Mortgage Payment Calculator

A mortgage payment calculator helps you estimate the monthly cost of a home loan using three core inputs: the loan amount (principal), the interest rate, and the loan term. Even small changes to any of these variables can make a noticeable difference, so a quick calculator is useful for comparing scenarios before you commit to a budget.

This calculator focuses on principal and interest, which is the standard amortized loan payment. It does not include taxes, insurance, or HOA fees unless explicitly listed. That means the result is a clean baseline for the loan itself, not the full monthly housing cost. If you want a complete estimate, you should add your expected property taxes, homeowners insurance, and HOA separately.

You can use the tool to answer questions like: How much does a 0.5% interest change affect my payment? How does a 30-year term compare to a 15-year term? What happens if I borrow a bit less or make a larger down payment? The calculator gives you the monthly payment and can be paired with an amortization view to understand how much of each payment goes toward interest versus principal over time.

The result is an estimate based on the inputs you provide. Real mortgage offers can include points, discounts, or lender-specific fees that affect your effective cost. Use this estimate as a starting point for planning and comparisons, then verify exact numbers with your lender.

If you are buying a home, consider running a few scenarios: your target home price, a conservative rate, and a higher rate to stress-test your budget. That way, you can see how resilient your plan is if rates shift or if your down payment ends up smaller than expected.

How it works

This calculator uses the standard fixed-rate mortgage formula for principal-and-interest payments. The formula is:

Payment = P × r × (1 + r)^n / ((1 + r)^n − 1)

Where: - P is the loan principal - r is the monthly interest rate (annual rate / 12) - n is the total number of monthly payments (years × 12)

The result is an estimate of the monthly payment for principal and interest only. It does not include property taxes, homeowners insurance, HOA dues, or private mortgage insurance (PITI). Those are important for a full monthly cost, but are outside this simplified calculation.

Examples

Example 1: 30-year mortgage - Loan amount: $320,000 - Interest rate: 6.25% - Term: 30 years

Steps: 1. Monthly rate = 6.25% / 12 = 0.5208% 2. Number of payments = 30 × 12 = 360 3. Plug into the formula to get a monthly payment of about $1,969

Example 2: Shorter term - Same loan: $320,000 - Same rate: 6.25% - Term: 15 years

Result: Monthly payment rises to about $2,744, but total interest paid over the life of the loan is much lower.

FAQ

Common questions

Does this include taxes and insurance?

No. This calculator estimates principal and interest only. Add taxes, insurance, and HOA separately.

Why is my lender's payment different?

Lenders may include escrow items, points, or fees that change the effective payment.

Is the result exact?

It is an estimate based on the inputs you provide.

Disclaimer

Disclaimer

This calculator provides educational estimates only and should not be considered financial advice.

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How to Calculate a Mortgage Payment (Step-by-Step)

A step-by-step guide to mortgage payments: the formula, the inputs that matter, and a worked USD example you can copy to sanity-check your …

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