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HELOC Calculator

Calculate your home equity line of credit

Maximum HELOC Available

$125,000

Current Equity

$200,000

Draw Payment

$531/mo

HELOC = Home Equity Line of Credit

Draw period: interest-only • Repayment period: principal + interest

$
$
$
%
Maximum HELOC Available
$125,000
Current Equity: $200,000
Draw Period
$531/mo
Interest Only
Repayment
$651/mo
P&I

Total Interest Cost

$144,958

Interest Cost Comparison

Draw Period Interest$63,750
Repayment Period Interest$81,208
Total Interest Cost$144,958

Frequently Asked Questions

Q

How much HELOC can I get?

Lenders typically allow 80-85% combined loan-to-value (CLTV). Formula: (Home Value × 85%) - Mortgage Balance = Max HELOC. For a $500K home with $300K mortgage: ($500K × 85%) - $300K = $125K available.

  • Most lenders cap CLTV at 80–85%, though some allow up to 90% with excellent credit (740+)
  • Credit score requirements: 680+ minimum, 720+ for best rates and highest LTV limits
  • Debt-to-income ratio (DTI) should be below 43% including the new HELOC payment
  • Get a professional appraisal ($300–$500) – a higher home value directly increases your HELOC limit
  • Some lenders require you to draw a minimum of $10,000–$25,000 at closing
Q

What is the draw period?

The draw period (typically 5-10 years) is when you can borrow from your HELOC and make interest-only payments. After this, the repayment period begins where you pay principal and interest.

  • Draw period: 5–10 years of interest-only payments – borrow and repay as needed
  • Repayment period: 10–20 years of fully amortized principal + interest payments
  • Payment shock: a $75,000 HELOC at 8.5% jumps from $531/mo (interest only) to $651/mo (P&I)
  • You can make principal payments during the draw period to reduce future payment shock
  • Some lenders allow draw period extensions – ask before signing if this matters to you
Q

Are HELOC rates fixed or variable?

Most HELOCs have variable rates tied to the prime rate. Rates can change monthly. Some lenders offer fixed-rate options for portions of your balance. Current rates range from 7-10% depending on credit and LTV.

  • Variable HELOC rates = prime rate + margin (typically 0.5–2.0%), adjusting monthly
  • Rate caps limit increases: per-adjustment cap (1–2%) and lifetime cap (usually 18%)
  • Fixed-rate conversion: some lenders let you lock portions of your balance at a fixed rate
  • A 2% rate increase on $75,000 raises your interest-only payment by $125/month
  • Shop at least 3 lenders – margin spreads can vary 1–2% between banks and credit unions
Q

HELOC vs Home Equity Loan?

HELOC: Revolving credit, variable rate, draw as needed, interest-only during draw period. Home Equity Loan: Lump sum, fixed rate, fixed payments. HELOCs are better for ongoing projects; loans are better for one-time needs.

  • HELOC: pay interest only on what you borrow – ideal for phased renovations or uncertain costs
  • Home equity loan: one lump sum at a fixed rate – better for a known $50,000 kitchen remodel
  • HELOC closing costs: $0–$500; home equity loan closing costs: $2,000–$5,000 (2–5%)
  • Variable HELOC rates carry risk – a 3% increase on $100K adds $250/month
  • Both use your home as collateral – missed payments can lead to foreclosure
FeatureHELOCHome Equity Loan
Rate TypeVariable (most)Fixed
DisbursementRevolving lineLump sum
Draw Period PaymentInterest onlyFull P&I from day 1
Closing Costs$0–$500$2,000–$5,000
Best ForOngoing/phased projectsOne-time large expense
Q

Is HELOC interest tax deductible?

HELOC interest may be deductible if funds are used for home improvements. Interest on funds used for other purposes (debt consolidation, etc.) is generally not deductible. Consult a tax professional.

  • Tax-deductible: interest on HELOC funds used to buy, build, or substantially improve your home
  • Not deductible: interest on funds used for debt consolidation, tuition, or vacations
  • Deduction limit: combined mortgage + HELOC debt up to $750,000 (married filing jointly)
  • Keep receipts and records proving how HELOC funds were spent for IRS documentation
  • At 8% interest on $75,000, the deduction could save $1,350–$2,100/year (22–35% bracket)
Q

What are HELOC closing costs?

HELOC closing costs are typically lower than mortgages: $0-$500 for most lenders. Some charge annual fees ($25-75) or early termination fees if closed within 2-3 years.

