Find your available home equity, then model a HELOC's interest-only draw-period payment and amortizing repayment-period payment — or a fixed-rate home equity loan's single monthly payment. Total interest, phase-labeled amortization schedule, and charts included.
| # | Phase | Payment | Principal | Interest | Balance |
|---|
Enter Your Home & Equity Details
Choose HELOC or Home Equity Loan mode, fill in the details, then click Calculate to see your available equity and full payment breakdown.
A HELOC calculator and home equity loan calculator in one, this tool starts by working out your available home equity — how much you can borrow against your home before hitting your lender's combined loan-to-value (CLTV) limit. From there, switch between two modes: HELOC mode models a revolving home equity line of credit, with an interest-only draw period followed by an amortizing repayment period; Home Equity Loan mode models a fixed-rate lump sum that starts amortizing from the very first payment.
The two products borrow against the same asset — the equity in your home — but behave very differently day to day. A HELOC works like a credit card secured by your house: you draw what you need, when you need it, up to your credit limit, and during the draw period you typically only owe interest on what you've actually borrowed. A home equity loan works like a traditional second mortgage: you receive the full amount upfront, at a fixed rate, and repay it in equal installments from month one. This calculator makes that distinction concrete by showing you the actual payment numbers side by side, rather than leaving you to guess which structure fits your situation.
Homeowners planning a renovation, consolidating higher-rate debt, funding a large one-time expense, or simply exploring how much equity they have available should all start here. It's equally useful for someone who already knows they want a lump sum (home equity loan) and someone who wants the flexibility of a credit line they may not fully use (HELOC).
Home equity debt is secured by your house, which means missed payments carry a real risk of foreclosure — unlike unsecured debt such as credit cards. Understanding the true cost of borrowing, including the payment jump many HELOC borrowers face when the draw period ends and full amortization begins, is essential before signing. This calculator surfaces that jump directly, alongside the total interest cost across both phases, so it doesn't come as a surprise years into the loan.
Available equity first, then two different payment paths depending on the mode you choose
HELOC mode shows an interest-only draw-period payment followed by a larger amortizing repayment-period payment. Home Equity Loan mode shows one fixed, fully amortizing payment from the first month.
Combined Loan-to-Value is your existing mortgage plus any new home equity debt, as a percentage of home value. This calculator caps your draw or loan amount at your available equity under that limit.
From home value to monthly payment in under a minute
Pick HELOC mode for a revolving line of credit with an interest-only draw period, or Home Equity Loan mode for a fixed-rate lump sum with a standard amortization schedule from day one.
These three shared inputs determine your available home equity: Home Value × CLTV Limit − Existing Mortgage Balance. The default CLTV limit is 80%, a common lender maximum.
In HELOC mode, enter your planned Draw Amount. In Home Equity Loan mode, enter the Loan Amount. Both are automatically capped at your available equity, with a warning if you exceed it.
For a HELOC, enter the variable interest rate, the interest-only Draw Period in years, and the amortizing Repayment Period in years. For a Home Equity Loan, enter the fixed interest rate and the Loan Term in years.
See your available equity, monthly payment(s), total interest across the full schedule, a phase-labeled amortization table, and charts comparing principal borrowed to total interest paid.
A realistic HELOC calculation, step by step — plus the Home Equity Loan comparison
Suppose your home is worth $500,000, you owe $250,000 on your existing mortgage, and your lender caps combined loan-to-value at 80%. You open a HELOC and draw $50,000 at a variable 8.5% rate, with a 10-year interest-only draw period followed by a 15-year amortizing repayment period.
Home Equity Loan comparison: Now suppose instead of a HELOC, you take a Home Equity Loan for the same $50,000 of available equity, at a fixed 7.9% rate over a 15-year term. Using the same amortization formula from month one: M = 50,000 × (0.079 ÷ 12) × (1.006583)¹⁸⁰ / [(1.006583)¹⁸⁰ − 1] ≈ $474.94 per month, with total interest of approximately $35,489.93 over the 15-year term — no draw-period phase, no payment jump, and a single fixed payment throughout.
