Use these deck calculators to calculate the square footage of your deck into linear footage of decking material. The first calculator is for standard or pregrooved decking. Use the second one to calculate tongue and groove porch decking material.
Input Your Square Footage Here 

Linear Footage 
Linear Footage For 5 1/2" Board 
Linear Footage For 3 1/2" Board 
Input Your Square Footage Here 

Linear Footage 
Linear Footage For 5" Face on Board 
Linear Footage For 3" Face On Board 