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Deck boards by deck size

Board counts for common deck sizes, computed row by row with real board widths, gaps and stock lengths. For any other size use the deck board calculator.

5 1/2″ boards, 3/16″ gap, boards running along the longer side, joists 16″ o.c. "Buy" adds 10% waste.
Deck	Rows	Best board length	Boards	Buy	Screws
8 × 8 ft	17	8′	17	19	250
8 × 10 ft	17	10′	17	19	322
10 × 10 ft	22	20′	11	12	416
10 × 12 ft	22	12′	22	24	462
12 × 12 ft	26	12′	26	29	546
12 × 16 ft	26	16′	26	29	710
16 × 16 ft	34	16′	34	37	929
10 × 20 ft	22	20′	22	24	740

Method: how many deck boards do I need.