If you purchase a home for $150,000 and put 10% down on a 30 year Fixed Rate Loan, you would be   financing 90% of the purchase price ($135,000). In order to calculate the Private Mortgage Insurance,   you would calculate with the following formula:  

- financed amount * mortgage insurance factor = monthly mortgage insurance
- $135,000 * 0.0079 = $1,066.50
- $1,066.50 / 12 months = $88.88
- Your monthly mortgage insurance would be $88.88. Add this amount to your monthly mortgage payment.