How do I calculate my available HELOC amount?

Multiply your home's value by the lender's CLTV cap (use 0.85), then subtract your current mortgage balance. Example: a $400,000 home at 85% is $340,000; minus a $250,000 mortgage leaves about $90,000 of available credit line.

What else do I need to qualify besides equity?

Beyond enough equity, most lenders want a credit score around 680 or higher, a debt-to-income ratio under about 43%, and verifiable income. Equity gets you in the door, but credit and income decide your rate and limit.

How much equity do I need for a HELOC?

Q: How much equity do I need for a HELOC?

Most lenders require you to keep at least 15–20% equity in the home after the HELOC, which means a combined loan-to-value (CLTV) cap of 80–85%. In practice you usually need at least 15–20% equity to qualify, and the more you have above that, the larger the line you can open.

Q: Can I get a HELOC with only 10% equity?

It's difficult. Most lenders cap CLTV at 80–85%, so with only 10% equity there is little or no room under the cap. A few lenders allow up to 90% CLTV for strong borrowers, which could leave a small line, but expect a higher rate and stricter terms.

Reviewed by the HomeEquityWise Editorial Team · Last updated June 2026 · How we calculate these numbers

Most lenders want you to keep at least 15–20% equity in your home after a HELOC — which is the same as saying your total borrowing can't push past an 80–85% combined loan-to-value (CLTV). So you generally need 15–20% equity to qualify at all, and the more you have above that, the bigger the line you can open. To find your number: multiply your home's value by 0.85 and subtract what you still owe.

Minimum: ~15–20% equity to qualify (an 80–85% CLTV cap).
Available line = (home value × 0.85) − current mortgage balance.
A few lenders stretch to 90% CLTV for strong borrowers — higher rate, stricter terms.
Equity isn't enough alone: expect a ~680+ credit score and DTI under ~43%.
See your line instantly with the HELOC payment calculator.

The 80–85% rule, in plain math

A HELOC sits on top of your existing mortgage, so lenders look at your combined loan-to-value — every loan against the home, divided by the home's value. They cap that combined figure, usually at 80–85%, to keep a cushion in case prices fall. Whatever room is left under that cap is your potential credit line.

So "how much equity do I need" really has two answers: you need enough equity to clear the cap (15–20% minimum), and the size of your line depends on how far below the cap your current mortgage sits.

Worked example

Your home is worth $400,000 and you owe $250,000. At an 85% CLTV cap, total borrowing can reach $400,000 × 0.85 = $340,000. Subtract the $250,000 you already owe, and your available HELOC is about $90,000. You have $150,000 of raw equity, but the bank's cushion is why you can't tap all of it.

Flip it around: if you owed $340,000 or more on that same home, you'd be at or above the cap and likely wouldn't qualify until you paid the balance down or the home appreciated.

What "enough equity" looks like at different balances

Home value	You owe	Equity	~Available line (85% CLTV)
$400,000	$200,000	$200,000 (50%)	~$140,000
$400,000	$250,000	$150,000 (37%)	~$90,000
$400,000	$300,000	$100,000 (25%)	~$40,000
$400,000	$340,000	$60,000 (15%)	~$0 (at the cap)

Equity gets you in — credit and income set the terms

Clearing the CLTV cap is necessary but not sufficient. To actually approve and price your line, most lenders also want:

Credit score ~680+ (some accept 620, at higher rates and lower CLTV).
Debt-to-income under ~43% — your total monthly debts versus gross income.
Verifiable income and a clean payment history on the home.

Strong credit and low DTI can earn you a higher CLTV and a better rate; weak numbers can shrink your line even when you have plenty of equity.

Frequently asked questions

How much equity do I need for a HELOC?

Generally 15–20% — lenders cap combined loan-to-value at 80–85%, so you keep that much equity after the line. More equity above the minimum means a larger available line.

Can I get a HELOC with only 10% equity?

Hard to. At an 80–85% CLTV cap there's little room left. A few lenders allow 90% CLTV for strong borrowers, leaving a small line at a higher rate.

How do I calculate my available amount?

Home value × 0.85, minus your current mortgage balance. A $400k home at 85% is $340k; minus a $250k mortgage ≈ $90k of available line.

What else do I need besides equity?

Usually a ~680+ credit score, DTI under ~43%, and verifiable income. Equity opens the door; credit and income decide the rate and limit.

Educational only — not financial advice. CLTV caps and credit requirements vary by lender; compare at least three offers. See our methodology.