  • Many banks waive closing costs entirely if you maintain the HELOC for 2–3 years
  • Appraisal fee: $300–$500 (some lenders accept automated desktop appraisals for free)
  • Annual fee: $25–$75/year – waived by credit unions more often than big banks
  • Early termination fee: $300–$500 if closed within 24–36 months of opening
  • No origination fee on most HELOCs – unlike mortgages that charge 0.5–1% of loan amount

Example Calculations

1$75,000 HELOC for Home Renovation

Inputs

Home Value$500,000
Mortgage Balance$300,000
HELOC Amount$75,000
Interest Rate8.5%
Draw Period10 years
Repayment Period20 years
Max LTV85%

Result

Max HELOC Available$125,000
Current Equity$200,000
Draw Period Payment$531/mo (interest only)
Repayment Payment$651/mo (P&I)
Total Interest Cost$144,958

Equity = $500,000 − $300,000 = $200,000. Max HELOC = ($500,000 × 85%) − $300,000 = $125,000. Borrowing $75,000: draw payment = $75,000 × 8.5% / 12 = $531/mo (interest only for 10 years). Repayment = $75,000 amortized at 8.5% over 20 years = $651/mo. Total interest = $63,750 (draw) + $81,208 (repay) = $144,958.

2$50,000 HELOC at 80% LTV

Inputs

Home Value$400,000
Mortgage Balance$200,000
HELOC Amount$50,000
Interest Rate9.0%
Draw Period10 years
Repayment Period15 years
Max LTV80%

Result

Max HELOC Available$120,000
Current Equity$200,000
Draw Period Payment$375/mo (interest only)
Repayment Payment$507/mo (P&I)
Total Interest Cost$86,284

Equity = $400,000 − $200,000 = $200,000. Max HELOC = ($400,000 × 80%) − $200,000 = $120,000. Borrowing $50,000: draw payment = $50,000 × 9% / 12 = $375/mo. Repayment = $50,000 amortized at 9% over 15 years = $507/mo. Total interest = $45,000 (draw) + $41,284 (repay) = $86,284.

Formulas Used

Maximum HELOC Amount

Max HELOC = (Home Value × LTV Limit) − Mortgage Balance

The maximum you can borrow on a HELOC based on your combined loan-to-value limit.

Where:

Home Value= Current market value of your home
LTV Limit= Maximum combined LTV allowed (typically 80–90%)
Mortgage Balance= Remaining balance on your first mortgage

Draw Period Payment (Interest Only)

Draw Payment = HELOC Amount × (Annual Rate / 12)

During the draw period, you pay interest only on the amount borrowed.

Where:

HELOC Amount= Amount you borrow (up to max HELOC)
Annual Rate= HELOC interest rate (divided by 12 for monthly)

Repayment Period Payment (P&I)

Repay Payment = HELOC × r(1 + r)^n / ((1 + r)^n − 1)

After the draw period, you repay both principal and interest over the repayment term.

Where:

HELOC= Outstanding balance at start of repayment
r= Monthly interest rate (annual rate / 100 / 12)
n= Repayment period in months (repay years × 12)

Total Interest Cost

Total Interest = Draw Interest + Repayment Interest

Sum of interest paid during the draw period and the repayment period.

Where:

Draw Interest= Draw payment × draw period months
Repayment Interest= (Repay payment × repay months) − HELOC balance

HELOC Guide: Draw Periods, Variable Rates, and Payment Strategies

1

How a HELOC Works: Draw Period vs. Repayment Period

$531/month in interest-only payments during the draw period jumps to $651/month in principal-plus-interest during repayment — a 23% increase that catches many homeowners off guard. A HELOC operates in two distinct phases: the draw period (typically 5–10 years) when you can borrow and repay as needed while making interest-only payments, and the repayment period (10–20 years) when the balance amortizes fully.

During the draw period, a $75,000 HELOC at 8.5% costs just $531/month because you’re paying interest only. You can draw, repay, and redraw up to your credit limit — functioning like a giant credit card secured by your home. When the draw period ends, the outstanding balance converts to a standard amortizing loan, and the payment increases to cover both principal and interest.

Planning for the payment transition is critical. Making principal payments during the draw period is optional but highly recommended — paying even $200/month extra toward principal reduces the repayment-period balance by $24,000 over a 10-year draw period. Use a mortgage calculator to compare HELOC repayment payments against refinancing options.

Tip: Make voluntary principal payments during the draw period to reduce payment shock when repayment begins. Even $200/month extra saves thousands in total interest.

2

How Much HELOC Can You Get?

85% combined loan-to-value (CLTV) is the standard maximum most lenders allow. The formula is straightforward: (Home Value × LTV Limit) – Mortgage Balance = Max HELOC. For a $500,000 home with a $300,000 mortgage at 85% CLTV: ($500,000 × 0.85) – $300,000 = $125,000 available.

Credit score, debt-to-income ratio, and employment history all affect the actual limit. A 740+ score typically unlocks 85–90% CLTV and the lowest margin spreads, while 680–739 scores may be capped at 80% CLTV with higher rates. DTI should remain below 43% including the new HELOC payment — a $500/month interest-only HELOC payment on $6,000 monthly income adds 8.3% to your DTI.

Getting a professional appraisal ($300–$500) can significantly increase your borrowable amount. If your home has appreciated from $400,000 to $500,000 since purchase, the extra $100,000 in value translates to $85,000 more at the 85% CLTV tier. Some lenders accept automated desktop appraisals at no cost, but these often undervalue properties.

