Guide
It's a common surprise: you have $200,000 of equity in your home, but a lender will only let you borrow a fraction of it. That's because lenders don't lend against your total equity — they lend up to a percentage of your home's value, keeping a cushion in case prices fall. The two ratios that govern this are LTV and CLTV, and once you understand them you can calculate your realistic borrowing limit in about a minute. This guide explains both ratios, walks through a full worked example, and answers the questions homeowners ask most.
Your total equity is simply your home's value minus what you owe. On a $500,000 home with a $300,000 mortgage, that's $200,000. But borrowable equity is smaller, because lenders require you to leave a slice untouched as protection against a market downturn. Understanding the two ratios below tells you exactly how much of that $200,000 you can actually access.
Loan-to-value (LTV) is your current mortgage balance divided by your home's value. On our example, $300,000 ÷ $500,000 = 60% LTV. The lower your LTV, the more room you have to borrow. LTV is also the ratio lenders used when you first bought the home — it's why a larger down payment meant a smaller loan relative to the price.
Combined loan-to-value (CLTV) counts all loans secured by the home — your first mortgage plus any new HELOC or home equity loan — divided by the home's value. This is the number lenders actually cap when you apply for home equity borrowing. Most set a maximum CLTV of 80% to 85%, though some premium lenders go to 90% or even 95%. The higher the CLTV a lender allows, the more you can borrow — but also the thinner your safety cushion becomes.
To find how much you can borrow: multiply your home value by the lender's max CLTV, then subtract your existing mortgage balance.
| Step | Example (85% CLTV) |
|---|---|
| Home value × max CLTV | $500,000 × 0.85 = $425,000 |
| Minus mortgage balance | $425,000 − $300,000 |
| Maximum you can borrow | $125,000 |
So even though you hold $200,000 in equity, an 85% CLTV lender caps your borrowing at $125,000 — the rest stays as a mandatory cushion.
Using that same $500,000 home with a $300,000 mortgage, here's how the lender's CLTV cap changes what you can access:
| Max CLTV | Total debt allowed | Minus $300k mortgage | You can borrow |
|---|---|---|---|
| 80% | $400,000 | −$300,000 | $100,000 |
| 85% | $425,000 | −$300,000 | $125,000 |
| 90% | $450,000 | −$300,000 | $150,000 |
| 95% | $475,000 | −$300,000 | $175,000 |
Notice how the same home and same mortgage produce a $75,000 swing in borrowing power depending only on the lender's CLTV policy. That's why it pays to compare lenders — and to remember that borrowing at 95% leaves you with just 5% equity, a razor-thin buffer if prices soften.
Your CLTV limit is the ceiling, but lenders also check your credit score, debt-to-income ratio, and income before approving the full amount. A strong profile gets you closer to the cap; a weaker one may get you less than the formula suggests. Your home's appraised value — not your estimate — is what the lender actually uses, so a low appraisal can shrink your borrowing power. The reason lenders keep a cushion at all is that these are secured loans: as the FDIC puts it, "you pledge collateral to secure repayment," and if you can't pay, "the lender can take your collateral" — see the FDIC's consumer loans overview. For a plain-language walk-through of how much equity you can responsibly tap and how lenders weigh an application, the CFPB's guide to using home equity is a good starting point.
Rather than doing the math by hand, the home equity calculator instantly shows your accessible equity at 80%, 85%, 90%, and 95% CLTV so you can see your realistic borrowing range.
Links to Amazon are affiliate links — as an Amazon Associate we earn from qualifying purchases at no cost to you.
The CLTV formula tells you your ceiling, not your target. Borrowing the maximum available almost always means pushing your equity cushion to its thinnest point, which is exactly when a market dip is most dangerous. A homeowner who borrows to 80% CLTV keeps a 20% buffer; one who stretches to 95% keeps just 5%. If home values fall 10%, the first borrower is still comfortably above water while the second is underwater and stuck. The safest borrowers treat the calculated maximum as a boundary they stay well inside, not a goal to hit.
Affordability is the other half of the question. Even if a lender approves you for $125,000, the monthly payment on that amount has to fit your budget alongside your existing mortgage, insurance, taxes, and living costs — and, if you choose a variable-rate HELOC, it has to remain affordable if rates rise. Lenders use your debt-to-income ratio to sanity-check this, but the more important check is your own honest budget. Borrow the amount you need for a specific, worthwhile purpose, confirm the payment is comfortable with room to spare, and leave the rest of your available equity untouched as protection. The home equity calculator and its risk assessment can help you pressure-test both the borrowing limit and whether tapping equity makes sense for your situation at all.
What's the difference between LTV and CLTV? LTV counts only your first mortgage against the home's value. CLTV counts every loan secured by the home — first mortgage plus any second-lien HELOC or home equity loan. When you apply for home equity borrowing, the CLTV cap is the one that limits you.
Why won't a lender let me borrow all my equity? Lenders keep a cushion so that if home prices fall or they ever need to foreclose and sell, the property still covers the outstanding loans. Lending 100% of value would leave them — and you — exposed to being underwater after even a small price dip.
Does a higher appraisal let me borrow more? Yes. Because the CLTV formula multiplies your home's appraised value by the cap, a higher appraisal raises the total debt allowed and therefore your borrowable amount. But the lender uses their appraiser's figure, not yours, so you can't assume a number in advance.
Will paying down my mortgage increase how much I can borrow? Yes. Because your borrowable amount equals your home value times the CLTV cap minus your existing mortgage balance, every dollar you pay down your first mortgage frees up roughly a dollar of additional borrowing room (assuming your home's value holds steady). Rising home values have the same effect from the other direction — as the appraised value climbs, the CLTV cap applies to a bigger number, so your accessible equity grows even if your mortgage balance hasn't changed.
Is home equity the same as the cash I'd walk away with if I sold? Not quite. Your equity is your home's value minus what you owe, but a sale also involves closing costs, agent commissions, and any prepayment items, which reduce the net proceeds. Borrowable equity is smaller still, because the lender's CLTV cap deliberately leaves a cushion in place. Treat the calculator's figures as a realistic borrowing range, and confirm exact numbers with a licensed lender.
→ See how much equity you can access