Wood Finishing Calculators

Calculate coverage for stain, polyurethane, paint, oil, and lacquer, plus recoat and drying times - know how much finish you need before you open a can.

Finish Drying Time CalculatorFinish Drying Time Calculator that scales the label recoat, light use and full cure times of poly, oil and stain…Floor Waxing CalculatorFloor Waxing Calculator that works out floor finish gallons, stripper at your dilution and crew labor hours for a strip…Lacquer CalculatorLacquer Calculator that finds the gallons or cans to buy, the thinner to add and the overspray lost, then checks…Oil Finish CalculatorOil Finish Calculator that splits thinned tung oil into oil and solvent, fits Osmo coverage to the applicator and lists…Paint Coverage CalculatorPaint Coverage Calculator that lists openings, edges of doors, primer and the least costly mix of cans, with the coverage…Sanding Schedule CalculatorSanding Schedule Calculator lists grit steps for your finish, then totals sanding time, scuff passes, and discs from area, pad…Shellac CalculatorShellac Calculator finds the flakes and alcohol for a pound cut, the shellac a piece will take from its area…Varnish Coverage CalculatorVarnish Coverage Calculator that sizes a poly or spar varnish job in quarts or gallons, built on the spread rate…Wood Filler CalculatorWood Filler Calculator that turns the size of each hole, crack or dent into fluid ounces of filler, the tub…Wood Stain CalculatorWood Stain Calculator that sizes a deck, fence or furniture job coat by coat, using the spread rate on each…

Wood Finishing Coverage Calculators

Buy too little finish and the can runs dry mid-coat, leaving lap marks where the new batch meets the old. Buy too much and it skins over in the tin before the next project. These calculators size the finish to the job, so you buy the right amount once.

How finish coverage works

Coverage starts with surface area, but wood makes it more than length times width. A gallon of penetrating stain covers roughly 500 to 600 square feet on smooth hardwood. Softwood and rough stock drink more, so the same gallon covers less. The first coat soaks into raw grain. Later coats sit on partly sealed pores and go further. Our calculators fold in porosity and coat count, so the estimate matches the wood you're finishing, not a flat average.

Stain, poly, paint, and oil

Each finish behaves differently, so each gets its own tool. Work out stain by area, species, and coats. Size polyurethane and lacquer for film-building topcoats. Estimate paint for cabinets and trim, primer included. Figure oil quantities for Danish, tung, and linseed finishes that soak in rather than build up. The result comes back in real container sizes - pints, quarts, gallons - so you know exactly what to buy.

Drying and recoat times

Coverage is half the job. Recoat too soon and the finish stays soft or wrinkles; wait too long and you may need to scuff-sand for the next coat to grip. Drying and cure times shift with the finish type, temperature, humidity, and airflow. The timing tools here give you a working window for each finish, so the coats build cleanly.

Coverage rates vary by brand and formula, so treat these as planning estimates - always check the figure printed on your product and add a small margin for rag soak, end grain, and test pieces.