Home Equity Calculator

Home equity is the portion of your home’s value that you actually own outright, meaning the difference between what it is worth and what you still owe on it. It grows two ways at once: every mortgage payment retires a little principal, and in a rising market the value climbs underneath you. In a normal decade the second does more work than the first, which is uncomfortable to admit but true.

Basic Equity Formula:

Home Equity = Current Market Value − Outstanding Mortgage Balance

Loan-to-Value Ratio (LTV):

LTV = Outstanding Mortgage / Current Market Value × 100%

Lenders use LTV to determine borrowing eligibility. Most HELOCs and Home Equity Loans require LTV ≤ 85% (leaving 15%+ equity untouched).

Maximum Borrowable Equity:

Max HELOC/Loan = (Current Value × 0.85) − Outstanding Mortgage

Equity Growth Over Time:

After each mortgage payment: New Equity = Old Equity + Principal Paid + Appreciation

Worked Example:

• Original purchase: $320,000 (2019)

• Down payment: $64,000 (20%), leaving a starting mortgage of $256,000

• Balance after 5 years of payments: $232,000

• Current market value at 3%/yr appreciation: $320,000 × (1.03)^5 = $370,968

• Current Equity = $370,968 − $232,000 = $138,968

• LTV = $232,000 ÷ $370,968 = 62.5% (comfortably under 85%)

• Max HELOC = ($370,968 × 0.85) − $232,000 = $315,323 − $232,000 = $83,323

Notice how little of that equity came from paying the mortgage down. Five years of payments retired $24,000 of principal, while appreciation added $50,968. That ratio is normal on a 30-year loan, because the early years are mostly interest.

PMI, and a distinction that costs people money

The calculator reports LTV against your current value, which is the right measure for a HELOC or a refinance. Private Mortgage Insurance cancellation uses a different one. Under the Homeowners Protection Act, automatic termination happens at 78% LTV of the original purchase price, on the original payment schedule, and you can request cancellation at 80% of that original price.

Appreciation does not count toward either of those. To use a higher current value to drop PMI you generally have to pay for a new appraisal and ask the servicer, and the rules vary by loan type and by how long you have held it. So a page telling you “LTV 62%, no PMI needed” is telling you what a new lender would think, not what your current servicer will accept without paperwork.

Uses of Home Equity: renovation (which adds value back), debt consolidation, education, emergencies. HELOC interest is tax-deductible only when the money is used to buy, build, or substantially improve the home securing the loan (IRS Publication 936). Consolidating credit cards with it does not qualify, however sensible the arithmetic looks.

Treat equity as a savings account with strings attached. The strings are that the collateral is the roof over your head.