Wood Stain Calculator
Estimate stain gallons and cost for decks by wood type
Total surface area to be stained
Number of stain coats to apply
Wood species affects stain coverage
Stain Gallons
—
gallons
Estimated Cost
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USD
Disclaimer: Results are estimates based on standard formulas. Not a substitute for professional advice from a licensed contractor, engineer, or architect. Verify all calculations before making purchasing or construction decisions.
How to Use This Calculator
Stain coverage depends heavily on wood species and porosity. Matching coverage to your wood type ensures you buy enough stain without over-ordering.
- Measure the deck surface area in square feet
- Choose the number of coats (two is typical for even coverage)
- Select your wood type (Pressure Treated, Cedar, or Hardwood)
- Add 10% extra for railings, spindles, and touch-ups
Expert Insights
Smart analysis for your Painting project
Wood Density Tuning
Dense hardwoods absorb stain at 200 sq ft/gal, while softer pressure-treated wood reaches 250 sq ft/gal. AI matches coverage to species.
Weather Window
Apply stain between 50°F and 90°F with no rain forecast for 24-48 hours. Direct sun causes flash-drying and uneven absorption.
Coat Strategy
Two thin coats outperform one thick coat. Back-brush the second coat to work stain into the grain and prevent pooling.
Calculation Formula
Coverage = Hardwood 200 | otherwise 250 (sq ft/gal)
Gallons = ceil(Deck Area x Coats / Coverage x 10) / 10
Cost = ceil(Gallons x $45)
Wood Stain Type Comparison
| Stain Type | Lifespan | Coverage (sq ft/gal) | Cost per Gallon | UV Protection |
|---|---|---|---|---|
| Clear / Toner | 1-2 years | 250 | $35-$50 | Low |
| Semi-Transparent | 2-4 years | 250 | $40-$55 | Medium |
| Semi-Solid | 3-5 years | 225 | $45-$60 | High |
| Solid Color | 3-5 years | 200 | $45-$65 | High |
Authority References
Our calculations are based on guidelines and standards from these authoritative sources:
- Forest Products Laboratory (FPL) — Wood Finishing & Weathering Guidelines. Learn more
- American Wood Protection Association (AWPA) — Treated Wood Use & Care. Learn more
- Master Painters Institute (MPI) — Wood Staining Standards. Learn more
Frequently Asked Questions
How much stain do I need for a 200 sq ft deck?
A 200 sq ft deck typically needs about 2 gallons of stain for two coats on pressure-treated or cedar wood. Hardwoods absorb more, so plan for closer to 2.5 gallons.
How many square feet does a gallon of wood stain cover?
A gallon of stain covers about 250 sq ft on pressure-treated wood and cedar, and roughly 200 sq ft on dense hardwoods that absorb less product per coat.
How long does deck stain last?
Solid stains last 3-5 years, semi-transparent stains 2-4 years, and clear toners 1-2 years. Reapply sooner on horizontal surfaces exposed to foot traffic and standing water.