Sometimes you need to modify the total yield of a formula to obtain a different number of servings of a different size.
For instance, you may have a sauce formula that makes four servings of 2 fl oz/60 mL each, but you want to make twenty 3-fl oz/90-mL servings. To make the conversion:
First determine the total original yield of the formula and the total desired yield.
4 X 2 fl oz = 8 fl oz (total original yield)
20 X 3 fl oz = 60 fl oz (total desired yield)
Then determine the formula conversion factor.