How Much Stain Does a Deck Need?
Deck stain coverage depends on the wood species, the age and condition of the wood, and whether you are applying a transparent or solid stain. Rough weathered deck boards absorb significantly more stain than new smooth boards. As a general rule, use 150 to 200 square feet per gallon as your coverage estimate for most deck staining projects.
A standard 12x16 deck has 192 square feet of floor area. At 150 square feet per gallon, that is 1.3 gallons per coat. For two coats you need 2.6 gallons — buy 3 gallons. Add railings and stairs and the total is typically 3.5 to 4 gallons for a complete deck refinish including two coats on all surfaces.
New or recently stripped bare wood absorbs more stain than previously stained wood in good condition. If staining bare wood for the first time, buy 30% more than calculated. The first coat soaks in heavily and provides less surface coverage than subsequent coats.
Deck Stain Calculator — Reference Table
| Deck Size | Sq Footage | 1 Coat | 2 Coats + Railings |
|---|---|---|---|
| 10x10 | 100 sq ft | 0.7 gal | 1.5 gal |
| 12x16 | 192 sq ft | 1.3 gal | 3.0 gal |
| 16x16 | 256 sq ft | 1.7 gal | 4.0 gal |
| 16x20 | 320 sq ft | 2.1 gal | 5.0 gal |
| 20x20 | 400 sq ft | 2.7 gal | 6.5 gal |
| 20x24 | 480 sq ft | 3.2 gal | 7.5 gal |
Transparent vs Solid Deck Stain
Choosing between transparent and solid stain depends on the condition of your wood. Transparent and semi-transparent stains allow the natural wood grain to show through and work best on new or good condition decks where you want to enhance the natural wood appearance. They penetrate deeply, last 2 to 3 years, and are easy to reapply.
Solid colour stains are opaque and completely hide the wood grain. They are the right choice for older weathered grey decks that have lost their colour, boards with stains or imperfections, or when you want a specific bold colour. Solid stains last 3 to 5 years but are harder to remove if you want to switch back to a transparent finish later.
Best Deck Stains
Cabot Australian Timber Oil is consistently rated the best penetrating deck oil for hardwood and exotic wood decks — it conditions the wood while providing UV and moisture protection. Armstrong Clark Wood Stain is the top-rated semi-transparent stain for pressure treated pine decks with exceptional durability and colour retention. Defy Extreme Wood Stain is a water-based semi-transparent stain that resists mildew and UV fading and is easy to clean up.
For solid colour stains, Behr Premium Solid Colour Waterproofing Stain and Seal at around $45 per gallon is the most popular and affordable option at Home Depot. Sherwin-Williams SuperDeck Solid Colour Stain is the premium choice for maximum durability on high-traffic decks.
How to Prepare a Deck for Staining
Clean the deck first. Use a dedicated deck cleaner or pressure washer to remove dirt, mildew, and grey oxidation. A clean deck stains evenly — a dirty deck stains blotchy.
Let the wood dry completely. Wait at least 48 hours after cleaning or rain before staining. Stain applied to damp wood will not penetrate properly and will peel.
Sand rough or splintered boards. Sand with 60 to 80-grit sandpaper to smooth splinters and open the wood grain for better stain absorption. Sweep away all dust before staining.
Strip old peeling stain completely. Never apply new stain over peeling old stain. Use a deck stripper to remove all old finish before restaining or the new stain will peel in the same spots.
Stain on a cool overcast day. Direct hot sunlight causes stain to dry too fast before it penetrates the wood. Ideal staining temperature is 50 to 80 degrees Fahrenheit with no rain forecast for 24 hours.
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Frequently Asked Questions
How much stain do I need for a deck?
A standard 12x16 deck needs 1 to 1.5 gallons per coat. For two coats plus railings and stairs buy 3 to 4 gallons. Add 30% extra for bare or very weathered wood.
How many gallons of stain for a deck?
A 12x16 deck needs 2 to 3 gallons for two coats. A 16x20 deck needs 4 to 5 gallons. A 20x24 deck needs 6 to 8 gallons including railings. Always add 20% for rough wood absorption.
How often should I stain my deck?
Most decks need restaining every 2 to 3 years. Semi-transparent stain lasts 2 to 3 years. Solid colour stain lasts 3 to 5 years. Decks in harsh climates may need restaining every 1 to 2 years.
What is the best deck stain?
Cabot Australian Timber Oil, Armstrong Clark Wood Stain, and Defy Extreme Wood Stain are consistently top-rated. For solid colour, Behr Premium Solid Colour Waterproofing Stain is the most popular affordable option.
Should I use transparent or solid stain on my deck?
Transparent stain for new or good condition wood to show the natural grain. Solid stain for older weathered or grey wood that needs colour correction. Solid stain is harder to remove later.
How do I prepare a deck for staining?
Clean with a deck cleaner or pressure washer. Let dry for 48 hours. Sand rough boards. Strip any peeling old stain completely. Apply on a cool overcast day between 50 and 80 degrees Fahrenheit.