Deck Stain Calculator
Calculate gallons of deck stain or sealer needed based on deck area and product type
Deck Dimensions
Product & Conditions
Enter your deck dimensions to calculate stain needed
Tips & Notes
- •Clean and strip old finish before restaining — new stain won't bond over old peeling finish.
- •Rough or weathered wood absorbs more stain than smooth new wood — account for this.
- •Apply stain in shade or on a cool day — sun dries stain too fast before it can penetrate.
- •Semi-transparent stain shows wood grain and typically lasts 2–4 years. Solid stain lasts 4–6 years.
- •Back-roll or brush after spraying to ensure penetration. Don't let puddles sit.
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Materials & Supplies
Tools You'll Need
Pro tips for deck stain
- ›Clean and strip old finish before restaining — new stain won't bond over old peeling finish.
- ›Rough or weathered wood absorbs more stain than smooth new wood — account for this.
- ›Apply stain in shade or on a cool day — sun dries stain too fast before it can penetrate.
- ›Semi-transparent stain shows wood grain and typically lasts 2–4 years. Solid stain lasts 4–6 years.
- ›Back-roll or brush after spraying to ensure penetration. Don't let puddles sit.
Frequently asked questions
How many gallons of deck stain do I need?▾
One gallon covers 150–300 sq ft of deck depending on wood porosity and stain type. A 200 sq ft deck typically needs 1–2 gallons for one coat. Add an extra quart for railings, posts, and steps. Rough or weathered wood absorbs much more than smooth new wood.
Solid vs. semi-transparent stain — which lasts longer?▾
Solid stain lasts 4–6 years and hides grain (looks more like paint). Semi-transparent stain lasts 2–4 years and shows wood grain. Clear sealers last 1–2 years and offer least UV protection. Solid lasts longest but is hardest to remove when refinishing.
When should I stain my deck?▾
Best conditions: 50–80°F, dry weather, no rain in the 24 hours after application, no direct sun (which can cause stain to dry before penetrating). Spring and fall are typically ideal. Allow new pressure-treated lumber to dry 1–3 months before staining.
How much does deck stain cost?▾
Quality deck stain runs $35–$60/gallon (semi-transparent or solid). Premium stains like Sikkens, Cabot, and TWP run $50–$80/gallon. A typical 200 sq ft deck restain DIY: $80–$150 in stain + brushes/rollers. Professional restain: $2–$5/sq ft including prep.
Do I need to strip old stain before restaining?▾
Yes, if the existing finish is peeling, flaking, or you're switching from solid to semi-transparent. Use a deck stripper and brightener. If the previous coat is intact and you're applying the same type, just clean and recoat. Never apply oil-based stain over water-based without prep.