🏡 HELOC Calculator
Calculate your home equity line of credit limit, draw period interest-only payments, repayment period payments, and total interest cost.
How a HELOC Works
A Home Equity Line of Credit (HELOC) is a revolving line of credit secured by your home. Unlike a home equity loan that distributes a lump sum upfront, a HELOC functions like a credit card — you have an approved limit and can borrow, repay, and re-borrow within that limit during the draw period. This flexibility makes HELOCs particularly valuable for expenses that occur in stages, such as a multi-phase home renovation or ongoing tuition payments.
HELOCs have two distinct phases: the draw period (typically 5–10 years) during which you can borrow freely and usually make interest-only payments, followed by the repayment period (typically 10–20 years) during which no new draws are allowed and you must repay the full outstanding balance in principal-plus-interest installments.
How Your HELOC Credit Limit Is Calculated
Lenders use the Combined Loan-to-Value (CLTV) ratio to determine your maximum HELOC credit line. The formula: (Existing Mortgage Balance + Desired HELOC Limit) ÷ Current Home Value must not exceed the lender's maximum CLTV — typically 80–85%, though some lenders approve up to 90% for well-qualified borrowers.
Example: A home worth $450,000 with a $220,000 mortgage balance at 85% max CLTV. Maximum combined debt = $450,000 × 0.85 = $382,500. Subtract the mortgage: $382,500 − $220,000 = $162,500 maximum HELOC line. Your current equity is $230,000, but you can only access $162,500 because lenders require a cushion. This cushion protects lenders if home values decline — they need to be confident they can recover the full combined loan amount in a foreclosure scenario.
Draw Period vs. Repayment Period: Payment Shock Explained
The most financially dangerous aspect of HELOCs is payment shock — the dramatic jump in monthly payments when the draw period ends. During the draw period on a $100,000 HELOC balance at 8.5%, your interest-only payment is $708/month. When the repayment period begins, that same balance requires principal-plus-interest payments over 20 years — approximately $868/month. The jump from $708 to $868 is manageable, but many borrowers make the mistake of drawing the maximum during the draw period without planning for repayment, then face genuine financial strain when principal payments begin.
This calculator shows both your draw period and repayment period payments explicitly, and the payment schedule toggle lets you see every year of the full loan lifecycle. Always verify you can comfortably afford the repayment period payment before borrowing.
HELOC Interest Rates: Variable Rate Risk in 2026
The vast majority of HELOCs carry variable interest rates indexed to the Wall Street Journal Prime Rate plus a margin. As of 2026, with the Prime Rate at approximately 7.5%, typical HELOC rates range from 8.0% to 10.5% depending on your creditworthiness, equity, and lender. The variable rate is both a potential benefit and a meaningful risk: if the Fed cuts rates, your HELOC rate and monthly interest cost drop automatically. But if rates rise, so does every dollar you've drawn.
Rate risk management strategies include: borrowing only what you need rather than the maximum; making principal payments during the draw period to reduce balance before rate increases compound; asking your lender about fixed-rate conversion options (many HELOCs allow you to lock a portion of the balance at a fixed rate); and keeping a cash reserve to absorb payment increases if rates rise unexpectedly.
When entering a rate in this calculator, consider running the numbers at your current rate plus 2% to stress-test your ability to manage worst-case payments.
HELOC vs. Home Equity Loan vs. Cash-Out Refinance
Home equity comes in three main access forms, each with distinct characteristics:
HELOC — variable rate, revolving line, interest-only draw period, flexible borrowing. Best for expenses that occur over time or where you're uncertain of the exact total needed. The flexibility is the defining advantage.
Home Equity Loan (HEL) — fixed rate, lump sum, immediate full repayment begins. Best when you know the exact amount needed and want payment certainty. Rates are typically slightly higher than HELOCs but the fixed-rate certainty is valuable in a rising rate environment.
Cash-Out Refinance — replaces your entire first mortgage with a new, larger loan. Best when current mortgage rates are near or below your existing rate, when you need a large amount, or when you want to consolidate everything into a single loan. Less attractive when current rates are significantly higher than your existing mortgage rate — you'd be refinancing a low-rate mortgage just to access equity.
