Finishing & Coating Calculators
Calculate coverage for stains, varnishes, paints, oils, and other wood finishes. Plan sanding schedules and drying times.
Wood Stain Calculator
Calculate how much wood stain you need based on surface area and coats.
Varnish Coverage Calculator
Work out varnish quantities for floors, furniture, and woodwork.
Paint Coverage Calculator
Calculate paint quantities for wood surfaces including primer coats.
Oil Finish Calculator
Estimate oil quantities for Danish oil, tung oil, and linseed finishes.
Wax Coverage Calculator
Calculate wax quantities for furniture and wood surface finishing.
Shellac Calculator
Work out shellac flake and methylated spirit ratios for French polishing.
Lacquer Calculator
Calculate lacquer quantities and thinner ratios for spray finishing.
Wood Filler Calculator
Estimate wood filler quantities for grain filling and repairs.
Sanding Schedule Calculator
Plan grit progression and sandpaper quantities for wood preparation.
Finish Drying Time Calculator
Estimate drying and curing times based on finish type and conditions.
10 free calculators in Finishing & Coating
Wood Finishing Calculations
A good finish protects and enhances the beauty of your woodwork. Getting the quantities right avoids running out mid-project or wasting expensive finishing products. These calculators help you estimate exactly what you need.
Coverage rates vary significantly between finish types. Oil-based stains typically cover 12–16 m² per litre, while thick varnishes may only manage 10–12 m² per litre. Our wood stain calculator and varnish calculator account for surface porosity, number of coats, and product coverage rates.
French polishing with shellac requires precise ratios of shellac flakes to methylated spirit. A standard “2-pound cut” uses 2 pounds of shellac per gallon of solvent. Our shellac calculator converts these traditional ratios to metric measurements for UK woodworkers.
Proper surface preparation is essential for a quality finish. Our sanding schedule calculator plans the correct grit progression and estimates sandpaper quantities, ensuring you achieve the smoothest possible surface before applying your chosen finish.