A deck stain calculator estimates how many gallons of stain or sealer you need based on your deck size, wood condition, and number of coats.
Deck Dimensions
Stain Options
How to Calculate Deck Stain
Deck stain coverage varies significantly based on wood porosity and condition. New pressure-treated lumber absorbs much more stain than previously stained surfaces in good condition.
Application Tips
Apply deck stain on a dry day with temperatures between 50-90°F. Avoid direct sunlight during application — the stain can dry too fast and leave lap marks. Work in manageable sections and maintain a wet edge.
Coverage estimates are approximate. Check your product label for manufacturer's specific coverage rate.
FAQ
How much deck stain do I need per square foot?
Most deck stains cover 150-400 sq ft per gallon depending on wood porosity and whether it's a first application or recoat. New or bare wood absorbs more stain (150-200 sq ft/gal). Previously stained decks in good condition need less (250-400 sq ft/gal).
Should I apply one or two coats of deck stain?
New or bare wood typically benefits from two coats. Previously stained surfaces in fair condition usually only need one fresh coat. Check the product label for the manufacturer's recommended coverage.
How often should I restain my deck?
Horizontal deck boards typically need restaining every 1-3 years depending on sun exposure, foot traffic, and climate. Vertical surfaces last longer. If water stops beading on the surface, it's time to restain.
What is the difference between transparent, semi-transparent, and solid stain?
Transparent shows the most wood grain, lasts least. Semi-transparent shows some grain, good balance of color and protection. Solid stain covers grain completely, offers most UV protection, lasts longest but can peel over time.
Is this calculator free?
Yes, completely free with no signup required.