Mortgage Calculator

How to Use the Mortgage Calculator

Our free mortgage calculator helps you estimate the cost of financing a home before you commit to a loan. Simply enter the total home price (or the loan amount after your down payment), your expected annual interest rate, and the loan term in years. The calculator instantly shows your monthly payment, total amount paid over the life of the loan, and the total interest cost.

Understanding your mortgage payment is the first step toward responsible home buying. Most financial advisors recommend keeping your housing costs, including mortgage, taxes, and insurance, below 28% of your gross monthly income. Use this calculator to experiment with different price points and loan terms to find a payment that fits your budget comfortably.

The Mortgage Payment Formula

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 (annual rate divided by 12), and n is the total number of payments (years multiplied by 12). This formula ensures each payment covers both interest and a portion of the principal, gradually paying down your balance to zero by the end of the term.

Fixed-Rate vs. Adjustable-Rate Mortgages

This calculator models a fixed-rate mortgage, where the interest rate stays the same for the entire loan term. Fixed-rate loans offer predictable monthly payments, making budgeting straightforward. Adjustable-rate mortgages (ARMs) start with a lower rate that can change periodically after an initial fixed period. While ARMs may save money in the short term, they carry the risk of higher payments if rates increase.

Tips for Getting a Better Mortgage Rate

Your credit score is the single biggest factor in the rate you qualify for. Aim for a score above 740 for the best rates. Making a larger down payment, typically 20% or more, eliminates private mortgage insurance (PMI) and may secure a lower rate. Shopping around with at least three to five lenders can also save you thousands over the life of the loan. Consider buying discount points if you plan to stay in the home long term, as each point typically reduces your rate by 0.25%.

Frequently Asked Questions

How is a monthly mortgage payment calculated?

A monthly mortgage payment is calculated using the formula M = P[r(1+r)ⁿ] / [(1+r)ⁿ - 1], where P is the principal loan amount, r is the monthly interest rate (annual rate divided by 12), and n is the total number of monthly payments (years times 12).

What is a good mortgage interest rate?

A good mortgage interest rate depends on current market conditions, your credit score, and loan type. Generally, rates between 3% and 7% are common for fixed-rate mortgages. Check with multiple lenders to find the best rate for your situation.

How much house can I afford?

A common guideline is that your monthly mortgage payment should not exceed 28% of your gross monthly income. Factor in property taxes, insurance, and HOA fees in addition to the principal and interest payment.

What is the difference between a 15-year and 30-year mortgage?

A 15-year mortgage has higher monthly payments but significantly lower total interest paid. A 30-year mortgage offers lower monthly payments but costs more in total interest over the life of the loan.

Should I make extra payments on my mortgage?

Making extra payments can save you thousands in interest and help you pay off your mortgage sooner. Even small additional monthly payments can reduce your loan term by several years. Check that your lender has no prepayment penalties first.