30 Year Loan Mortgage Calculator



Calculating mortgage payments is a crucial aspect of financial planning, especially for those seeking a 30-year loan. To simplify this process, we present a user-friendly mortgage calculator built using HTML and JavaScript.

How to Use

  1. Enter the loan amount in the designated field.
  2. Input the annual interest rate.
  3. Specify the loan term (in years).
  4. Click the “Calculate” button for instant results.


The formula for calculating the monthly mortgage payment is:


  • is the monthly mortgage payment,
  • is the loan amount,
  • is the monthly interest rate (annual rate divided by 12 and multiplied by 0.01),
  • is the total number of payments (loan term in years multiplied by 12).


Let’s consider a $300,000 loan with an annual interest rate of 4.5% over 30 years.


Q1: How accurate is this calculator?
A1: The calculator uses the precise mortgage payment formula to ensure accuracy in the results.

Q2: Can I use this calculator for other loan terms?
A2: Yes, simply input the desired loan term in years to calculate monthly payments accordingly.

Q3: Is the interest rate input in decimal form?
A3: No, input the annual interest rate as a percentage, and the calculator will convert it to the required decimal form.


Our 30-Year Loan Mortgage Calculator provides a convenient way to estimate monthly mortgage payments accurately. This tool is designed for users seeking financial clarity and planning for a secure future.

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