Wood Stain Quantity Calculator
Calculate how many quarts or gallons of wood stain you need for any project.
Select wood species and number of coats for an accurate estimate.
Wood stain is a penetrating finish. It soaks into the fibers rather than sitting on top the way paint does, so coverage depends almost entirely on how thirsty the wood is.
Quarts needed = (area × coat factor) ÷ coverage per quart
Coverage by species, for one wiped-on and wiped-off coat
| Wood | Grain | Coverage |
|---|---|---|
| Pine, fir | Open, very absorbent | 150 to 200 sq ft per quart |
| Oak, ash | Open but even | 225 to 275 sq ft per quart |
| Cherry, walnut | Moderately dense | 250 to 300 sq ft per quart |
| Maple, birch | Closed, dense | 275 to 325 sq ft per quart |
The calculator uses the middle of each range.
Brands differ more than species do, and that is the caveat worth reading. Minwax quotes around 112 sq ft per quart for its oil stain, Varathane around 275, and General Finishes around 300. That is nearly a three-to-one spread on the same job, because the manufacturers are assuming different amounts of flooding before the wipe-off. Read the tin. Treat the table above as the starting point for a normal wipe-on, wipe-off coat, and if your tin says something different, believe the tin.
Worked example. A pine bookcase with 120 sq ft of visible surface, one coat: 120 ÷ 175 = 0.69 quarts, and with the 10% waste allowance that is 0.75 quarts. Buy one quart. Ask for two coats and the figure becomes 120 × 1.77 ÷ 175 = 1.21 quarts, so you would need two.
Why the second coat is not double. Most people apply one coat, let it dwell a few minutes, then wipe off the excess. A second coat lands on wood that is already saturated, so it absorbs about 30% less and darkens the color only slightly. Worth it for depth on open-grained wood, usually pointless on maple. Test on a scrap of the same board first, from the same board if you can: two pieces of the same species can take stain differently.
Wiping off the excess is not optional. Penetrating stain wants a dwell of 5 to 15 minutes and then a thorough wipe. Leave it standing and it dries sticky and gummy, which is one of the harder finishing problems to fix. Set a timer and stay in the room.
Pine and other softwoods blotch badly without a pre-stain conditioner. Maple resists penetrating stain altogether and often wants a gel stain or a toner instead, which changes the coverage figures again.
Stain is colour, not protection. It needs a topcoat once it has dried, typically after 4 to 24 hours depending on the product and the weather. Work out that quantity separately with the finish coverage calculator.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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