Deck finish material estimator

Deck Stain Calculator

Estimate deck stain or sealer gallons, cans, coated area, waste, and rough material cost from deck area, railing length, rail height, coats, and product coverage.

Units

Deck surface area (ft²)Railing length (ft)Railing height allowance (ft)Number of coats Coverage per gallon (ft²/gal)Waste / sprayer loss (%)Can or pail size (gal)Cost per can or pail ($)

Stain to buy

Cans or pails

Coated area

Rough cost

Deck stain coverage changes with wood and prep

Wood species, age, porosity, previous coatings, sanding, moisture, rail detail, sprayer loss, and product instructions can change coverage. This is a buying estimate, not a finish specification.

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Deck stain formula

Railing area allowance = railing length × railing height × 2 faces

Coated area = (deck surface + railing allowance) × coats

Order coverage = coated area × (1 + waste %)

Stain gallons = order coverage ÷ coverage per gallon

Sample takeoff

A 320 ft² deck with 60 ft of 3 ft railing, two coats, 250 ft² per gallon, and 10% waste needs about six gallons, or six 1-gallon cans.A 30 m² deck with 18 m of 0.9 m railing, two coats, 6.1 m² per liter, and 10% waste needs about 22.5 liters, or six 4 L cans.

Deck Stain Calculator FAQ

How many gallons of deck stain do I need?+

Add deck surface area and a railing allowance, multiply by coats, add waste, then divide by the coverage on the stain label.Add deck surface area and a railing allowance, multiply by coats, add waste, then divide by the coverage on the stain label.

Should railings be counted separately?+

Yes. Rails, posts, balusters, stairs, and edges can add a lot of coated surface. This calculator uses a simple two-face railing allowance.Yes. Rails, posts, balusters, stairs, and edges can add a lot of coated surface. This calculator uses a simple two-face railing allowance.

Does this work for deck sealer too?+

Yes, if you enter the coverage rate and coat count from the sealer label.Yes, if you enter the coverage rate and coat count from the sealer label.