HELOC APR Estimate Calculator

Credit Limit

Used for fee calculations if selected.

Initial Draw Amount

Assumes one draw at month 0.

Index Rate (%)

Example: Prime, SOFR-based, or bank index.

Margin (%)

Lender markup added to index.

Rate Floor (%)

Optional minimum rate.

Rate Cap (%)

Optional maximum rate.

Draw Period (years)

Typically interest-only during this time.

Repayment Term (years)

Amortizes remaining balance after draw period.

Origination Fee Basis

Choose how the fee is calculated.

Origination Fee (%)

Enter 0 if none.

Closing Costs ($)

Recording, title, processing, etc.

Other Upfront Fees ($)

Appraisal and miscellaneous fees.

Annual Maintenance Fee ($/year)

Charged at the start of each year (assumed).

Monthly Service Fee ($/month)

Enter 0 if none.

Payment Assumption

Interest-only during draw period

Typical HELOC draw behavior.

Include Ongoing Fees

Include annual fee

Include monthly fee

Uncheck if lender waives fees.

Reset

Example Data Table

Credit Limit	Initial Draw	Note Rate	Draw Years	Repay Years	Upfront Fees	Estimated APR
$60,000.00	$30,000.00	7.500%	10	10	$1,250.00	8.269%
$100,000.00	$50,000.00	7.500%	5	15	$1,450.00	8.142%
$40,000.00	$20,000.00	7.000%	10	5	$1,050.00	7.924%

These examples assume a single draw and a constant rate for illustration.

Note rate: rate = index + margin, then apply floor/cap if provided.
Draw payments (interest-only): payment = balance × (rate/12) plus selected fees.
Repayment payment (amortizing): PMT = PV·r·(1+r)^n / ((1+r)^n − 1), where r is monthly rate.
Estimated APR: build monthly cash flows and solve NPV(IRR) = 0; convert to annual as (1+IRR)^12 − 1.