For typical home equity loans, 80% is the magic number. That's because lenders feel most comfortable when you keep your loan-to-value (LTV) ratio at 80% or below. To calculate your loan-to-value ratio, simply divide the total amount of borrowed money by your home's value.
For example: Let's say your home is worth $100,000 and you have a $60,000 first mortgage. In this case, your LTV would be $60,000/$100,000, or 60%. If you get a $20,000 home equity loan, your LTV goes up to $80,000/$100,000, or 80%.
Higher LTV
As we mentioned earlier, most lenders let your first mortgage and your home equity loan equal 80%. However, some lenders will approve loans of between 80-90% LTV; some lenders even go up to 125% LTV. Of course, the higher your LTV, the higher your interest rate, since high LTV loans are riskier for the lender.