Deck Stain Calculator

Estimate stain needed for a deck.

Deck area

Coverage per gallon

Coats

Stain needed (gal) 3

Formula: gallons = area × coats ÷ coverage

Step-by-step with your numbers:

1. Values used:

2. Deck area = 300

3. Coverage per gallon = 200

4. Coats = 2

6. Stain needed = 3gal

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Estimate gallons of deck stain or sealer.

The math behind it

gallons = deck area × coats ÷ coverage per gallon. Rough wood absorbs more (lower coverage).

300 ft², 2 coats, 200 ft²/gal → 3 gallons.

Railings?

Add their surface area separately.