Explanation: The HELOC's low $354.17 draw-period payment is easy to underestimate — once repayment begins, the payment jumps to $492.37, even though the balance never grew during the draw period. Over its full 25-year life (10-year draw + 15-year repayment), the HELOC in this example costs $81,126.56 in interest. The Home Equity Loan, repaid over just 15 years at a fixed rate, costs $35,489.93 in interest — less in absolute terms partly because it has no interest-only phase and a shorter overall life, illustrating why the lower-looking draw-period payment isn't the full picture.
| Month | Phase | Payment | Principal | Interest | Remaining Balance |
|---|---|---|---|---|---|
| 1 | Draw (Interest-Only) | $354.17 | $0.00 | $354.17 | $50,000.00 |
| 1 | Repayment (Amortizing) | $492.37 | $138.20 | $354.17 | $49,861.80 |
| 2 | Repayment (Amortizing) | $492.37 | $139.18 | $353.19 | $49,722.61 |
What your available equity and resulting CLTV actually tell you about risk
Beyond the payment figures, the most useful number to watch is your resulting combined loan-to-value — your existing mortgage balance plus the new draw or loan amount, divided by your home's value. It's not a formal safety rating, but it's a quick way to gauge how much cushion you'd have if home values softened.
| Resulting Combined Loan-to-Value | General Read | Typical Context |
|---|---|---|
| Under 60% | Comfortable equity cushion | Strong equity position; more resilient to home value declines |
| 60% – 80% | Typical, within most lender limits | Common range for approved HELOCs and home equity loans |
| Over 80% – 90% | Tight equity cushion, higher risk | Little room if home values fall; may face a reduced credit line or refinancing difficulty |
For HELOC borrowers: pay close attention to the gap between your draw-period and repayment-period payments — this calculator shows both so the jump isn't a surprise. If the repayment-period payment would strain your budget, consider paying more than interest-only during the draw period to shrink the balance before amortization begins.
Draw amount vs. total interest: a draw or loan amount well below your available equity, paired with a shorter repayment period or term, generally produces a lower total-interest figure relative to the amount borrowed. A draw or loan amount near your full available equity, a long repayment period, or a high rate all push total interest higher.
Risk considerations: this calculator assumes a constant rate and on-time payments throughout. It doesn't capture real-world risks like a HELOC's variable rate rising during the draw or repayment period, your home's value falling below what secures the debt, or the consequences of missed payments on debt secured by your home. Use the result as a planning estimate, not a final loan offer.
This tool provides general financial estimates for educational purposes only and does not constitute personalized financial, tax, or legal advice. HELOC and home equity loan rates, fees, CLTV limits, and terms vary by lender — confirm final figures with your lender and review your loan disclosures before signing.
Where this calculator earns its keep
Model a HELOC's flexible draws for a multi-phase remodel, or a home equity loan for a single fixed-scope project.
Compare a fixed home equity loan payment against your current combined higher-rate debt payments.
Size a home equity loan for tuition, a wedding, or a major medical expense with a predictable fixed payment.
Open a HELOC as standby credit without drawing it, then model the payment only if and when you actually need it.
Estimate how much equity could fund a down payment on an investment or rental property.
Compare this calculator's HELOC or home equity loan payment against a separate cash-out refinance quote.
Model short-draw-period HELOC financing to bridge the gap between selling one home and buying another.
See what a home equity loan or HELOC draw could contribute toward startup or expansion costs.
Run the same home value and balance through different CLTV limits and rates to compare lender offers.
Model financing for upgrades to a vacation or second property using equity from your primary residence.
What this HELOC & home equity loan calculator does well, and where it can't replace professional advice
Quick-reference comparison of the two home equity borrowing structures
| Feature | HELOC | Home Equity Loan |
|---|---|---|
| Rate type | Usually variable | Usually fixed |
| Disbursement | Revolving credit line, draw as needed | Lump sum, all at once |
| Payment structure | Interest-only during draw period, then amortizing | Fully amortizing from the first payment |
| Best use case | Ongoing or uncertain expenses (phased renovation, standby reserve) | One-time known expense (debt consolidation, major purchase) |
| Typical structure | 5–10 yr draw period + 10–20 yr repayment period | 5–30 yr fixed term |
| Payment predictability | Can change with rate and phase | Fixed for the life of the loan |
Common questions about HELOC and home equity loan calculations
Official guidance to complement this calculator — not a substitute for licensed financial advice
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