The amount you can borrow with a HELOC depends on four things: your home’s current value, what you still owe on your mortgage, the lender’s maximum combined loan-to-value ratio, and your credit profile. Here’s how to calculate it yourself before talking to a lender.
The Basic Formula
Most lenders allow a maximum Combined Loan-to-Value (CLTV) ratio of 80–90%. This means the total of all loans against your home cannot exceed 80–90% of your home’s appraised value.
The formula:
Maximum HELOC = (Home Value × Max CLTV%) − Current Mortgage Balance
Use our free HELOC calculator to run these numbers instantly.
Step-by-Step Example
Say your home is worth $400,000 and you still owe $220,000 on your mortgage. Your lender allows 85% CLTV.
Step 1: $400,000 × 0.85 = $340,000
Step 2: $340,000 − $220,000 = $120,000 maximum HELOC limit.
What CLTV Ratio Will Lenders Allow?
| Lender Type | Typical Max CLTV |
|---|---|
| Traditional banks | 80% |
| Credit unions | 85–90% |
| Online lenders | 85–90% |
| Premium credit / high equity | Up to 95% (rare) |
How Your Credit Score Affects Your HELOC Limit
- 760+: Best rates, maximum CLTV offered
- 720–759: Good rates, full CLTV likely available
- 680–719: Standard rates, may face lower CLTV cap
- 640–679: Higher rates, limited lenders
- Below 640: Most lenders will decline
What Lenders Look at Beyond Equity
Debt-to-income ratio (DTI): Most lenders cap this at 43–50%. A high mortgage payment relative to income can limit your HELOC even if you have plenty of equity.
Income verification: You’ll need to prove stable income — W-2s, tax returns, or bank statements for self-employed borrowers.
Employment history: Most lenders want 2+ years in the same field.
Property type: Single-family homes get the best terms. Condos and investment properties face stricter rules.
How to Maximize Your HELOC Limit
- Wait for home value appreciation — a higher appraisal directly increases your limit
- Pay down your mortgage — every dollar of principal paid increases available equity
- Improve your credit score — moving from 720 to 760 can unlock better CLTV terms
- Reduce other debts — lowering your DTI gives lenders more confidence
- Shop multiple lenders — CLTV policies vary significantly
Calculate Your HELOC Limit Now
Use our free HELOC calculator to enter your home value, mortgage balance, and CLTV to see your estimated borrowing limit and projected monthly payments.