How to calculate daily interest on mortgage?

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Calculating daily interest on a mortgage is an essential step in understanding the cost of borrowing and managing your finances effectively. By determining the daily interest amount, you can make informed decisions about your mortgage payments, interest rates, and overall loan repayment strategy. In this article, we will explore the process of calculating daily interest on a mortgage and provide you with the necessary information to navigate this aspect of homeownership.

Understanding Mortgage Interest

Before delving into the calculation of daily interest, it is crucial to grasp the concept of mortgage interest. When you borrow money to purchase a home, the lender charges you interest on the loan amount. This interest is typically calculated annually as a percentage of the outstanding loan balance.

Mortgage interest is commonly compounded monthly, which means that interest is added to the principal balance each month. The interest charged is based on the outstanding loan balance at the end of the previous month. Understanding this compounding process is fundamental to accurately calculating daily interest.

Calculating Daily Interest

To calculate daily interest on a mortgage, you need to follow these steps:

Step 1: Determine the annual interest rate: This information is usually provided by your lender and is expressed as a percentage.

Step 2: Convert the annual interest rate to a daily rate: Divide the annual interest rate by 365 (the number of days in a year). For example, if the annual interest rate is 4%, the daily rate would be 0.04 divided by 365, which equals approximately 0.0001096.

Step 3: Calculate the daily interest amount: Multiply the outstanding loan balance by the daily interest rate. For instance, if your remaining loan balance is $200,000, the daily interest amount would be $200,000 multiplied by 0.0001096, resulting in approximately $21.92.

By following these steps, you can determine the daily interest on your mortgage, which can be useful for various purposes, such as estimating the interest portion of your monthly payments or evaluating the impact of making additional principal payments.

Using a Mortgage Calculator

While the manual calculation method outlined above provides a precise daily interest amount, it may be time-consuming or complex for some individuals. In such cases, utilizing a mortgage calculator can simplify the process.

Mortgage calculators are readily available online and can help you determine not only the daily interest but also other important mortgage-related figures. These calculators typically require you to input your loan amount, interest rate, and loan term. Once you provide this information, the calculator will generate the daily interest amount and other relevant details, such as monthly payments and total interest paid over the loan term.


Calculating daily interest on a mortgage is an essential aspect of managing your finances and understanding the cost of borrowing. By following the steps outlined in this article, you can accurately determine the daily interest amount and make informed decisions regarding your mortgage payments. Whether you choose to calculate it manually or utilize a mortgage calculator, having a clear understanding of your daily interest can help you plan and strategize your loan repayment effectively.


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