How to Estimate Your Home Equity

You cannot make good decisions about your equity until you know roughly how much you have. The formula is simple — value minus debt — but both halves take a little work to get right.

Step 1: Estimate your home’s market value

Market value is what a willing buyer would pay today, not what you paid, not the tax assessment, and not what your neighbor is asking. Ways to triangulate it:

• Online estimates. Automated valuation models (AVMs) from major real estate sites are a fast starting point. Treat them as a range, not an answer — they can be off by several percent in either direction, and more in unusual markets or for unusual homes.
• Recent comparable sales. Look for homes that sold in the last three to six months, close to yours, with similar size, age, and condition. Three or more good “comps” beat any algorithm.
• A professional opinion. A licensed appraiser typically charges a few hundred dollars for a formal appraisal. Some real estate agents will prepare a comparative market analysis (CMA) at no charge, hoping to earn a future listing.

A practical approach: take two or three AVM figures and a comps review, then use the middle of the range — not the highest number you saw.

Step 2: Add up everything secured by the home

Pull the current payoff balance (not the monthly statement balance) for:

• Your first mortgage
• Any second mortgage or home equity loan
• The drawn balance on any HELOC
• Any recorded liens — tax liens, mechanic’s liens, judgments

Payoff balances are usually available in your loan servicer’s online portal or by phone. They run slightly higher than the statement balance because interest accrues daily.

Step 3: Subtract — then discount for reality

Value minus debt gives gross equity. But if your plan involves selling, what you can actually walk away with is smaller. Selling costs — agent commissions, transfer taxes, title fees, concessions, moving — commonly total somewhere in the range of 6–10% of the sale price. On a $400,000 sale, that could be $24,000–$40,000.

Lenders apply a different haircut. Most will only lend against a portion of your value — often up to 80%, sometimes more or less depending on the product and your finances. The equity you can borrow against is:

Borrowable equity ≈ (home value × lender’s maximum loan-to-value) − current loan balances

Illustration: a $400,000 home with a $250,000 mortgage and a lender cap of 80% LTV → $400,000 × 0.80 = $320,000 ceiling − $250,000 owed = about $70,000 potentially available, even though gross equity is $150,000.

Common estimating mistakes

• Anchoring on the peak. Using the highest value your home ever reached rather than today’s market.
• Ignoring the HELOC. An open line with a drawn balance is debt, even if the payment is small.
• Forgetting selling costs. Gross equity and walk-away cash can differ by tens of thousands of dollars.
• Counting renovations at cost. Improvements rarely add exactly what they cost; some add much less.
• Using the tax assessment. Assessed values are for taxation and can lag or diverge from market value significantly.

How often should you re-estimate?

Once or twice a year is plenty for most owners, plus any time you are considering a refinance, a sale, a loan against the home, or an estate or divorce decision. Keep a simple note of the date, the value sources you used, and the payoff balances — a running record makes trends obvious.

Key takeaways

• Use multiple value sources and take the middle of the range.
• Use payoff balances, and include every debt secured by the home.
• Distinguish gross equity, borrowable equity, and walk-away cash — they can be very different numbers.

This guide is educational only and is not financial, legal, or tax advice.