HELOC Calculator — Home Equity Line of Credit

Free HELOC calculator. Calculate your home equity line of credit payments, interest costs, and borrowing power. Home equity loan calculator with amortization.

HELOC Calculator

How to Use

Enter your home value, current mortgage balance, and the HELOC amount you want to borrow.

Enter the interest rate and select draw period (interest-only) and repayment period lengths.

Click Calculate to see monthly payments for both phases, total interest cost, equity breakdown, and yearly amortization schedule.

What is a HELOC?

A HELOC (Home Equity Line of Credit) is a revolving credit line secured by your home equity. You can borrow up to 80-85% of your home value minus your mortgage balance. HELOCs have two phases: a draw period (5-10 years) with interest-only payments, and a repayment period (10-20 years) with principal and interest payments. Current rates typically range from 7-10%.

Complete Guide to HELOCs

How a HELOC Works

A HELOC uses your home as collateral and gives you a revolving line of credit — similar to a credit card but with much lower interest rates because it's secured. During the draw period, you can borrow, repay, and borrow again up to your credit limit. You only pay interest on what you've actually borrowed, not the full credit line. Once the draw period ends, you enter the repayment period where the balance converts to a fixed loan with monthly principal and interest payments.

How to Calculate How Much You Can Borrow

Your HELOC borrowing limit is based on your home equity and the lender's Loan-to-Value (LTV) ratio:

Max HELOC = (Home Value × LTV%) − Mortgage Balance

Example:
Home Value: $400,000
LTV Limit: 80%
Mortgage Balance: $250,000
Max HELOC = ($400,000 × 0.80) − $250,000 = $70,000

Most lenders use 80% LTV, meaning your total debt (mortgage + HELOC) cannot exceed 80% of your home value. Some lenders go up to 85% or even 90% for borrowers with excellent credit.

HELOC vs Home Equity Loan — Which Is Better?

HELOC: Variable rate, revolving credit, borrow as needed, interest-only payments during draw period. Best for ongoing expenses like home renovations, education costs, or emergency fund access.

Home Equity Loan: Fixed rate, lump sum, fixed monthly payments from day one. Best for one-time large expenses like debt consolidation, major renovation, or a known cost.

The key tradeoff: HELOCs offer flexibility but rate uncertainty. Home equity loans offer predictability but less flexibility. If rates are low and stable, a HELOC may save money since you only borrow what you need. If rates are volatile, a fixed home equity loan is safer.

HELOC Interest Rates Explained

Most HELOCs have variable interest rates tied to the prime rate (which follows the Federal Reserve's rate). Your HELOC rate = prime rate + a margin set by the lender (typically 0.5-2%). When the Fed raises rates, your HELOC payment goes up. Some HELOCs offer a fixed-rate conversion option that lets you lock a portion of your balance at a fixed rate. This protects against rate increases but is usually at a slightly higher rate.

The Payment Shock — Draw Period to Repayment

The biggest risk with a HELOC is "payment shock" when the draw period ends. During the draw period, you make small interest-only payments. When repayment begins, your payment can jump significantly because you're now paying principal plus interest. For example, a $50,000 HELOC at 8.5% has a $354/month interest-only payment during draw, but jumps to $434/month during a 20-year repayment period — and that's if rates haven't increased. Our calculator shows both payments so you can plan ahead.

HELOC Requirements and Qualifications

Credit score: Minimum 620-680 (740+ for best rates).

Debt-to-income ratio: Below 43% (total monthly debt payments ÷ gross monthly income).

Home equity: At least 15-20% equity after the HELOC (meaning LTV stays at 80-85% or below).

Appraisal: Lender will order a home appraisal to determine current market value. This typically costs $300-$500 (sometimes waived).

Best Uses for a HELOC

Home improvements: Renovations that increase your home's value (kitchen, bathroom, addition). The interest may be tax-deductible.

Debt consolidation: Paying off high-interest credit cards (18-25%) with a HELOC (7-10%) saves significant interest. But you're converting unsecured debt to secured debt — your home is at risk.

Emergency fund: Having access to a HELOC provides a safety net without needing to liquidate investments.

Education expenses: Can be cheaper than private student loans, but carries more risk since your home secures the debt.

Frequently Asked Questions

What is a HELOC?
A HELOC (Home Equity Line of Credit) is a revolving credit line secured by your home. It works like a credit card — you can borrow up to your credit limit, repay, and borrow again during the draw period. After the draw period ends, you enter the repayment period where you pay back both principal and interest.
How is a HELOC different from a home equity loan?
A home equity loan gives you a lump sum with fixed monthly payments. A HELOC is a revolving line of credit where you borrow as needed with variable payments. HELOCs typically have variable interest rates while home equity loans have fixed rates.
How much can I borrow with a HELOC?
Most lenders allow you to borrow up to 80-85% of your home value minus your mortgage balance. For example, if your home is worth $400,000 and you owe $250,000, your available equity is $150,000. At 80% LTV, your max HELOC would be $70,000 ($400,000 × 80% = $320,000 - $250,000).
What is the draw period vs repayment period?
The draw period (typically 5-10 years) is when you can borrow money and usually make interest-only payments. The repayment period (typically 10-20 years) begins after the draw period ends — you can no longer borrow and must pay back principal plus interest.
Are HELOC payments tax deductible?
HELOC interest may be tax deductible if the funds are used to buy, build, or substantially improve the home securing the loan. Interest on HELOC funds used for other purposes (debt consolidation, vacations, etc.) is generally not deductible. Consult a tax professional for your specific situation.
What is a good HELOC interest rate?
HELOC rates are variable and tied to the prime rate. As of recent years, typical HELOC rates range from 7-10%. Rates depend on your credit score, LTV ratio, and the lender. Some lenders offer introductory rates that are lower for the first 6-12 months.
What happens if my home value drops?
If your home value drops, your equity decreases and the lender may freeze or reduce your HELOC credit limit. In extreme cases, you could owe more than your home is worth (negative equity). This is why it is important not to max out your HELOC.
Can I pay off a HELOC early?
Yes. Most HELOCs have no prepayment penalty. Paying extra during the draw period reduces your balance and interest costs. Some lenders charge an early closure fee if you close the HELOC within the first 2-3 years.
What credit score do I need for a HELOC?
Most lenders require a minimum credit score of 620-680 for a HELOC. A score of 740+ typically gets you the best rates. Lenders also consider your debt-to-income ratio (usually must be below 43%), employment history, and the equity in your home.
Should I get a HELOC or home equity loan?
Choose a HELOC if you need flexible access to funds over time (home renovations, ongoing expenses). Choose a home equity loan if you need a fixed lump sum with predictable payments (debt consolidation, one-time expense). HELOCs have variable rates (riskier); home equity loans have fixed rates (predictable).

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