Most lenders let you borrow up to a combined loan-to-value limit, commonly about 80 to 85 percent of your home’s value, and a few go higher. From that ceiling you subtract what you still owe on your mortgage. The amount left is your borrowing power, and your credit and income can trim it further.
- Your borrowing ceiling is your home value times the lender’s maximum combined loan-to-value, minus your current mortgage balance.
- Combined loan-to-value caps commonly sit near 80 to 85 percent, though some lenders and products stretch higher.
- Total equity is value minus what you owe; tappable equity is only the slice a lender will actually let you borrow.
- Credit score, income, debt-to-income ratio, and property type can lower the amount below the raw cap.
- A lender confirms your value with an appraisal or an automated valuation before finalizing the number.
How Much Can You Borrow Against Your Home?
The short answer is that you can borrow up to your lender’s combined loan-to-value cap on your home, minus the balance you still owe. Combined loan-to-value, often shortened to CLTV, is the total of all loans secured by the home divided by the home’s value. Lenders set a ceiling on that ratio, and everything below the ceiling is potentially available to you.
In practice, that cap is commonly around 80 to 85 percent of your home’s value. Some lenders and some products allow more, occasionally up to 90 percent or higher, but the higher you go, the smaller the safety margin the lender keeps and the more selective the approval becomes. To get a fast estimate tailored to your numbers, the Home Equity Calculator applies this math for you once you enter your value and mortgage balance.
Two homes with the same value can support very different loan amounts. The difference is the size of the mortgage each owner still carries. A large remaining balance eats into the room under the cap, while a nearly paid-off home leaves far more space to borrow.
The Formula: Home Value Times CLTV Minus Your Mortgage
The calculation itself is simple arithmetic. Write it as a single line:
(Home value x maximum CLTV) minus current mortgage balance = your borrowing ceiling.
Say your home is worth 400,000 dollars, your lender allows an 80 percent CLTV, and you still owe 220,000 dollars. Multiply 400,000 by 0.80 to get 320,000. That figure is the most total debt the lender wants secured against the home. Subtract your 220,000 balance, and 100,000 dollars is left. That 100,000 is your borrowing ceiling under this cap.
The order matters. The cap applies to the whole home value first, not to your equity alone. Your existing mortgage does not disappear from the math; it is counted inside the CLTV limit, which is why you subtract it at the end. If you want to check your current payment and balance before running this, the Mortgage Calculator can show where your loan stands today.
Worked Example: Borrowing at 80, 85, and 90 Percent CLTV
The cap the lender uses changes the number more than most people expect. Below, the same home and the same mortgage produce three different ceilings, one for each common CLTV limit. The figures are illustrative and rounded to whole dollars so the arithmetic is easy to follow.
| Maximum CLTV | Home Value x CLTV | Less Mortgage Balance | Borrowing Ceiling |
|---|---|---|---|
| 80 percent | 400,000 x 0.80 = 320,000 | minus 220,000 | 100,000 |
| 85 percent | 400,000 x 0.85 = 340,000 | minus 220,000 | 120,000 |
| 90 percent | 400,000 x 0.90 = 360,000 | minus 220,000 | 140,000 |
Moving from an 80 percent cap to a 90 percent cap raises the ceiling from 100,000 to 140,000 dollars, a 40,000 dollar swing on the very same property. That is why the cap your lender uses is one of the biggest levers on your borrowing power. The chart below shows the same three ceilings side by side.
Equity vs Tappable Equity: Why They Differ
People often assume they can borrow all of their equity. They usually cannot. Total equity is your home value minus everything you owe on it. In the example above, that is 400,000 minus 220,000, or 180,000 dollars of equity. But the lender will not hand over all 180,000, because the CLTV cap forces them to leave a cushion of untouched value in the home.
Tappable equity is the portion you can actually borrow after that cushion is set aside. At an 80 percent cap, only 100,000 of the 180,000 is tappable. The remaining 80,000 is the protected slice the lender keeps between the total debt and the full value. The bar below shows how the 400,000 dollar value divides into your current mortgage, the borrowable slice, and that protected cushion.
This gap between total equity and tappable equity is the single most common surprise for owners exploring a loan. The cushion is not a fee or a penalty. It is the margin the lender protects so that a dip in home prices does not immediately push the combined loans above the property value.
What Else Limits How Much You Can Borrow
The CLTV formula gives you a ceiling, but several other factors can pull your actual offer below it. Treat the formula as the maximum and these limits as the reasons the real number often comes in lower.
