Varnish Calculator
Estimate varnish from surface area, number of coats and the product’s stated coverage rate.
Results
Surface area
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Area including coats
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Finish required
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Product coverage can vary substantially by wood species, surface preparation, application method and product formulation; use the label value when available.
How it works
The calculator multiplies the surface area by the number of coats and divides by the product coverage rate.
finish = surface area × coats ÷ coverage rateWorked example
An 18 ft² surface with three coats at 400 ft²/gal requires about 0.135 US gal, or roughly 17.3 US fl oz.
Assumptions
- The entered coverage rate is for one coat and is expressed per unit of liquid finish.
Limitations
- Absorption, sanding, end grain, application losses and product instructions can change actual usage.