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Deck Stain for a 20×20 Deck

A 20×20 deck is 400 sq ft — about 4 gallons of stain for two coats (bare boards drink the first coat). Adjust coats below.

01 / YOUR MEASUREMENTSUpdate any value
Stain to buy
4 gal
Deck area
400 sq ft
Stain (2 coats)
3.2 gallonsbuy 4 gal
Coverage
250 sq ft / gallonper coat on bare decking
Stain cost (est.)
$140~$35/gal

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.

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Want the full guide — tools, step-by-step, common mistakes and FAQ? See the Deck Stain Calculator.

Other sizes

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