The Formula below gives an approximate payment.
Loan Amt/1000 * Factor = Monthly Payment
Example Payment Calculation:
Let's say your loan amount is $150,000 and you want the payment for 9.00% for 30 years.
Take the loan amount and divide by 1000 like this... 150,000/1000 = 150
Look up the factor for 9.0% @ 30 years which is 8.046.
Multiply 150 by the factor. 150 * 8.046 = 1206.90
That means your monthly principal and interest payment is $1206.90