What does this tool do?
Stain coverage varies with wood species, porosity and whether the deck has been stained before. This calculator uses a coverage figure, adds the number of coats and rounds up to whole gallons.
The Formula
Area = length × width; stain = area × coats ÷ coverage per gallonFrequently Asked Questions
How many coats does a deck need?
Two thin coats are typical for a new or stripped deck. Previously sealed timber may need only one refresh coat; always check the manufacturer coverage figure.
Can I apply stain in cold weather?
Most stains need temperatures above about 50°F (10°C) and dry wood. Cold or damp conditions slow curing and can leave a patchy finish.