How to Calculate Your Home Equity

Understand the simple formula and key factors that determine the portion of your home you truly own.

By Garret Merkley · Explainer · Jun 2, 2026

Branched from HELOC Explained: How a Home Equity Line of Credit Works

Quick take

Home equity is the difference between your home's current market value and your outstanding mortgage debt.
It represents the portion of your home you own outright and grows through principal payments and property appreciation.
Calculating it involves estimating your home's value and finding your current mortgage balance.
Equity is a significant part of your net worth and can be a source of funds through loans.

Home equity is the portion of your home that you own outright, free from debt. It represents the financial stake you have in your property. Think of it as the money you would receive if you sold your home today and paid off all outstanding loans secured by it.

The Simple Formula for Home Equity

Home equity is calculated using a straightforward formula: your home's current market value minus your total outstanding mortgage debt.

The Home Equity Formula

Home Value - Total Mortgage Debt = Home Equity

To put this into practice, you need two key pieces of information:

Estimating Your Home's Current Value

Your home's value isn't fixed; it fluctuates with the real estate market. The most accurate way to determine it is through a professional appraisal, which a lender would require for a home equity loan or refinance. However, for a quick estimate, you can look at recent sales prices of comparable homes in your neighborhood, use online valuation tools, or consult with a local real estate agent. Always aim for a realistic, current market value, not just what you originally paid for the home.

Determining Your Total Mortgage Debt

This isn't your original loan amount, but rather the current principal balance you still owe on your mortgage. You can find this number on your monthly mortgage statement or by contacting your loan servicer. If you have any additional loans secured by your home, such as a second mortgage or an outstanding balance on a Home Equity Line of Credit (HELOC), you must include those in your total debt as well.

For example, if your home is currently valued at $450,000 and you have a remaining mortgage balance of $200,000, your home equity would be $250,000 ($450,000 - $200,000 = $250,000).

Why Home Equity Matters
Understanding your home equity is crucial because it represents a significant portion of your personal wealth. As you pay down your mortgage and as your property value potentially increases, your equity grows. This equity can be a valuable asset, allowing you to borrow funds through a home equity loan or a Home Equity Line of Credit (HELOC) for purposes like home improvements, debt consolidation, or other major expenses. It also dictates how much money you might walk away with if you decide to sell your home.

Does my home equity change over time?

Yes, constantly. It increases as you pay down your mortgage principal and as your home's market value appreciates. It decreases if your home's value declines or if you take out additional loans against your home.

Is home equity the same as my down payment?

Your down payment creates your initial equity when you buy the home. However, equity continues to grow (or shrink) from that point based on principal payments and market value changes.

Can I have negative home equity?

Yes, this is sometimes called being “underwater.” It happens if your home’s market value drops below the total amount you owe on all loans secured by the property.

How often should I calculate my home equity?

There’s no fixed schedule. It’s a good idea to check it periodically, perhaps once a year, or whenever you’re considering a financial decision involving your home, such as refinancing or taking out a home equity loan.