Credit Score
Lenders reserve their highest CLTV caps for strong credit. A lower score can mean a lower cap, a higher rate, or both. The Consumer Financial Protection Bureau notes that lenders weigh your credit history when deciding how much home equity borrowing they will approve and on what terms.
Income and Debt-to-Income Ratio
Even if the equity is there, the lender checks that you can afford the new payment. They compare your total monthly debt payments to your gross monthly income, a figure called the debt-to-income ratio. If adding the new payment pushes that ratio too high, the lender may shrink the loan or decline it, regardless of your equity.
Property Type and Occupancy
Your primary residence usually qualifies for the most generous terms. Second homes, investment properties, condominiums, and multi-unit buildings often face lower CLTV caps because lenders view them as higher risk. The property type alone can move your ceiling by several percentage points.
The Appraisal or Automated Valuation
Every part of the formula depends on your home value, and the lender sets that value, not you. They order an appraisal or run an automated valuation model, sometimes called an AVM, to confirm the number. If their figure comes in below your estimate, your entire ceiling drops with it, since a smaller value means a smaller amount under the cap. If you are weighing borrowing against paying the mortgage down faster, the Mortgage Payoff Calculator can show how extra payments build equity over time.
Three Ways to Turn Equity Into Cash
Once you know how much you can borrow, the next question is which product to use. There are three common routes, and each one still answers to the same CLTV math above. This article stays focused on the amount, so the products are named only briefly here.
- Home equity loan: a lump-sum second mortgage with a fixed rate and a set payment.
- HELOC: a revolving line of credit you draw from as needed, usually at a variable rate.
- Cash-out refinance: a new, larger first mortgage that replaces your current one and returns the difference as cash.
The first two are second mortgages that leave your existing loan in place, while a cash-out refinance replaces it entirely. To compare a lump-sum loan against a flexible line, read our sibling guide on the difference between a home equity loan and a HELOC. And because the CLTV cap is really a loan-to-value question, it helps to understand what counts as a good loan-to-value ratio before you apply.
FAQs About Borrowing Against Your Home
How Much Can I Typically Borrow Against My Home?
Usually up to a combined loan-to-value cap of about 80 to 85 percent of your home’s value, minus your current mortgage balance. Some lenders allow more, but your credit and income can lower the amount.
What Is Combined Loan-to-Value?
Combined loan-to-value, or CLTV, is the total of all loans secured by your home divided by the home’s value. Lenders cap this ratio, which sets the ceiling on how much you can borrow.
What Is the Difference Between Equity and Tappable Equity?
Total equity is your home value minus what you owe. Tappable equity is the smaller slice you can actually borrow after the lender leaves a protected cushion below its CLTV cap.
Can I Borrow All of My Home Equity?
Almost never. The CLTV cap forces the lender to leave a cushion of untouched value. In a common 80 percent example, only part of your total equity is available to borrow.
Does My Credit Score Affect How Much I Can Borrow?
Yes. Stronger credit unlocks the highest CLTV caps and better rates. A lower score can mean a smaller cap, a higher rate, or a declined application even when the equity is there.
Who Decides My Home’s Value in the Calculation?
The lender does, using an appraisal or an automated valuation model. If their value comes in below your estimate, your borrowing ceiling drops with it, since the cap applies to their figure.
Why Does a Higher CLTV Cap Let Me Borrow More?
A higher cap leaves a smaller protected cushion, so more of your value sits below the ceiling. On the same home, moving from 80 to 90 percent can add tens of thousands in borrowing room.
Sources
Authoritative Sources Used in This Article
- Consumer Financial Protection Bureau, What is a loan-to-value ratio and how does it relate to my costs: consumerfinance.gov
- Consumer Financial Protection Bureau, What is a home equity loan: consumerfinance.gov
- Consumer Financial Protection Bureau, What is a home equity line of credit (HELOC): consumerfinance.gov
Educational note: This article is general information, not financial, tax, or legal advice. Combined loan-to-value caps, credit and income standards, and home values vary by lender and by your situation, and any loan places a lien on your home. Confirm the exact borrowing limit on your written loan documents and speak with a licensed professional before you borrow against your equity. Reviewed for accuracy by Prof. Dr. Khalil Mudassar, PhD, as part of our editorial review process. Content last reviewed September 9, 2026.
Author
Shakeel Muzaffar is the Founder and Editor-in-Chief of MultiCalculators.com, bringing over 15 years of experience in digital publishing, product strategy, and online tool development. He leads the platform's editorial vision, ensuring every calculator meets strict standards for accuracy, usability, and real-world value. Shakeel personally oversees content quality, formula verification workflows, and the platform's commitment to publishing tools that are genuinely useful for students, professionals, and everyday users worldwide.