Tax Deductibility of HELOC Interest
HELOC interest is tax-deductible only when the loan proceeds are used to "buy, build, or substantially improve" the home securing the loan — a restriction imposed by the 2017 Tax Cuts and Jobs Act. If you use your HELOC for a kitchen renovation, the interest qualifies. If you use it for vacation, medical bills, or to pay off credit cards, the interest is not deductible under current law. The deduction applies to combined mortgage and HELOC debt up to $750,000 ($375,000 for married filing separately).
This deductibility for home improvements is a significant advantage over personal loans or credit cards when financing major renovations. However, the tax benefit should be a secondary consideration — verify your planned use qualifies and consult a tax professional before assuming deductibility.
Best Uses of a HELOC
HELOCs work well for home improvements that occur in phases (additions, major remodels), where the staged borrowing flexibility aligns with the project payment schedule; college tuition paid semester-by-semester over four years; business startup funding for entrepreneurs who need access to capital at unpredictable intervals; and as an emergency backstop line — many homeowners establish a HELOC when they have good income and equity, then leave it untouched unless a genuine emergency arises, providing peace of mind at very low cost (most HELOCs have minimal annual fees and no cost if unused).
HELOCs are generally not recommended for: discretionary spending or vacations (the interest cost rarely justifies it and you're putting your home at risk); consolidating credit card debt without first addressing the spending habits that created the debt (many borrowers pay off cards then run them back up while the HELOC balance remains); or situations where you are uncertain about your ongoing income — if your income is variable or job security is uncertain, pledging your home as collateral for a revolving credit line is a meaningful risk to manage carefully.
People Also Ask
Most lenders require a minimum credit score of 620–640 to qualify for a HELOC, though the best rates go to borrowers with 720+ scores. A higher score means a lower margin above Prime Rate, directly reducing your interest cost. Lenders also evaluate your debt-to-income ratio (typically must be below 43%), your employment history, and the amount of equity in your home. If your score is below 680, consider spending 6–12 months improving it before applying — the rate savings can be substantial over the life of the line.
Yes — you can pay down or pay off a HELOC balance at any time without prepayment penalty in most cases. During the draw period, making principal payments (beyond the required interest-only minimum) reduces your balance and the resulting repayment period payment. Some lenders charge an early closure fee (typically $300–$500) if you close the HELOC line entirely within the first 2–3 years — check your agreement. Paying down aggressively during the draw period is excellent financial practice: it reduces interest cost, decreases payment shock at repayment period start, and frees up the credit line for future use.
If your home value drops and your combined LTV ratio exceeds the lender's maximum, the lender can freeze or reduce your HELOC credit line — even if you've never missed a payment. This happened widely during 2008–2009 when many borrowers discovered their lines had been suspended without warning. If you have an undrawn HELOC, consider this risk: the line may not be available precisely when you need it most (during a financial crisis that also affects real estate values). For this reason, homeowners who use a HELOC as an emergency fund should have a secondary cash reserve as well.
HELOC approval typically takes 2–6 weeks from application to funding. The process includes: application and document submission (income verification, tax returns, mortgage statements), home appraisal (1–2 weeks for scheduling and completion), underwriting review (1–2 weeks), and closing with a 3-business-day right of rescission. Some online lenders and credit unions have streamlined this to as little as 5–10 business days. Unlike a full mortgage refinance, HELOC underwriting is generally less complex — no title insurance on the first mortgage, simpler processing — which is why it moves faster and costs less in closing fees (typically $500–$1,500 vs $5,000–$15,000 for a full refinance).
For large amounts, HELOCs almost always offer lower interest rates than personal loans — typically 8–10% vs 12–20% for personal loans. The lower rate is because your home serves as collateral, reducing lender risk. For amounts under $25,000 or where you want to avoid pledging your home, a personal loan may be preferable despite the higher rate. The key tradeoff: a HELOC default can ultimately lead to foreclosure, while a personal loan default damages your credit but cannot cause you to lose your home. If the loan purpose is discretionary spending rather than home improvement or education, many financial advisors recommend against using home equity for this reason.