Deck Stain Calculator
Deck stain calculator for estimating how much stain you need from deck size, railings, coats, coverage, and waste. Get gallons and quarts for ordering.
Inputs
Include railing?
Tip: Coverage varies by wood type and porosity. Check the product label and adjust coverage for rough or weathered boards.
Results
Total square footage
192 sq ft
Includes 192 sq ft deck plus 0 sq ft railing.
Adjusted for coats and waste: 422.4 sq ft
Gallons required
1.69
Quarts equivalent
6.76
FAQ
- Should I count railings in deck stain coverage? If you plan to stain railings, include them or add extra waste.
- Does stain coverage vary by wood type? Yes. Weathered or porous wood absorbs more stain and lowers coverage.
- Do I need two coats of deck stain? Many products recommend two coats for uniform color; follow the label.
Assumptions
- Deck area is length × width of the walking surface.
- Coverage depends on wood type, texture, and product label.
- Waste accounts for overlaps, brush loss, and touch-ups.
- Railing area assumes 3 ft height and 50% picket coverage.
Example
A 16 ft × 12 ft deck with 2 coat(s) needs about 1.69 gallons after waste.