged is the difference between the final repayment amount and the original loan amount.
Your annual interest rate is a simple estimate of the interest you'll pay on a mortgage loan, minus any other fees. The annual percentage rate (APR) is often a few tenths of a percentage point less than the interest rate. The vast majority of customers search for lenders and compare loan offers based on their interest rates. Even though interest rates are sometimes reported as monthly rates, they are usually expressed as annual rates. Your monthly mortgage payment will be the cheapest if you acquire the lowest interest rate. Compare the APR rates provided to you if you want to find out how much a mortgage loan will cost you in total. The best annual percentage rate isn't usually the cheapest rate or payment, but it is the most affordable overall.
The federal funds rate, or Fed, is set by the Federal Reserve, which has an impact on investment rates. The universal reserves rate is the overnight rate at which banks pay savings dividends to other banks. In a recession, the Federal Reserve may, for example, lower the federal funds rate to encourage consumers to spend. The Federal Reserve would generally gradually boost interest rates during periods of strong economic growth to promote more savings and balance cash flow.
What is Annual Percentage Rate?
The annual percentage rate (APR) is a useful indicator of a loan's cost. For example, if you're considering taking out a personal loan and want to know how much it will cost you, you should look at the Annual Percentage Rate, which is the amount you'll pay in addition to the principal. As a result, it's a good idea to avoid relying solely on the annual interest rate, which only tells you about the interest component. The APR is a far better approach to calculating the cost of a loan because it incorporates all additional fees. Borrowers are sometimes enticed by lower yearly interest rates, but the added fees can be substantial. The APR calculates the exact percentage of all loan charges, allowing you to better understand how much the loan will cost you. The APR is sometimes mistaken for the nominal interest rate. While the nominal interest rate is included in the APR, it also includes extra expenses associated with the loan. As a result, it's a combination of a loan's annual interest rate and other fees. As a result, the APR on a loan is always larger than the nominal interest rate.
The APR refers to the loan's overall interest rate as well as any additional fees incurred throughout the loan's purchase. The APR normally includes both the lenders and appraisal fees; however, when the appraisal charge is not included, the lender's expenses are sometimes included. Simply explained, it is the total cost of borrowing over a year. Because it is more comprehensive, it is a better instrument for comparing financial goods than the interest rate. It is a trustworthy predictor of the loan's overall cost. When it comes to borrowing, it is seen as an essential guiding factor.
When comparing loans, the APR, on the other hand, is the more useful rate to examine. The APR comprises not just the loan's interest expense, but also any fees and other charges associated with the loan's acquisition. Broker fees, closing costs, rebates, and discount points are examples of these fees. Often, these are given as a percentage. Except in the event of a specific contract where a lender offers a rebate on a portion of your interest payment, the APR should always be larger than or equal to the nominal interest rate.
Consider the fact that, in addition to the $5,000 in closing expenses, mortgage insurance, and loan origination fees mentioned above, your house purchase will also require $5,000 in closing costs, mortgage insurance, and loan origination fees. These fees are applied to the original loan amount to create a new loan amount of $205,000, which is used to calculate your mortgage loan's APR. The new annual payment of $12,300 is then calculated using the 6% interest rate. To find the APR, divide the $12,300 annual payment by the $200,000 original loan amount to get 6.15 percent.
At least three methods exist for calculating the effective annual percentage rate:
 By compounding the interest rate for each year, ignoring fees;
 By adding origination fees to the sum due, and using the entire amount as the foundation for computing compound interest;
 By amortizing the origination fees as a shortterm loan. The outstanding balance of this loan is amortized as a second longterm loan in the first payment(s). The additional first payment(s) will be used to cover the origination costs and interest charges on that portion of the loan.
Difference Between Interest Rate and Annual Percentage Rate In Points
The major distinction between an interest rate and an annual percentage rate (APR) is that with an interest rate, the cost of taking something is the principal amount. The APR is the most useful rate to look at because it covers not just the interest on the loan, but also the fees and other expenditures associated with acquiring the loan. A purchaser's credit score and commanding rates–i.e., the total interest rate now required by moneylenders on mortgage loans–are also used to compute the interest rate currently charged on mortgage loans. Your credit score is often used to establish your interest rate, thus the higher your credit score, the more dependable it is. The lender determines the APR, which includes loan fees and any additional charges that vary by institution. It provides borrowers with a more detailed picture of a loan's cost. The recurrent payment, which is purely determined by the interest rate, has nothing to do with the Annual Percentage Rate.
 Interest rates are a good predictor of your monthly payment however the annual percentage rate (APR) does not account for many of the expenditures and fees.
 While interest rates give a standard calculation, the annual percentage rate (APR) allows for a meaningful comparison of various mortgage providers and packages.
 Interest rates are an important metric to pay attention to. APR, on the other hand, prevents lenders from withholding some costs.
 The interest rate does not accurately reflect the whole cost of a loan, and a lower APR does not always indicate a better deal.
 The rate of interest APR can be fixed or locked, but APR can only be optimized if the borrower intends to stay in the property for the duration of the loan.
Conclusion
Other "hidden" expenditures, such as closing costs or mortgage "points," must be covered by the borrower. These fees differ per lender and even among the many loan options offered by the same lender.
Interest rates and annual percentage rates are not the same things, and the two should not be confused. An interest rate is a valuable tool for determining the cost of borrowing the principal on a home loan and estimating the cost of a monthly mortgage payment. On the other hand, an annual percentage rate (APR) allows borrowers to estimate the overall cost of a mortgage.
References
 "Finance & Development, June 2003  Contents". Finance and Development – F&D.
 ^ "Finance & Development, March 2010 – Back to Basics". Finance and Development – F&D.
 Money Factor Definition, funda Engineering Fundamentals
 ^ Monthly Lease Payments, leaseguide.com