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Deck Stain Calculator — Surface Area, Coats, Gallons, Containers & Cost

Editable live calculator

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No hidden assumptions. Inputs, units and the working stay visible so you can check the calculation.

Deck length (ft) Deck width (ft) Railing / fascia surface area (sq ft) Stair surface area (sq ft) Number of coats Product coverage (sq ft/gal) Use the product label for the actual wood condition.Project allowance (%) Container size (gal) Price per container (optional)

Calculated result

4.58 gal · 5 containers

Paintable area per coat: 520 sq ft

Coverage demand across 2 coat(s): 1,040 sq ft

Base liquid need: 4.16 gal

Purchased volume after 1 gal container rounding: 5 gal

Optional container price not entered.

Show the working

1. Area = 20 × 20 + 120 + 0 = 520 sq ft.
2. Base gallons = 520 × 2 ÷ 250 = 4.16 gal.
3. Apply 10% allowance = 4.576 gal; round to 5 whole container(s).

Use the exact finish manufacturer coverage for the wood condition and application method. Surface porosity and preparation can materially change real consumption.

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