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Decking for a 20×20 Deck

A 20×20 deck is 400 sq ft — about 61 pressure-treated boards (5.5"×16') plus 4 box of deck screws. Adjust board size below for composite or wider boards.

01 / YOUR MEASUREMENTSUpdate any value
Deck boards
61 boards
Deck area
400 sq ft
Decking boards
61 boards5.5"-wide × 16' PT, incl. 10% waste
Deck screws
4 boxes~1,400 screws (≈3.5/sq ft)
Decking cost (est.)
$1,400~$3.50/sq ft pressure-treated

Planning estimate. Adjust allowances and sample prices for your supplier; tax, delivery, and labor are not included.

BEYOND THE MATERIALS

Make it a complete project

Check the steps, tools, and DIY difficulty before you shop. Your calculator results can be added to My Projects above.

How to Build a Deck →Clean and Refinish a Sound Deck →
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Want the full guide — tools, step-by-step, common mistakes and FAQ? See the Decking Calculator.

Other sizes

Decking for a 8×10 DeckDecking for a 10×10 DeckDecking for a 10×12 DeckDecking for a 12×12 DeckDecking for a 12×16 DeckDecking for a 12×20 DeckDecking for a 14×16 DeckDecking for a 16×16 DeckDecking for a 16×20 DeckDecking for a 12×24 Deck