How HELOC & Home Equity Calculator Works
The HELOC & Home Equity Calculator determines how much equity you can access and compares three ways to tap it: a Home Equity Line of Credit (HELOC), a Home Equity Loan (HEL), and a Cash-Out Refinance. Each option has different rate structures, payment timelines, and total costs.
You enter your home value, mortgage balance, and the amount you need. The calculator computes available equity (home value times max LTV minus mortgage balance), then models each borrowing option in detail. For the HELOC, it shows interest-only payments during the draw period followed by fully amortized payments during repayment. For the HEL, it calculates fixed monthly payments over the combined term. For cash-out refinancing, it models a new 30-year mortgage covering both the old balance and the cash-out amount, including closing costs.
The rate scenarios tab shows how HELOC variable rates affect your costs if rates rise 1-3%, helping you decide whether the lower initial payment is worth the risk. Use the Mortgage Refinance Break-Even Analyzer if you want a deeper dive into refinance break-even analysis, or Rent vs Buy Calculator (Advanced) if you're considering selling instead.
Key Terms Explained
- HELOC
- Home Equity Line of Credit. A revolving credit line secured by your home with a variable interest rate. You draw funds as needed during the draw period (5-10 years) making interest-only payments, then repay principal + interest over the repayment period (10-20 years).
- Home Equity Loan (HEL)
- A fixed-rate, lump-sum second mortgage repaid in equal monthly installments. Often called a 'second mortgage' because it's a separate lien from your primary mortgage.
- Cash-Out Refinance
- Replacing your existing mortgage with a larger one at current rates, receiving the difference as cash. You get one payment but reset your mortgage term.
- Loan-to-Value (LTV)
- The ratio of total mortgage debt to home value. Most lenders cap combined LTV at 80-85% for equity products. A $500K home with a $300K mortgage has 60% LTV.
- Draw Period
- The initial phase of a HELOC (typically 5-10 years) during which you can borrow against the credit line and make interest-only minimum payments.
- Repayment Period
- The phase after the draw period ends (typically 10-20 years) when you can no longer borrow and must repay the outstanding balance with fully amortized payments.
Who Needs This Tool
Planning a $75K kitchen remodel and needs to decide between a HELOC (flexible draws as contractors invoice) vs a lump-sum HEL.
Carrying $40K in credit card debt at 22% APR and wants to compare the cost of consolidating via HELOC (8.5%) vs HEL (8%) vs cash-out refi (6.75%).
Worried about rising rates and wants to see how a 2-3% HELOC rate increase compares to locking in a fixed HEL rate today.
Wants to access $50K for a child's wedding but needs the lowest monthly payment during the next 5 years before pension income starts.
Using home equity as a down payment for an investment property and needs to compare borrowing costs across all three options.
Methodology & Formulas
Available Equity = Home Value x Max LTV - Mortgage Balance. HELOC draw period uses interest-only: Balance x Rate / 12. HELOC repayment uses standard amortization: P x [r(1+r)^n / ((1+r)^n - 1)] where r = monthly rate and n = months. HEL uses the same amortization formula over the full term. Cash-out refinance models a new 30-year loan at (old balance + cash-out + closing costs) and compares total interest to keeping the existing mortgage plus a separate equity product.
Pro Tips
- If you need funds gradually over time (renovation phases), a HELOC is ideal because you only pay interest on what you draw. A HEL charges interest on the full amount from day one.
- Fixed-rate HELs beat HELOCs when you expect rates to rise more than 1-2% during your repayment period. Use the Rate Scenarios tab to find your breakpoint.
- Cash-out refinancing only makes sense if your new rate is at or below your current mortgage rate. Otherwise you're paying more on your entire balance just to access equity.
- Most HELOCs have no closing costs, making them the cheapest option for short-term borrowing (under 5 years) even at a slightly higher rate.
- Watch for payment shock: a $50K HELOC at 8.5% costs only $354/mo during the draw period but jumps to $478/mo when repayment begins. Budget for the higher amount.