The result of your conversion between carreau and cawney appears here
To convert between Carreau and Cawney you have to do the following:
First divide 12900 / (4/3) * (0.09290304*43560) = 2.39074457
Then multiply the amount of Carreau you want to convert to Cawney, use the chart below to guide you.
Symbol: carreau
No description
Symbol: cawney
No description