Home ValueMortgage BalanceMax at 80% CLTVMax at 85% CLTVMax at 90% CLTV
$350,000$200,000$80,000$97,500$115,000
$450,000$280,000$80,000$102,500$125,000
$500,000$300,000$100,000$125,000$150,000
$600,000$350,000$130,000$160,000$190,000
3

Variable Rates: How Prime Rate Affects Your Payment

7–10% is the typical HELOC rate range in 2024–2025, calculated as the prime rate (currently 8.50%) plus a margin of 0.5–2.0% that varies by lender and credit profile. When the Federal Reserve raises or lowers the federal funds rate, the prime rate moves in lockstep, and your HELOC payment adjusts the following month.

Rate volatility is the primary risk of a HELOC versus a fixed-rate home equity loan. A 2% rate increase on a $75,000 balance raises the interest-only draw payment from $531 to $656/month — an extra $1,500 per year. Rate caps limit the damage: most HELOCs have a per-adjustment cap (1–2%) and a lifetime cap (typically 18%), but even capped increases compound quickly on large balances.

Some lenders offer fixed-rate lock options that let you convert a portion of your HELOC balance to a fixed rate. This hybrid approach gives you rate certainty on the locked portion while maintaining revolving access on the rest. Shop at least 3 lenders — margin spreads can vary 1–2% between banks and credit unions, which translates to $750–$1,500/year on a $75,000 balance.

HELOC Payment: Draw Period vs. Repayment$800$700$600$500$400$300$531/moInterest Only$651/moPrincipal + InterestDraw Period (10 yrs)Repayment Period (20 yrs)Draw: $531/mo (interest only)Repay: $651/mo (+23%)$75,000 HELOC at 8.5% interest
4

HELOC vs. Home Equity Loan: Which Is Better?

$0–$500 in closing costs for a HELOC versus $2,000–$5,000 for a home equity loan — the upfront cost difference is dramatic. But total cost over the loan’s life depends on how you use the funds, whether rates rise, and how quickly you repay. The right choice depends entirely on your specific situation.

A HELOC excels for ongoing or phased expenses: home renovations over 12–18 months, college tuition payments over 4 years, or emergency reserves you hope not to use. You pay interest only on the amount drawn, not the full credit limit. A home equity loan is better for a single large expense with a known cost — a $50,000 kitchen remodel, debt consolidation at a fixed rate, or a down payment on an investment property.

The variable-rate risk of HELOCs is real. A 3% rate increase on a $100,000 balance adds $250/month to your interest-only payment. Fixed-rate home equity loans eliminate this uncertainty but lack the flexibility to draw additional funds. Many financial planners recommend using a home equity calculator first to determine total borrowable equity, then comparing both products for the specific use case.

  • HELOC: $0–$500 closing costs, variable rate, revolving credit — best for phased projects
  • Home equity loan: $2,000–$5,000 closing costs, fixed rate, lump sum — best for single expenses
  • HELOC draw period: 5–10 years interest-only, then 10–20 years full amortization
  • Home equity loan: fixed P&I payments from day one, typically 5–30 year terms
  • Both use your home as collateral — missed payments can lead to foreclosure
5

Using the HELOC Calculator: Inputs and Scenarios

$125,000 maximum HELOC available on a $500,000 home with $300,000 mortgage at 85% CLTV — this calculator computes that instantly along with draw-period and repayment-period payments, total interest cost, and current equity. Enter your home value, mortgage balance, desired HELOC amount, interest rate, draw period, repayment period, and LTV limit.

The calculator models both phases: during the draw period, you see the interest-only monthly payment (HELOC amount × annual rate ÷ 12). During the repayment period, it uses the standard amortization formula to show the fully amortized P&I payment. Total interest cost sums both phases — on a $75,000 HELOC at 8.5% with a 10-year draw and 20-year repayment, total interest reaches $144,958.

Run scenarios at different draw amounts: $50,000, $75,000, and your maximum limit. Also test rate sensitivity by adding 2–3% to the current rate to see how future Fed hikes could affect payments. This worst-case planning prevents the payment shock that catches many HELOC borrowers unprepared.

  1. 1

    Enter property details

    Input home value ($500,000) and current mortgage balance ($300,000). The calculator shows your equity ($200,000) and maximum HELOC at your chosen LTV limit.

  2. 2

    Set HELOC terms

    Enter desired draw amount ($75,000), interest rate (8.5%), draw period (10 years), and repayment period (20 years). Most lenders offer 10/20 or 10/15 structures.

  3. 3

    Review both payment phases

    Draw period payment ($531/mo interest only) and repayment period payment ($651/mo P&I) show the 23% payment increase you need to plan for.

  4. 4

    Stress-test with higher rates

    Add 2–3% to the interest rate to simulate Fed rate hikes. At 10.5%, the draw payment jumps from $531 to $656/mo — plan for this before signing.

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Last Updated: Mar 26, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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