30 Year Loan Interest Calculator



Calculating the interest on a 30-year loan is a crucial step in financial planning, especially when considering mortgage options. To simplify this process, we’ve developed a user-friendly 30-Year Loan Interest Calculator using HTML and JavaScript.

How to Use

  1. Input the loan amount, interest rate, and loan term in the respective fields.
  2. Click the “Calculate” button to obtain the accurate interest amount.
  3. The result will be displayed within the form, providing instant insights into your loan’s financial details.


The formula for calculating the interest on a 30-year loan is:


Suppose you have a loan amount of $200,000, an annual interest rate of 4%, and a 30-year loan term.

\text{Interest} = \left( \frac{200,000 \times 4 \times 30}{100} \right) = $240,000


Q1: Is the provided formula accurate for all loan scenarios?

A1: Yes, the formula is universally applicable for calculating 30-year loan interest accurately.

Q2: Can I use this calculator for any currency?

A2: Absolutely! Input your loan amount in the desired currency, and the calculator will provide accurate results.

Q3: What does the “Loan Term” field represent?

A3: The “Loan Term” refers to the number of years over which the loan is to be repaid.

Q4: How frequently should I update the interest rate?

A4: The interest rate should be the annual rate, so if it changes, update it annually for precise calculations.


In conclusion, our 30-Year Loan Interest Calculator offers a convenient way to estimate the interest on a loan, aiding in financial decision-making. With its user-friendly interface and accurate formula, it proves to be a valuable tool for anyone exploring mortgage options.

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