HELOC Calculator — Home Equity Line of Credit Payment Calculator

What Is a HELOC?

A Home Equity Line of Credit (HELOC) is a revolving line of credit secured by your home equity. Similar to a credit card, a HELOC allows you to borrow funds up to an approved credit limit, repay them, and borrow again during a designated draw period. Because your property serves as collateral, HELOC interest rates are generally lower than unsecured credit cards or personal loans.

How the HELOC Calculator Works

Our HELOC calculator estimates your maximum borrowing limit and monthly payments using your current home value, primary mortgage balance, lender maximum Combined Loan-to-Value (CLTV) limit (typically 80% to 85%), and variable interest rate.

1. Enter Appraised Home Value: Your property's current estimated market value.
2. Enter Outstanding Mortgage Balance: Remaining principal owed on your first mortgage.
3. Select Maximum CLTV Cap: The maximum allowable combined debt ratio (usually 80%).
4. Review Borrowing Limit & Payments: Instant calculation of your maximum credit line and estimated monthly draw payments.

How HELOC Payments Are Calculated

HELOC payments depend on whether you are in the Draw Period or the Repayment Period:

During repayment, payments are calculated using standard loan amortization math across the remaining term (e.g., 20 years) to cover both principal reduction and interest.

HELOC Interest Rate and Payment Factors

Most HELOCs carry variable interest rates tied to the Prime Rate plus a margin determined by your credit score. If the Federal Reserve raises or lowers rates, your monthly HELOC interest payment changes accordingly.

Interest-Only vs. Principal-and-Interest Payments

During the draw period (usually 10 years), most lenders require interest-only payments. While this keeps initial payments low, your principal balance remains unchanged. During the repayment period (15–20 years), you must pay both principal and interest, which increases monthly payments.

How to Use the HELOC Calculator

Use the tab controls above to switch between checking your maximum approved borrowing limit and modeling a detailed repayment schedule. Adjust the drawn amount slider to see how borrowing a portion of your line affects monthly cash flow during draw and repayment phases.

Example HELOC Calculation

Suppose your home is appraised at $500,000, your current mortgage balance is $300,000, and your lender permits an 80% CLTV limit:

• Max Total Borrowing Allowed (80% of $500,000): $400,000
• Minus Existing Mortgage: -$300,000
• Max HELOC Credit Limit: $100,000
• Interest-Only Payment at 8.5% APR (on $50,000 draw): ~$354/month
• Repayment Payment at 8.5% APR (over 20 years): ~$434/month

HELOC vs. Home Equity Loan

A HELOC is a revolving, variable-rate line of credit that you can draw from as needed. A Home Equity Loan provides a single upfront lump sum with a fixed interest rate and predictable monthly payments.

HELOC vs. Cash-Out Refinance

When tapping your home equity, homeowners frequently compare a Home Equity Line of Credit (HELOC) against a Cash-Out Refinance:

• Primary Mortgage Status: A HELOC functions as a second mortgage that leaves your existing primary mortgage (and its low interest rate) completely untouched. A cash-out refinance replaces your current primary mortgage with an entirely new, larger primary loan.
• Borrowing & Payment Structure: HELOCs offer revolving credit with variable interest rates and low interest-only payments during the draw period. Cash-out refinances pay out a lump sum upfront at a fixed rate with standard amortized principal-and-interest payments.
• Closing Costs & Fees: HELOCs typically involve minimal closing costs (or zero upfront fees). Cash-out refinances incur standard primary mortgage closing costs (often 2% to 5% of the total new loan balance).

Homeowners should compare current market interest rates, existing primary mortgage rates, closing costs, and long-term payoff timelines when deciding between a HELOC and a cash-out refinance.

Factors That Affect HELOC Payments

• Drawn Principal Amount: Higher withdrawals increase monthly interest obligations.
• Variable Benchmark Rates: Prime rate adjustments directly change your APR.
• Combined LTV (CLTV) Ratios: Lenders set caps between 75% and 90% based on underwriting criteria.
• Credit Score & Income: Higher credit scores unlock lower margin add-ons.