Why We Built This Calculator
Transparency vs. Fantasy Numbers
Most HELOC calculators promise you can borrow "up to 90% of your home's value" without mentioning the fine print: credit score requirements, state restrictions, and lender-specific limits that slash those fantasy numbers in half.
We built this calculator because we broker these loans every day. We see the disconnect between what calculators promise and what actually gets approved. Our tool shows you what you can actually borrow, based on real lender matrices — not marketing hype.
$30 trillion in home equity is sitting in American homes. Most of it stays locked because homeowners don't know what they can access. This calculator changes that.
How the Calculator Works
FICO Score Tiers
Your credit score is the single biggest factor in your rate. That "rates as low as 7.25%" headline? That's for 780+ credit. At 720, you're looking at 9%+. Same home, same equity — completely different monthly payment.
Our calculator shows you the actual rate for YOUR credit tier, not the best-case scenario that less than 20% of borrowers qualify for.
CLTV Limits
Combined Loan-to-Value (CLTV) determines how much equity lenders let you access. Higher credit scores unlock higher CLTVs — a borrower with 780+ can often access 85% CLTV, while 680 credit might be limited to 80%.
We also factor in occupancy type (owner-occupied vs. investment) and lien position. Investment properties and 3rd liens have stricter limits that most calculators ignore.
Fixed vs. Variable Rates
Fixed-rate HELOCs lock your rate for the entire loan term — no surprises. Variable-rate HELOCs (Prime + Margin) start lower but can change monthly. We show you both options side by side so you can make an informed choice.
State-Specific Rules
Some states have unique lending restrictions. Texas, for example, caps CLTV at 80% (it's in the state constitution) and doesn't allow variable-rate HELOCs on most properties. Our calculator automatically adjusts for these rules.
What You Need to Qualify for a HELOC
Lenders look at four things, and the calculator above moves on all of them.
Equity. Most lenders lend to 80–85% combined loan-to-value, counting your first mortgage and the new line together. On a $500,000 home with a $300,000 mortgage, an 85% CLTV ceiling puts your maximum line around $125,000 — not the $200,000 of raw equity you technically hold.
Credit score. 680 is a common floor for approval and 740+ is where pricing gets genuinely competitive. Below 680, some lenders will still lend but at a lower CLTV cap and a wider margin.
Debt-to-income. Most lenders want your total monthly debts, including the new line’s payment, under 43–50% of gross income. The line is usually underwritten at a payment based on the full credit limit, not what you plan to draw — a detail that surprises people who assumed borrowing less would help them qualify.
Income documentation and the property itself. Standard income docs, plus an appraisal or an automated valuation. Owner-occupied primary residences get the best terms; second homes and investment properties face lower CLTV caps and higher rates.
Failing one of these doesn’t always mean no. It usually means a smaller line or a higher rate, which is why the calculator shows you a number rather than a yes or a no.
How Long a HELOC Takes, Start to Finish
Two to six weeks is the normal range, and the spread depends mostly on how fast the appraisal happens and how quickly you return documents.
The sequence: application and credit pull, then income and property documentation, then valuation — some lenders use an automated valuation model on lower-CLTV requests and skip the appraisal entirely, which is where the fast end of that range comes from. Then underwriting, then closing.
Two timing rules catch people out. Federal law gives you a three-business-day right of rescission after closing on a line secured by your primary residence, so funds aren’t available immediately even after you sign. And Texas has its own set — a 12-day waiting period between application and closing among them — which is why a Texas HELOC runs longer than the same file in Florida.
If you’re financing something with a deadline, start earlier than feels necessary.
Choosing Your Loan Term
Most borrowers default to 30-year terms because of the lower monthly payment. But look at the numbers:
$200K loan at 9% interest:
- • 30-year term: $1,609/mo — $379K total interest
- • 15-year term: $2,028/mo — $165K total interest
$419/mo more saves you $214K over the life of the loan.
If you can afford the higher payment, a 15-year term often makes financial sense. Use the term toggle in the calculator to see your options.
Frequently asked questions
What is a HELOC?
A HELOC is a revolving credit line secured by your home, which you can draw from, repay, and draw from again during a set draw period. It works more like a credit card than a mortgage — you’re approved for a limit, and you only owe interest on what you’ve actually drawn.
How much can I borrow with a HELOC?
Most lenders lend up to 80–85% of your home’s value, counting your existing mortgage and the new line together. Subtract your mortgage balance from that ceiling and you have your likely maximum. Your credit score moves the ceiling — higher scores often unlock higher combined loan-to-value limits — and some states cap it regardless, most notably Texas at 80%.
Is a HELOC a second mortgage?
Yes. A HELOC is a lien recorded against your home behind your first mortgage, which makes it a second mortgage in position even though it functions as a credit line. That lien position is why HELOC rates run above first-mortgage rates: in a foreclosure, the first lien is paid before the second.
Is HELOC interest tax deductible?
Only when the funds are used to buy, build, or substantially improve the home securing the loan. Under current law, interest on a HELOC used for a kitchen renovation is generally deductible; interest on the same line used to consolidate credit cards or pay tuition is not. Deduction limits apply and this depends on your situation — worth confirming with your tax preparer.
What happens when the HELOC draw period ends?
The line closes to new draws and you enter the repayment period, where the balance amortizes over the remaining term. This is where payments jump. A line that was interest-only at $400 a month during the draw can move to $1,200 or more once principal is included — the single most common unpleasant surprise with this product.
Can I get a HELOC with a 650 credit score?
Sometimes, but expect a lower limit and a higher rate. 680 is a common minimum across lenders, and while some will go below it, they typically compensate with a reduced combined loan-to-value cap and a wider margin over Prime. Improving the score before applying often moves the number more than waiting for more equity does.
How long does it take to get a HELOC?
Two to six weeks in most cases, driven mainly by how the property is valued and how fast you return documents. Add three business days after closing for the federal right of rescission on a primary residence, and more in Texas, which imposes a 12-day waiting period between application and closing.
Ready to Unlock Your Equity?
You've seen your numbers. Now let's make them real. We partner with top lenders including Rocket, Spring EQ, and Figure to find the best fit for your situation.
A 5-minute call with our team will help you understand your options and start the process — no credit pull required.