How much home equity can I borrow against?

Most lenders allow you to borrow up to 80-85% of your home's value combined (first mortgage plus HELOC or home equity loan). With a $420,000 home and $265,000 balance, your available HELOC credit at 80% LTV would be $71,000 ($420K × 80% − $265K).

What is a good amount of home equity?

20% equity (80% LTV) is the first milestone because it eliminates PMI. 50% equity gives you strong borrowing power. 100% equity (paid off) provides maximum security. Most financial advisors recommend maintaining at least 20% equity as a safety buffer.

How long does it take to build home equity?

On a 30-year mortgage, equity builds slowly at first. After 5 years, you've paid off roughly 8% of the principal. After 10 years, about 18%. Home appreciation dramatically accelerates equity building — 3.5% annual appreciation on a $350,000 home adds $12,250 in equity in year one alone.

What is the difference between a HELOC and a home equity loan?

A HELOC (Home Equity Line of Credit) is a revolving line of credit with a variable interest rate — you draw as needed and pay interest only on what you use. A home equity loan is a lump sum with a fixed rate and fixed payments. HELOCs are better for ongoing expenses; home equity loans are better for large one-time costs like renovations.

Home Equity Calculator

Q: How do I calculate my home equity?

Home equity = Current Home Value minus Mortgage Balance. For example, if your home is worth $420,000 and you owe $265,000, your equity is $155,000 (37%). Your equity grows through mortgage payments (which reduce your balance) and home appreciation.

See your current equity, LTV ratio, and how much you could access through a HELOC. Then project how your equity grows year by year as you pay down your mortgage.

Current Home Value

Mortgage Balance

Original Purchase Price

Original Loan Amount

Years Owned

yrs

Your Home Equity

$155,000

36.9% equity · 63.1% LTV

37% equity

63% owed

Home Value

$420,000

Mortgage Balance

$265,000

LTV Ratio

63.1%

Equity %

36.9%

Equity Breakdown

From Down Payment$70,000

From Principal Paid$15,000

From Appreciation$70,000

Appreciation

Purchase Price$350,000

Current Value$420,000

Total Gain+$70,000 (20.0%)

Annualized3.7%/yr

HELOC / Equity Access

80% LTV Limit$336,000

Current Balance$265,000

HELOC Potential$71,000

Max equity access based on 80% LTV

How to Use This Home Equity Calculator

Enter your home details in either tab to understand your equity position:

Current Equity Tab

Enter your Current Home Value (check Zillow or recent sales in your neighborhood), Mortgage Balance (from your last statement), Original Purchase Price, Original Loan Amount, and Years Owned. The calculator shows your total equity, equity percentage, LTV ratio, and breaks down your equity into three sources: down payment, principal paid, and appreciation. It also calculates your HELOC potential based on an 80% LTV limit.

Equity Over Time Tab

This tab adds Current Interest Rate and Years Remaining to project how your equity grows year by year. The calculator uses your historical appreciation rate (calculated from your purchase price and current value) to project future home values alongside your declining mortgage balance. Key milestones — 50% equity, 75% equity, and full payoff — are highlighted.

How Home Equity Is Calculated

Home Equity = Current Home Value − Mortgage Balance
Equity % = Equity ÷ Home Value × 100
LTV = Mortgage Balance ÷ Home Value × 100

Equity comes from three sources:
1. Down Payment (equity at purchase)
2. Principal Paid = Original Loan − Current Balance
3. Appreciation = Current Value − Original Purchase Price

HELOC Potential = (Home Value × 80%) − Mortgage Balance

Projected Home Value = Current Value × (1 + Appreciation Rate)^n
Appreciation Rate = (Current Value ÷ Purchase Price)^(1/Years Owned) − 1

Equity builds through two mechanisms: monthly mortgage payments (most of which go to interest early on) and home appreciation. In the early years of a 30-year mortgage, appreciation often contributes more to equity growth than principal paydown.

Example: Calculating Equity After 5 Years

The Kim Family — Nashville, TN

The Kims bought a $350,000 home in 2020 with 20% down ($70,000). The home has since appreciated to $420,000. Their current mortgage balance is $265,000.

Purchase Price (2020)	$350,000
Down Payment (20%)	$70,000
Original Loan Amount	$280,000
Current Home Value	$420,000
Current Loan Balance	$265,000
Total Equity	$155,000 (36.9%)
Equity from Down Payment	$70,000
Equity from Principal Paid	$15,000
Equity from Appreciation	$70,000
LTV Ratio	63.1%
HELOC Available (80% LTV)	$71,000
Annualized Appreciation	3.7%/year

The Kims could access up to $71,000 through a HELOC without touching more than 80% LTV. They could use this for renovations, debt consolidation, or investments — all at home equity interest rates, which are typically lower than personal loans.

Frequently Asked Questions

Home equity equals your home's current market value minus what you still owe on your mortgage. For example: if your home is worth $420,000 and you owe $265,000, your equity is $155,000 (37%). Your equity grows in two ways: (1) principal paydown from mortgage payments, and (2) home appreciation over time. A purchase price to today's value comparison tells you how much each source has contributed.

Most lenders allow you to borrow up to 80–85% of your home's value combined (your first mortgage plus any HELOC or home equity loan). The formula is: Available HELOC = (Home Value × 80%) − Mortgage Balance. With a $420,000 home and $265,000 balance, you can access $71,000 at 80% LTV. Some lenders go up to 85-90% for qualified borrowers, giving more access but less safety cushion.

Key milestones: 20% equity (80% LTV) eliminates PMI if you haven't already reached it. 25-30% equity makes you a strong candidate for a cash-out refinance. 50% equity indicates you're well into the wealth-building phase. Most financial advisors recommend maintaining at least 20% equity as a buffer against market downturns — if prices fall 10%, you're still above water. In 2008, many homeowners with under 10% equity faced negative equity when prices fell 20-30%.

On a 30-year mortgage at 6.75%, principal paydown is slow at first: you pay off about 8% of the principal in 5 years, 18% in 10 years, and 36% in 15 years. This is because most early payments go to interest. However, appreciation can dramatically accelerate equity growth. At 3.5% annual appreciation, a $350,000 home gains $12,250 in year one alone — often more than a year of principal payments. Making extra principal payments also builds equity faster.

A HELOC (Home Equity Line of Credit) is a revolving credit line with a variable rate — draw as needed during a 5-10 year draw period, then repay over a 10-20 year repayment period. Great for ongoing needs like renovations in phases or an emergency fund. A home equity loan provides a lump sum at a fixed rate, paid back in equal monthly installments. Better for a one-time large expense where you want payment certainty. Both use your home as collateral, so be cautious about borrowing more than you can repay.