Deck Stain Calculator
How much stain for a deck or fence
Staining a deck or fence? Enter the surface area to estimate the gallons of stain you'll need.
How far does deck stain go?
Coverage depends on wood porosity, but plan on roughly 200–300 ft² per gallon. New or rough wood drinks more. For railings and balusters, add about 20% to your deck floor area.
Transparent, semi or solid
Clear and transparent stains show the most grain but need re-coating most often; semi-transparent balances looks and protection; solid stain hides grain like paint and lasts longest. The more opaque the stain, the further a gallon usually goes and the longer between refreshes.
Prep and timing
Clean and let the deck dry fully first — most stains won't penetrate damp or dirty wood. Apply when it's dry and mild (50–90°F, out of direct midday sun), and avoid staining brand-new pressure-treated lumber until it has dried out for a few weeks to months.
Deck Stain Calculator: frequently asked questions
How much does a gallon of deck stain cover?
About 200–300 square feet on smooth wood; less on rough or weathered boards.
Do I need two coats of stain?
Many stains are designed for one coat; semi-transparent and bare wood often benefit from two.
How often should I re-stain a deck?
Horizontal surfaces that take sun and traffic typically need a fresh coat every 1–3 years; railings last longer. Solid stains last longest, clear sealers the shortest — re-coat when water stops beading on the boards.