Word Formula using IF

I have a small table with 4 or 5 fields that calculate based on the first
fields value. However, I need one field to calculate based on an IF
function.

I know how to write it in excel: =IF(SUM(H9*15%)1500,SUM(H9*15%),1500)

but how do I write something like this in Word? I need to write a formula
that can calculate 15% of the value in cell D1. If it is greater that 1,500,
place the calculated value in this field, if it is not greater than 1,500,
place 1,500 in this field.

Please Help