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PaintingDeck Stain Calculator — How Much Stain Do I Need?
Enter your deck or fence area and the number of coats to estimate gallons of stain. Wood drinks up the first coat, so coverage is lower than wall paint.
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How this calculator works
We multiply length × width for area, multiply by coats, and divide by about 200 sq ft per gallon — typical for deck stain on smooth wood. Rough or thirsty wood covers less.
What changes how much you need
- Bare, weathered, or rough wood soaks up far more — figure 150 sq ft/gal or less on the first coat.
- Don’t forget railings, balusters, and stairs — they add a surprising amount of area.
- Most semi-transparent stains want one thorough coat; overapplying causes peeling.
- Stain when wood is dry with no rain expected for 24–48 hours.
Frequently asked questions
How much does a gallon of deck stain cover?
About 200–300 sq ft per coat on smooth wood, dropping to 150 or less on rough or weathered boards.
How many coats of stain does a deck need?
Usually one good coat for semi-transparent stains. Follow the can — extra coats can peel.
Do I include railings in the area?
Yes. Railings, spindles, and stairs can add 30–50% more surface than the deck floor alone.