HELOC Payment Calculator: Estimate Your Monthly Payment and Borrowing Power

Calculating a home equity line of credit payment depends on the loan phase. Here is how to run the numbers before you commit.

Quick start: How to use our HELOC payment calculator right now

Our HELOC payment calculator helps real estate investors and new business owners estimate a monthly payment on a home equity line and determine how much they might be able to borrow against existing property.

The calculator asks for six inputs:

• Home value (current market or appraised value)
• Existing mortgage balance (first lien amount)
• Desired credit line amount (how much you plan to draw)
• Interest rate (starting APR)
• Draw period length (years you can access funds)
• Repayment period length (years to pay off the loan balance)

Take a $400,000 home with a $220,000 mortgage. At 8.25% APR with a 10 year draw period and 15 year repayment period, drawing $80,000 gives you an interest only payment of roughly $550 per month. Once the draw period ends, that same balance amortised over 15 years jumps to around $745 per month in principal payments plus interest.

You typically only pay interest during the draw period, which usually lasts 5 to 10 years. Repayment periods can last 10 to 20 years after the draw period.

This tool is intended for illustrative purposes and planning, not a loan offer. Approval is subject to underwriting, credit score, income, and combined loan to value limits. Results based on the data you enter are hypothetical; consult your lender for a guarantee of actual terms.

I'd recommend running the calculator multiple times to test scenarios for BRRRR deals, fix and flip rehabs, or short term rental projects before you apply. Check out our HELOC page and the HELOC Calculator to get started.

How a HELOC payment calculator works (and what your numbers actually mean)

A HELOC is a revolving line of credit secured by your home or investment property. You borrow funds as needed during a draw period, unlike a traditional home equity loan that provides a lump sum payment with fixed monthly payments over the loan term.

The calculator uses your home equity (home's value minus existing mortgage) and a CLTV ratio cap (typically 80% to 85% for owner occupied, 70% to 75% for investment property) to determine borrowing capacity. Lenders use the loan to value ratio to set these limits, and a lower LTV improves chances of HELOC approval. The combined loan to value ratio includes all loans secured by your home.

Borrowing more during the draw period increases the principal balance and monthly interest costs. If you draw $50,000 of a $120,000 equity line of credit at 8.25%, your minimum monthly payment is about $343. Draw $100,000 and it climbs to roughly $687. You only pay interest on the amount you use from a HELOC; the rest of the credit line sits untouched.

HELOCs usually have a variable rate tied to market indices, so interest rates can change depending on economic conditions. Most lenders use the average daily balance method to calculate interest. A fixed rate option through a home equity loan calculator would show a different picture: one time lump sum, level payments, no draw period. Real estate investors should estimate with both to save themselves from rate surprise.

Reading your HELOC payment results: borrowing capacity, monthly payments, and limits

Your results page should answer three questions: how large a line you qualify for, what you pay each month, and how much total interest you owe over time.

Borrowing capacity example: A $500,000 home with a $300,000 first mortgage and an 85% CLTV cap means total debt can reach $425,000. That leaves roughly $125,000 available as a HELOC, subject to credit approval and factors like debt ratio (calculated by dividing total monthly debts by income).

Monthly payment reading: During the draw period, payments are interest only on the outstanding balance. After the draw period ends, monthly payments during the repayment period include both principal and interest. Minimum payment requirements can vary by lender during the draw period. Some HELOC agreements may require balloon payments at the end of the term.

What the estimate excludes: closing costs, annual fees, appraisal fees, rate caps and floors, and early closure fees. These are real expenses that change your effective cost.

Interest rates can increase, causing monthly payments to rise. I reckon you should rerun the heloc calculator under at least three scenarios: base case (current rates), conservative (rate plus 1 to 2 points), and full draw versus partial draw. That stress test tells you whether the deal still works if conditions shift.

HELOCs vs. home equity loans: choosing the right tool for your real estate or business plan

HELOCs have distinct phases (draw period and repayment period) with a variable rate. A home equity loan delivers a lump sum at a fixed rate with level monthly payments from date of funding. As of September 2026, Experian reported average HELOC rates at 7.53% APR versus 7.69% for home equity loans.

When the HELOC payment calculator fits best:

• Phased rehab draws on a fix and flip (you don't know final loan amounts upfront)
• Bridging earnest money deposits on competitive deals
• Variable working capital for a new business or short term rental launch

When a home equity loan makes more sense:

• One time purchase with a known price (equipment, defined renovation budget)
• Debt consolidation where a fixed payment helps with planning

Borrowers with FICO scores of 680 to 720 or higher and verifiable income tend to qualify for better rates. Direct bank HELOCs can sometimes offer lower rates but are often slower to close and may refuse to lend on non owner occupied properties.

Where most investors hit a funding gap (and how Gap Funded helps you close it)

Even when the heloc payment calculator shows strong home equity and manageable payments, most investors still face a shortfall. The HELOC covers part of the stack, but the 20% to 25% down payment on a hard money or DSCR loan, rehab overruns, reserves, or first year operating costs remain unfunded.

Gap Funded fills those gaps without taking equity or placing liens on the deal property. The typical sequence:

1. 0% introductory credit card stacking for flexible purchases and short term cash access
2. Unsecured personal term loans for predictable monthly payment obligations
3. Business lines of credit for ongoing working capital

We use soft credit pulls to review your options, so borrowers with FICO scores around 650 and above can see what is available without impacting their credit score. No equity splits, no lien on the investment property. That is how gap funding is designed to work.

If you have already run your numbers through the calculator, the next step is a quick, no obligation application. Head to gapfunded.com/apply and we will help you build a complete capital stack around your HELOC.