WoodCalcs.uk
Wood Stain Calculator — Coverage Estimator
Calculate how much wood stain you need based on surface area, number of coats, and wood porosity.
How We Calculate This
Total area = Surface area × Number of coats
Litres needed = Total area ÷ Coverage rate
Coverage rates vary: 12-16 m²/L for smooth timber, 8-10 m²/L for rough or very porous wood. Always check the product data sheet.
Frequently Asked Questions
Most wood stains cover 12-16 m² per litre for the first coat on smooth timber. Rough or porous wood absorbs more and may only get 8-10 m² per litre. Always check the manufacturer data sheet.
One coat gives a lighter colour; two coats are standard for most projects. Three coats can be used for very dark finishes. Always let each coat dry fully before applying the next.
Yes. Softwoods like pine absorb more stain, reducing coverage. Hardwoods like oak absorb less. End grain absorbs much more than face grain, so seal end grain first or pre-condition with a wood conditioner.
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Last updated: February 2026
All calculations are estimates. Always verify measurements and material quantities before cutting or purchasing.