Free Mortgage Calculator Usa
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Reviewed by Calculator Editorial Team
This free mortgage calculator helps you estimate your monthly mortgage payments in the USA. Simply enter your loan amount, interest rate, and loan term to get an instant calculation.
How to Use This Calculator
Using our mortgage calculator is simple:
- Enter the loan amount you're applying for in the "Loan Amount" field.
- Input your annual interest rate in the "Interest Rate" field.
- Select the loan term in years from the dropdown menu.
- Click the "Calculate" button to see your estimated monthly payment.
The calculator will display your monthly payment, total interest paid over the life of the loan, and the total amount paid (principal + interest).
Mortgage Formula
The monthly mortgage payment is calculated using the following formula:
M = P [ i(1 + i)n ] / [ (1 + i)n - 1 ]
Where:
- M = Monthly payment
- P = Principal loan amount
- i = Monthly interest rate (annual rate divided by 12)
- n = Number of payments (loan term in years multiplied by 12)
This formula uses the standard amortization method where equal payments are made each month, including both principal and interest.
Worked Example
Let's calculate a mortgage payment for a $200,000 loan at 4.5% annual interest for 30 years.
- Convert annual interest rate to monthly: 4.5% ÷ 12 = 0.375% or 0.00375 in decimal
- Calculate number of payments: 30 years × 12 = 360 payments
- Plug values into the formula:
M = $200,000 [ 0.00375(1 + 0.00375)360 ] / [ (1 + 0.00375)360 - 1 ]
- The calculation results in a monthly payment of approximately $1,073.64
Over 30 years, you would pay a total of $386,470 (including principal and interest).
Frequently Asked Questions
- What is a mortgage calculator?
- A mortgage calculator estimates your monthly mortgage payments based on loan amount, interest rate, and loan term. It helps you plan your budget and understand the cost of homeownership.
- Is this calculator accurate?
- This calculator provides an estimate. Actual mortgage payments may vary based on your lender's specific terms and additional fees. Always consult with a mortgage professional for precise calculations.
- What factors affect mortgage payments?
- Key factors include loan amount, interest rate, loan term, down payment, and additional fees. The calculator focuses on the core components of principal and interest payments.
- Can I use this for refinancing?
- Yes, you can use this calculator to estimate payments for refinancing scenarios by adjusting the loan amount, interest rate, and term to reflect your new mortgage terms.
- What's the difference between fixed and adjustable-rate mortgages?
- Fixed-rate mortgages have the same interest rate for the entire loan term, while adjustable-rate mortgages (ARMs) have an initial fixed rate that may change later. This calculator works best for fixed-rate mortgages.