Home Equity Calculator
Created by: Natalie Reed
Last updated:
Enter your current home value, purchase price, and outstanding mortgage balance to instantly see your equity in dollars and percentage, LTV ratio, how much you can borrow at 80% or 85% LTV, and total appreciation since purchase.
Home Equity Calculator
FinanceEnter your current home value, purchase price, and mortgage balance to see your equity, LTV, available borrowing power, and total appreciation.
What Is Home Equity and How Is It Calculated?
Home equity is the net ownership stake in your property — what you would receive (before taxes) if you sold today and paid off the mortgage.
It grows through two forces: monthly principal payments that reduce your loan balance, and property appreciation that increases the home's market value.
Equity is both a measure of wealth and a financial resource.
Lenders allow you to borrow against it through HELOCs and home equity loans, typically up to 80–85% of combined LTV.
Understanding your exact equity position is essential before refinancing, tapping home equity, or estimating your net worth.
How to Calculate Home Equity and LTV
The calculation is simple but requires an accurate home value estimate.
For equity, subtract your outstanding mortgage from the current home value.
For LTV, divide the outstanding balance by the home value.
To find how much you can borrow at 80% or 85% combined LTV, multiply the home value by the LTV limit and subtract the outstanding mortgage.
Home Equity Formulas
Current equity = current home value − outstanding mortgage
Equity % = current equity / current home value × 100
LTV = outstanding mortgage / current home value × 100
Available at 80% LTV = (home value × 0.80) − outstanding mortgage
Available at 85% LTV = (home value × 0.85) − outstanding mortgage
Appreciation gain = current home value − purchase price
Example Scenarios
Growing Equity Over 7 Years
Purchased 7 years ago for $320,000 with a 30-year mortgage. Current value: $430,000. Outstanding balance: $275,000. Current equity: $155,000 (36.0%). LTV: 64.0%. Available at 80% LTV: $69,000 (HELOAN). Available at 85% LTV: $90,500 (HELOC limit). Appreciation gain: $110,000.
Recently Purchased Home
Purchased 2 years ago for $400,000, 5% down. Current value: $420,000. Outstanding balance: $372,000. Current equity: $48,000 (11.4%). LTV: 88.6% — above 80%, so no HELOC eligibility yet. Appreciation gain: $20,000. Needs ~$36,000 more in paydown or appreciation to reach 80% LTV.
How People Use This Calculator
- Homeowners deciding whether to tap equity for renovations, education, or debt consolidation.
- Buyers tracking equity buildup to know when they can refinance out of PMI or an FHA loan.
- Real estate investors assessing available leverage across their portfolio.
- Anyone calculating net worth who needs an accurate equity component for their largest asset.
- Couples planning a home sale who want to estimate proceeds before listing.
Tips for Managing Home Equity
Use the current market value, not the purchase price, for an accurate equity calculation.
Your county property assessment is a starting point but can lag the market by 1–2 years.
Use recent comparable sales (your real estate agent or sites like Zillow can help) for a more precise estimate before making borrowing decisions.
Equity is not the same as accessible equity.
Even with 40% equity, lenders cap combined LTV at 80–85%, meaning you cannot borrow your full equity position.
Leave a buffer above the lender's maximum to preserve refinancing options and protect against market fluctuations — a 10% drop in home values can eliminate borrowing capacity quickly.
Frequently Asked Questions
What is home equity?
Home equity is the portion of your home's current market value that you own outright — the difference between what your home is worth and what you still owe on any mortgages or home equity loans secured by it. If your home is worth $450,000 and you owe $280,000, your equity is $170,000, or about 37.8% of the home's value.
How is LTV (loan-to-value) calculated?
LTV = outstanding mortgage balance / current home value × 100. An LTV of 80% means you owe 80% of the home's value and own 20%. Lenders use LTV to assess risk and determine eligibility for refinancing, HELOCs, and home equity loans. Most lenders require LTV to be 80% or below before approving a HELOC or eliminating PMI.
How much equity can I borrow against?
Most lenders allow a combined LTV of up to 80% of your home's value for home equity loans and up to 85% for HELOCs. "Combined" means your first mortgage plus the new loan together cannot exceed that percentage. If your home is worth $500,000, you owe $300,000, and the limit is 80%, you can borrow up to $500,000 × 80% − $300,000 = $100,000.
Does home equity increase over time?
Yes, in two ways. First, as you make mortgage payments, the principal portion reduces your loan balance — building equity through paydown. Second, if your home appreciates in value, your equity grows even if your balance stays the same. In rising markets, appreciation can build equity much faster than principal paydown, especially early in a loan when most payments go to interest.
Can home equity go negative?
Yes — this is called being "underwater" or having negative equity. It happens when property values fall below the outstanding mortgage balance. During the 2008–2012 housing crisis, millions of homeowners found themselves underwater. Negative equity prevents selling or refinancing without bringing cash to closing, and it eliminates HELOC eligibility.
How do I increase my home equity faster?
Four strategies: (1) Make extra principal payments on your mortgage — even $100–200/month meaningfully accelerates paydown. (2) Renovate strategically — kitchen and bathroom updates typically return 70–80% of cost in added value. (3) Wait for natural appreciation in your market. (4) Refinance from a 30-year to a 15-year loan — you build equity about twice as fast, though monthly payments are higher.
Sources and References
- Consumer Financial Protection Bureau (CFPB). Home Equity — What You Need to Know. consumerfinance.gov.
- Federal Reserve Bank of St. Louis. U.S. Households' Real Estate Equity. fred.stlouisfed.org.
- National Association of Realtors. Cost vs. Value Report — Remodeling Impact on Home Value, 2023.