Home & Cooking
Deck Stain Calculator
Estimate gallons of deck stain for a wood deck. Picks coverage by transparent, semi-transparent, or solid stain, adds railing and stair surface area, and shows time, brushes, and cost.
Deck details
Optional pricing (USD)
Leave blank to skip the cost line.
Stain you need
4 gallons
2 gal per coat at 150 sq ft per gallon.
- Deck area
- 192 sq ft
- Total stainable area
- 192 sq ft
- Estimated time
- 2.6 h
- Recommended brushes
- 1
Frequently Asked Questions about the Deck Stain Calculator
Transparent, semi-transparent, or solid stain: which should I pick?
Transparent stains show the most wood grain and soak in deepest, but they cover about 200 sq ft per gallon and only hold up 1 to 2 years before they need a recoat. Semi-transparent (about 150 sq ft per gallon) is the residential default: enough pigment to filter UV, still shows grain, and lasts 2 to 3 years. Solid stains lay down like a thin paint at about 125 sq ft per gallon, hide the grain almost entirely, and last 4 to 6 years on a horizontal deck surface. The trade-off is durability versus how much wood you want to see.
Why does the calculator default to 2 coats?
Two coats is the manufacturer-recommended baseline for almost every exterior deck stain on a new or well-prepped surface. The first coat soaks into the open wood pores and acts as a primer; the second coat builds the film that actually blocks water and UV. A single coat usually looks blotchy and wears off within a year, especially on horizontal surfaces that take the full weight of sun, rain, and foot traffic.
When should I add a third coat?
Bump to 3 coats on older decks where the boards are dry and porous, on south- and west-facing decks that take harsh afternoon sun, and on rough-sawn or freshly sanded wood that drinks stain in unevenly. Coverage drops noticeably on weathered or thirsty wood, so a third coat evens out the color and rebuilds the protective film. New, smooth, well-sealed wood almost never needs a third coat.
Does prep work change how much stain I need?
Yes. A proper wash and light sand can cut stain consumption by 10 to 20 percent compared to staining over a dirty, glossy, or partially failed previous finish. Clean wood accepts the first coat evenly and stops drinking after a thin layer, so more of each gallon ends up as protective film instead of soaking into raised, fuzzy fibers. Skip the prep and the first coat disappears into the wood and the second coat fights to build any sheen.
Oil-based vs water-based deck stain: which is better?
Oil-based stains penetrate deeper, cure slower (24 to 48 hours), and historically last longer on horizontal surfaces, though many regions now restrict their VOC content. Water-based (waterborne) stains dry in 2 to 6 hours, clean up with soap and water, stay flexible as the boards move with humidity, and have closed most of the durability gap in the last decade. Pick water-based for easy maintenance and faster recoats; pick oil for the deepest penetration on older, dry wood.