Fence Stain & Sealant Calculator
Figure out exactly how much stain or sealer to buy for your wood fence before you head to the store. Enter your fence’s length and height, pick a product, and get gallons, cans, and cost in one pass.
Prefilled from the selected product — adjust to match your can label or surface porosity.
Covers spills, absorption, and touch-ups. 10–15% is normal.
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Application tips
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Coverage & coats
Product profile
Fence stain coverage works off square footage, not linear feet. Multiply the fence length by its height to get the surface area of one side, then multiply by the number of coats you’re applying and add a waste percentage for absorption and spillage. Divide that total by the coverage rate printed on the can (in square feet per gallon) to get the gallons you need, then round up to whole cans.
Stain & Sealer Coverage by Product Type
Coverage rates vary a lot between solid color, semi-transparent, and clear sealers because pigment load changes how far a gallon spreads.
| Product Type | Coverage per Gallon | Best For |
|---|---|---|
| Solid color stain | 200 sq ft | Maximum color, hides grain and old stain |
| Semi-transparent stain | 250 sq ft | Natural wood look with UV tint |
| Clear water sealer | 300 sq ft | Moisture protection only, no color |
How to Calculate Fence Stain Gallons
- Measure the total length of fence you’re staining, in linear feet.
- Measure the fence height, from the ground to the top of the pickets or rails.
- Multiply length by height to get square footage of one side.
- Multiply by the number of coats and add your waste percentage for absorption.
- Divide by the coverage rate for your chosen product to get gallons, then round up to full cans.
Worked example
Here’s how a 150 ft fence at 6 ft tall works out with 2 coats of solid color stain:
- Fence size150 ft long x 6 ft high
- Surface area900 sq ft
- Coats2
- ProductSolid color stain (200 sq ft/gal)
- Waste factor5%
- Total gallons needed9.45 gal
- Cans to buy10 (1-gal cans)
- Estimated cost$350 (10 x $35)
Do You Need to Stain Both Sides?
This calculator figures coverage for one face of the fence. If both sides need a finished look, or the fence isn’t shared with a neighbor, double your area before you calculate gallons — a 150 ft fence stained on both sides is really 1,800 sq ft of surface, not 900. Privacy and shadowbox-style fences also have more surface area per linear foot than a standard picket fence because the boards overlap, so bump your waste percentage up to 10-15% on those styles to cover the extra square footage hiding in the overlaps.
Sprayed application uses more product than brushing or rolling, typically 20-30% more, because of overspray and drift. If you’re spraying, increase your waste factor accordingly rather than relying on the standard 5%.
Common mistakes
- Only counting one sidewhen both faces need stain, which cuts your real coverage need in half.
- Skipping the waste factoron rough-sawn or new pressure-treated wood, which soaks up far more stain than the can’s coverage rating assumes.
- Ignoring the coats needed for solid colorsolid stains usually need two coats for even coverage and full UV protection, while semi-transparent often needs just one.
- Buying by linear foot instead of areaa taller fence needs proportionally more stain per linear foot than a short one.
What this calculator assumes
Adjust your result if your project differs from these.
- Coverage rate is for one face of the fence only; double the area for both sides
- Coverage figures assume smooth, previously stained or sealed wood; new or rough-sawn lumber absorbs more
- Waste percentage covers minor spillage and touch-ups, not spray application overspray
- Can sizes are 1-gallon; the calculator rounds up to whole cans
- Assumes a standard picket or board fence, not lattice or shadowbox styles with extra surface area
Common questions
Do I need to stain both sides of my fence?
Only if both sides will be visible or exposed to weather. This calculator covers one side by default, so double your area if you’re doing both faces.
How many coats does fence stain need?
Solid color stains typically need two coats for full coverage and UV protection. Semi-transparent stains and clear sealers often only need one, though a second coat extends the life of the finish.
Solid, semi-transparent, or clear sealer, which should I choose?
Solid color hides the wood grain and covers old stain but needs recoating less often. Semi-transparent lets the grain show through with some color. Clear sealer adds no color, just moisture protection, and typically needs reapplying every year.
How long does fence stain last before recoating?
Semi-transparent and solid stains generally last 2-4 years depending on sun exposure and climate. South- and west-facing sections weather faster and may need touch-ups sooner.
Does the waste percentage cover spray application?
No, the default 5% waste covers normal spillage and brush loss. Spraying typically uses 20-30% more product, so increase the waste factor if you’re using a sprayer.
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Fence Stain & Sealant Calculator Estimate
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materialcalculate.com/tools/fence-stain-sealant-calculator/
Project
| Shape | — |
| Dimensions | — |
| Area | — |
| Product | — |
| Coverage | — |
| Coats | — |
| Overage allowance | — |
Shopping list
| Total product | — |
| Cans needed | — |
| Estimated total cost | — |
Notes
Estimate generated by materialcalculate.com. Confirm quantities and coverage with your product label before ordering.