Stain Calculator Deck
Calculate the amount of stain needed for your deck based on dimensions, wood type, and number of coats.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Deck Stain Calculator
- Enter Deck Dimensions – Input the Length and Width of your deck in feet (e.g., 20 and 12). Use decimal values if needed (e.g., 12.5).
- Select Wood Type – Choose the option that matches your deck’s surface:
- Smooth Wood (e.g., Cedar, Redwood) – factor 1.0
- Rough Wood (e.g., Pressure-Treated) – factor 1.2
- Very Rough Wood (e.g., Old Deck) – factor 1.5
- Set Number of Coats – Enter how many coats you plan to apply (1 to 5). The default is 2.
- Adjust Stain Coverage – Input the coverage rate in square feet per gallon (default is 300). Check your stain can for the exact value.
- Calculate – Click the Calculate button. The result shows the total gallons needed (rounded up to one decimal). A detailed formula explanation appears below the result.
Tip: All inputs must be positive numbers. If you see an error, correct the highlighted field and recalculate.
Previous Results
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Frequently Asked Questions
Measure the length and width of your deck in feet. For irregular shapes, break the deck into rectangles and sum the areas.
Smooth wood (e.g., cedar, redwood) has a factor of 1, rough wood (e.g., pressure-treated) has 1.2, and very rough wood (e.g., old deck) has 1.5. This adjusts for absorption.
Typically, two coats are recommended for even coverage and durability. Some stains may require only one coat; check the manufacturer's instructions.