Home Equity Calculator: How Much Equity Do You Actually Have?

Home equity is simple in theory: it's the portion of your home you actually own. But calculating it accurately requires knowing your current market value and your precise loan balance, and then understanding the rules lenders use to determine how much of that equity you can access.

The Basic Formula

Home Equity = Current Market Value - Outstanding Mortgage Balance

If your home is worth $450,000 and you owe $280,000, your equity is $170,000.

Simple. But both inputs require real numbers.

How to Estimate Your Current Home Value

Your mortgage payoff amount is easy to get (call your servicer or log in online). The current market value is less certain. Options:

Zillow Zestimate / Redfin Estimate: Free, instant, but can be off by 5-10% or more in markets with low transaction volume. Use as a rough starting point.

Comparable sales (comps): Look at homes similar to yours (square footage, beds, baths, condition, neighborhood) that have sold in the last 3-6 months. Zillow and Realtor.com both show recent sales. This is more accurate than the automated estimate.

Formal appraisal: Costs $400-$700, takes 1-2 weeks. Most accurate method. Required by lenders for any equity product.

Broker Price Opinion (BPO): Some lenders offer these free if you're considering a HELOC or cash-out refinance. A licensed agent assesses value based on comps.

Equity Milestone Table

| Original Loan | Rate | Monthly P&I | Equity at Year 5 | Equity at Year 10 | Equity at Year 15 | |--------------|------|------------|-------------------|--------------------|--------------------| | $300,000 | 6.5% | $1,896 | $21,000 | $48,000 | $83,000 | | $350,000 | 6.5% | $2,212 | $24,000 | $56,000 | $97,000 | | $400,000 | 6.75% | $2,594 | $27,000 | $62,000 | $109,000 |

Note: These are principal paydown only. They exclude any appreciation in home value, which historically averages 3-4% annually. Actual equity is typically much higher than principal paydown alone once appreciation is factored in.

The 80% LTV Rule

Lenders generally let you borrow against equity up to 80% LTV (loan-to-value). Combined LTV (CLTV) includes all loans secured by the property.

Maximum borrowing = (Home Value x 0.80) - Current Mortgage Balance

Example:

• Home value: $450,000
• Current mortgage: $280,000
• Maximum equity product: ($450,000 x 0.80) - $280,000 = $360,000 - $280,000 = $80,000

Even though you have $170,000 in equity, you can only borrow $80,000 because lenders require you to maintain 20% equity after the loan.

Some lenders go to 85% or 90% CLTV, but rates are higher and terms stricter above 80%.

HELOC vs Home Equity Loan vs Cash-Out Refinance

Once you know your available equity, you need to choose the right product to access it.

| Feature | HELOC | Home Equity Loan | Cash-Out Refi | |---------|-------|-----------------|---------------| | Loan Type | Revolving line of credit | Fixed lump sum | New first mortgage | | Rate Type | Variable (prime + margin) | Fixed | Fixed | | Current Rates | ~8.5-9.5% | ~8.0-9.0% | ~6.5-7.0% | | Draw Period | 10 years | N/A | N/A | | Repayment | Interest-only during draw | Fixed monthly | Amortized over new term | | Best For | Ongoing expenses, renovation | One-time expense | Replacing high-rate first mortgage | | Closing Costs | Low ($500-$1,500) | Moderate ($1,000-$3,000) | High ($4,000-$10,000) |

HELOC: Best for home improvements, education, or other ongoing needs where you want flexibility. You draw what you need and only pay interest on what you use. Rates are variable and tied to prime.

Home Equity Loan: Best for a one-time large expense (medical bill, major home repair) where you want a fixed payment. Predictable monthly cost.

Cash-Out Refinance: Best if your current mortgage rate is already near or above today's rates. You replace your entire first mortgage with a new one for a higher amount and take the difference in cash. Only makes sense if the new rate is lower than or similar to your current rate.

Tax Deductibility of Home Equity Interest

Interest on home equity loans and HELOCs is deductible only if the proceeds are used to "buy, build, or substantially improve" the property securing the loan. Using a HELOC to pay for a vacation or credit card debt no longer produces a deductible interest expense. Using it to add a room or renovate the kitchen does.

Run the Numbers

Use the HELOC Calculator to model how much equity you can access, what different borrowing scenarios cost monthly, and how long it takes to pay back a home equity product.