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HELOC Calculator
Calculator
Home Equity Line of Credit

Seven sections. Every angle
of your HELOC decision.

A HELOC is one of the lowest-cost capital sources available to a business owner -- but it puts your home on the line. This calculator runs seven analysis sections to show you the full picture: how much equity you can access, what draw scenarios cost in real dollars, how a rate increase changes your payment, and whether your DTI can support the draw alongside your existing debt.

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Equity & credit limit — Enter your home value, first mortgage balance, and lender CLTV limit. The calculator computes your available equity, maximum HELOC limit, and net usable line after reserves.
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Draw scenarios — Model three different draw amounts side by side. See the interest-only payment during the draw period and the fully amortized payment once repayment begins -- for each scenario.
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Draw vs. repayment timeline — Visualize the full lifecycle of the HELOC: interest-only draw period, the payment step-up at repayment, and total interest paid from open to close.
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Full amortization schedule — Month-by-month amortization table covering both the draw period (interest only) and the repayment period (principal + interest), with remaining balance each month.
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Rate stress test — HELOCs are variable rate. The calculator shows your payment at Prime, Prime+1%, Prime+2%, and Prime+3% so you can see worst-case payment before you draw.
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HELOC vs. other financing — Side-by-side cost comparison against a business term loan, SBA 7(a), and personal loan for the same draw amount. Shows total interest and monthly payment for each.
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DTI analysis — Enter your gross monthly income and existing monthly debt obligations. The calculator computes your front-end and back-end DTI with and without the HELOC payment, and flags QM compliance.
Available EquityCLTVDraw ScenariosInterest-Only PeriodRepayment Step-UpRate Stress TestDTI Analysisvs Business LoanQM Compliance
What this calculator models
7Analysis sections
3Draw scenarios
4Rate stress levels
DTIQM compliance check
7 analysis tabs
EquityAvailable equity, CLTV, and max credit limit.
DrawThree draw scenarios with draw and repayment payments.
TimelineFull draw-to-repayment lifecycle and interest total.
Amort.Month-by-month amortization for the full term.
Rate RiskPayment at Prime, +1%, +2%, +3% scenarios.
vs LoansHELOC vs. term loan, SBA 7(a), personal loan.
DTIFront-end, back-end DTI, and QM threshold check.
For informational purposes only. Not financial, tax, or lending advice. HELOC availability and CLTV limits vary by lender. Consult a mortgage professional before using home equity for business capital.