Wood Finish Calculator
Precise finish estimates for flawless woodworking results
Safety Note: Always work in a well-ventilated area when applying finishes. Wear appropriate PPE (gloves, respirator) and follow manufacturer's safety instructions.
Project Dimensions
Wood Properties
Finish Specifications
Finish Estimate
Total Surface Area:
Adjusted Coverage:
Finish Required:
12.0 sq ft
10.8 sq ft/gal
0.22 gallons
Recommendations:
- Consider buying 1 quart for this project
- Oak typically requires pre-conditioner for even stain
Wood Finish Application Guide
Key Factors Affecting Coverage
- Wood Porosity: Open-grained woods (oak, mahogany) absorb more finish
- Surface Preparation: Rough surfaces require up to 30% more finish
- Application Method: Spraying is most efficient, wiping uses more product
- Finish Viscosity: Thinner finishes penetrate deeper but may require more coats
Common Finish Types
Penetrating Oils
Danish oil, tung oil, linseed oil
300-400 sq ft/gal, 2-3 coats
Surface Finishes
Polyurethane, lacquer, varnish
450-600 sq ft/gal, 2 coats
Frequently Asked Questions
Why does my wood type affect how much finish I need?
Different woods have varying porosity. Open-grained woods like oak have large pores that absorb more finish, while dense woods like maple absorb less. The calculator accounts for these differences with wood-specific absorption factors.
Should I round up when purchasing finish?
Yes, always round up to the nearest available container size. Having extra ensures color consistency for touch-ups and accounts for unexpected needs. Unopened containers can often be returned.
How does application method affect coverage?
Spraying typically provides the most efficient coverage but requires proper equipment. Brushing uses about 10% more product, while wiping/rag application can use 20-30% more due to product remaining in the applicator.