This decking screw calculator is an approximate only based on two screws across the board for each joist
         
Board & Deck Width      
ADD Board Width (mm) Deck Width (mm)    
  140 1450    
  Boards per width 11 10.06944444  
Joist Spacing & Deck length      
ADD Joist Spacing (mm) Deck Length (mm)    
  400 1350    
  Joist per Length 4 3.341584158  
  Total Section (SQM)      
  1.9575      
Joins per length (0 = full lengths)    
ADD 0      
         
Screws across the board (2 is standard)    
ADD 2      
         
TOTAL SCREWS      
  88