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financial / Free Online Tool

Mortgage Calculator.

Estimate monthly mortgage payments, total interest costs, and view a complete amortization schedule.

Input Parameters

$
$
%
years

Comments & Feedback.

Documentation

User manual & function guide.

Detailed manual explaining every function, input parameter, and operational example for the Mortgage Calculator.

Home Value

Function

Total purchase price of the home.

Example Operation Home Value = $400,000

Down Payment

Function

Upfront cash paid toward purchase price.

Example Operation Down Payment = $80,000 (20%)

Interest Rate

Function

Annual percentage interest rate (APR).

Example Operation Interest Rate = 6.5%

Loan Term

Function

Total loan duration in years.

Example Operation Loan Term = 30 years

Monthly Payment Calculation

Function

Computes fixed monthly principal and interest payment.

Example Operation $400,000 Home Value - $80,000 Down Payment @ 6.5% for 30 yrs = $2,022.62 / mo

Amortization Schedule

Function

Generates annual principal paid, interest paid, and remaining balance.

Example Operation Year 1 Balance = $315,400

Frequently asked questions.

How is a monthly mortgage payment calculated?

Monthly mortgage payments are calculated using the standard amortization formula: M = P[r(1+r)^n] / [(1+r)^n – 1], where P is the principal loan amount, r is the monthly interest rate, and n is the total number of monthly payments.

What is a good down payment percentage for a home?

A common recommendation is 20% of the home value to avoid private mortgage insurance (PMI). However, many programs allow as low as 3-5% down payment.

How does interest rate affect total mortgage cost?

Even a small change in interest rate significantly impacts total cost. For example, on a $300,000 loan over 30 years, a 1% rate increase can add over $60,000 in total interest paid.

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