Estimate how much stain you need for your deck project. Enter deck dimensions including railings for complete coverage calculations.
Enter Your Measurements
Results
Stain Needed
2.5
gallons
Deck Floor Area
192
sq ft
Railing Area
120
sq ft
Total Area
312
sq ft
Cost Estimate
per gallon
Estimated Cost
$112.32
Formula
How to Use This Calculator
How to Use
- 1
Enter deck length and width.
- 2
Enter total railing length on all sides.
- 3
Set number of coats (2 recommended for new wood).
- 4
Stain coverage estimated at 250 sq ft per gallon.
Frequently Asked Questions
Frequently Asked Questions
How many coats of deck stain should I apply?
How often should a deck be stained?
In-Depth Guides
Deck Building Guide: Materials, Cost & Calculator (2026)
Complete guide to planning and building a deck. Covers cost per square foot by material, joist spacing, ledger attachment, footings, railing requirements, and permit needs.
How Much Does It Cost to Build a Deck in 2026?
Deck building cost guide for 2026. Compare pressure-treated wood, composite, and Ipe decking by cost per square foot. Includes permit costs and contractor vs DIY savings.
Wood Stain Guide: How to Stain Wood for Decks, Fences, and Interior Projects
How to choose and apply wood stain for different projects — deck stain, fence stain, interior wood stain — with surface prep tips and expected coverage.
Vinyl vs. Composite Decking: Which Is Better for Your Home?
A complete comparison of vinyl and composite decking — cost, appearance, maintenance, longevity, and how each compares to wood decking.
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About This Calculator
This calculator uses the formula: Gallons = (Deck Area + Railing Area) × Coats ÷ 250. All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.
Built and maintained by the CalcSmart team. Last updated March 2026.
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