Estimate your home equity line of credit limit and monthly payments in under 30 seconds.
Type in your home's current estimated market value and your remaining mortgage balance. Use Zillow or a recent appraisal for a reliable value.
Adjust the lender's max LTV (most banks allow 80%) and enter a current HELOC rate estimate. The national average in 2024 is around 9.00%.
The calculator instantly shows your maximum credit line, your current equity, estimated interest-only payments during the draw period, and full P&I payments at repayment.
A home equity line of credit is one of the most flexible financial tools available to US homeowners — but the numbers can be confusing if you've never applied for one. This calculator does the heavy lifting so you can walk into a lender conversation knowing exactly what to expect.
Lenders use your combined loan-to-value (CLTV) ratio to set your maximum borrowing limit. Most major banks cap CLTV at 80% — meaning your first mortgage plus your HELOC cannot exceed 80% of your home's appraised value. If your home is worth $400,000 and you owe $220,000, your maximum borrowing capacity is $400,000 × 80% − $220,000 = $100,000. Credit unions often allow up to 90% CLTV, which can meaningfully increase your available equity — worth comparing when you shop lenders.
Homeowners most commonly tap a HELOC for home renovation projects (the #1 use case), tuition expenses, debt consolidation, and as a flexible emergency reserve. Our HELOC payment calculator can help you model out exactly what you'll owe each month depending on how much you draw. Investors also use HELOCs as bridge financing to purchase additional properties before selling an existing one. If you're comparing options, our HELOC vs home equity loan guide walks through when a lump-sum loan might actually serve you better.
Suppose you bought your home for $320,000 in 2019 and it's now appraised at $480,000. Your remaining mortgage balance is $260,000. At 80% LTV: $480,000 × 0.80 = $384,000 − $260,000 = $124,000 available credit line. If you draw $60,000 at a 9.00% rate and choose interest-only payments during the draw period, your monthly minimum is just $450 — roughly the cost of a car payment. Use our HELOC interest calculator to model what happens when rates move.
Treating a HELOC like a checking account. Because you only pay interest on what you borrow — and many lenders require interest-only minimums during the draw period — it's easy to pull funds casually without a repayment plan. When the draw period ends (typically after 10 years), your balance converts to a fixed repayment schedule. If you've drawn $100,000 and haven't paid down any principal, that repayment shock can be severe. Before drawing, use our HELOC payoff calculator to simulate how long it will take to pay down the balance under different payment scenarios. Also check your home equity position regularly — especially if local property values are softening. For context on how your rate compares to current averages, see our HELOC rate calculator and rate guide.
This calculator uses the standard combined loan-to-value method used by US mortgage lenders.
For monthly payment estimates, we use two formulas: (1) Interest-only payment = (Draw Amount × Annual Rate) ÷ 12. This reflects the minimum payment during most HELOC draw periods. (2) Principal & Interest payment uses the standard amortization formula: P × [r(1+r)^n] ÷ [(1+r)^n − 1], where P is the draw amount, r is the monthly rate, and n is the number of repayment months. HELOC rates are variable and tied to the prime rate — the rate you enter is a snapshot, not a guarantee. All calculations are estimates for planning purposes only.
Multiply your home's current market value by your lender's maximum LTV ratio — typically 80% to 85% — then subtract your remaining mortgage balance. For example, if your home is worth $400,000 and you owe $220,000, at 80% LTV: $400,000 × 0.80 = $320,000 − $220,000 = $100,000 available. Our HELOC calculator does this automatically as you type. Some lenders, particularly credit unions, go up to 90% CLTV for well-qualified borrowers, which can significantly increase your borrowing capacity.
In 2024, a good HELOC rate is generally anything below 8.5% — the low end of the national average range for well-qualified borrowers. Most HELOC rates track the prime rate, which is set by the Federal Reserve. Borrowers with FICO scores above 740, combined LTV below 75%, and steady income typically secure the lowest rates. Shopping at least three lenders — including a local credit union — typically yields better results than going with your existing bank. Use our HELOC rate calculator to model how rate differences affect your monthly cost.
A HELOC is a revolving credit line — you borrow what you need, when you need it, during a 5–10 year draw period, and only pay interest on the outstanding balance. A home equity loan gives you a lump sum upfront with a fixed rate and fixed monthly payments. HELOCs suit ongoing expenses like a multi-phase renovation; home equity loans work better for one-time costs like tuition or debt consolidation where a predictable monthly payment matters. For a detailed side-by-side comparison, see our HELOC vs home equity loan guide.
Most lenders require at least 15–20% equity remaining in your home after the HELOC is established — meaning your CLTV cannot exceed 80–85%. On a $350,000 home, that requires $52,500–$70,000 in equity. Beyond equity, lenders evaluate your credit score (typically 620 minimum, 700+ for the best rates), debt-to-income ratio (usually under 43%), and payment history. Lenders also order an appraisal to confirm current market value, which can work in your favor if local prices have risen since your purchase.
After your draw period ends (usually 5–10 years), you enter the repayment period — typically 10–20 years — during which you can no longer borrow and must pay both principal and interest. If you've been making interest-only minimums, this transition can nearly double your monthly payment. The average American homeowner with a $75,000 HELOC balance going from interest-only to full P&I repayment sees their monthly payment jump from around $562 to over $900. Planning ahead with our HELOC payoff calculator can help you avoid this surprise.
Yes — and it's one of the most popular uses of home equity. With average credit card APRs around 21% in 2024 versus HELOC rates of 8.5–9.5%, the interest savings on a $40,000 balance can exceed $5,000 per year. The critical risk is that you're converting unsecured debt into debt secured by your home. If you run the cards back up after consolidating, you've created a much more dangerous situation. Financial planners recommend this strategy only for borrowers who have also addressed the spending habits that created the debt, and who close or limit the consolidated cards.
HELOC interest is tax-deductible only when funds are used to buy, build, or substantially improve the home securing the loan — per IRS rules effective since the 2017 Tax Cuts and Jobs Act. Using a HELOC for personal expenses, vacations, or debt consolidation does not qualify for the deduction. The deduction applies to combined mortgage debt up to $750,000 (for loans originated after December 15, 2017). Given the complexity, always consult a tax professional before assuming deductibility — the IRS requires you to document that funds were spent on qualifying improvements.
If your home's value drops enough to push your CLTV above the lender's limit, they can legally freeze or reduce your credit line — even if you've never missed a payment. This happened broadly in the 2008–2009 housing crisis, when millions of homeowners found their HELOCs suspended overnight. Your home equity position is worth monitoring regularly, especially in markets where prices have risen sharply in recent years and may correct. This is also why financial advisors caution against using a HELOC as your primary emergency fund — it can be cut off precisely when you need it.
Last updated: November 2024
HELOCCalculator.info was built to give US homeowners a fast, accurate way to estimate their borrowing power before speaking with a lender. Our calculations follow the standard combined loan-to-value methodology used by major US banks and credit unions. The tool is reviewed and updated when the Federal Reserve adjusts rates or when lending standards change. All calculations run locally in your browser — no data is ever sent to a server.