How Much Paint Does a Deck Need?
Deck paint coverage depends on the wood species, condition, and porosity of the boards. Rough weathered deck boards absorb significantly more paint than new smooth boards. As a general rule, use 150 to 200 square feet per gallon as your coverage estimate for most deck painting projects.
A standard 12×16 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 including two coats on all surfaces.
New or bare wood absorbs significantly more paint on the first coat. If painting a bare deck for the first time, buy 30% more than calculated. The first coat soaks in heavily and provides less surface coverage than subsequent coats.
Deck Paint Calculator — Reference Table
| Deck Size | Sq Footage | 1 Coat | 2 Coats + Railings |
|---|---|---|---|
| 10×10 | 100 sq ft | 0.7 gal | 1.5 gal |
| 12×16 | 192 sq ft | 1.3 gal | 3.0 gal |
| 16×16 | 256 sq ft | 1.7 gal | 4.0 gal |
| 16×20 | 320 sq ft | 2.1 gal | 5.0 gal |
| 20×20 | 400 sq ft | 2.7 gal | 6.5 gal |
| 20×24 | 480 sq ft | 3.2 gal | 7.5 gal |
Best Deck Paint Products
Behr Premium Deck Over is the most popular deck paint in the US — a thick coating that fills cracks up to ¼ inch and resurfaces weathered decks. Rust-Oleum Deck and Concrete Restore is a similar resurfacing product that adds texture for slip resistance. For a thinner traditional deck paint, Sherwin-Williams SuperDeck Exterior Deck and Dock Coating is a reliable mid-range option.
Always use a paint specifically formulated for decks rather than standard exterior house paint. Deck paint contains additives for slip resistance, flexibility under foot traffic, and resistance to moisture from rain and snow. Standard exterior paint will crack and peel quickly under the stress of regular foot traffic.
Best Deck Paint Colours
Grey and greige tones dominate deck colour trends in 2026. Behr Silver Strand, Sherwin-Williams Flagstone, and Benjamin Moore Rockport Gray are the most popular neutral deck colours. These colours complement most house exterior colours and blend naturally with landscaping.
For a warmer look, medium brown tones like Behr Log Cabin and Sherwin-Williams Kaffee are popular choices that mimic the natural look of stained wood. White and light grey decks are popular on coastal homes and modern exterior designs.
Tips for Painting a Deck
Clean and dry thoroughly first. Pressure wash the deck and let it dry for 48 hours minimum before painting. Any moisture trapped under paint causes rapid peeling.
Sand or scrape all peeling areas. New paint will not bond over old peeling paint. Scrape all loose paint and sand edges smooth before applying a fresh coat.
Prime bare or repaired areas. Spot prime any bare wood, filled holes, or replaced boards before applying the full deck paint coat.
Paint with the grain. Apply deck paint along the length of the boards rather than across them. This gives the most even finish and gets paint into the gaps between boards.
Allow full cure before use. Most deck paints require 24 to 48 hours drying time before light foot traffic and 72 hours before furniture is placed back on the deck.
Related Paint Calculators
- Deck Stain Calculator →
- Fence Paint Calculator →
- Exterior Paint Calculator →
- Paint Cost Calculator →
- Primer Calculator →
- Free Paint Calculator →
Frequently Asked Questions
How much paint do I need for a deck?
A standard 12×16 deck needs 1.3 gallons per coat. For two coats plus railings and stairs buy 3 to 4 gallons. Add 30% extra for bare or weathered wood.
How many gallons of paint for a deck?
A 12×16 deck needs 2 to 3 gallons for two coats. A 16×20 deck needs 4 to 5 gallons. A 20×24 deck needs 6 to 8 gallons including railings.
What is the best paint for a deck?
Behr Premium Deck Over, Rust-Oleum Deck and Concrete Restore, and Sherwin-Williams SuperDeck are the top choices. Always use paint formulated specifically for decks.
How long does deck paint last?
Quality deck paint lasts 3 to 5 years with proper prep. Deck resurfacing products like Behr Deck Over last 4 to 6 years. High traffic areas may show wear sooner.
Should I paint or stain my deck?
Paint provides an opaque colour and hides imperfections. Stain shows the wood grain and is easier to reapply. For weathered or damaged decks, paint or a resurfacing product is the better choice.
How do I prepare a deck for painting?
Pressure wash, let dry 48 hours, scrape all peeling paint, sand rough areas, spot prime bare wood, then apply deck paint on a dry day between 50 and 90 degrees Fahrenheit.