Fence Stain Calculator
How much fence stain do I need? This free fence stain calculator answers it from your fence's length, height, and style — privacy, board-on-board, or picket with gaps — on one or both sides, using real manufacturer coverage rates (Behr, Thompson's WaterSeal). It works as a fence stain estimator you can trust for planning: coverage, post & rail adder, 1 vs 2 coats, cost, and drying time. If you typed "how to calculate fence stain" into Google, start with the Coverage tab — this fence stain coverage calculator handles the whole job.
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Fence Stain Coverage Estimator
Enter your fence size to get gallons. Whether you are asking "how many gallons of stain for a fence" or "how much stain for a wood fence" of any length, this wood fence stain coverage estimator uses manufacturer coverage per gallon: transparent 325 sq ft/gal first coat / 650 second, semi-transparent 300, solid 300 first / 600 second, clear sealer 275 (midpoint of the 150–400 label range).
Post & rail adder
Coverage rates used (manufacturer anchors)
| Product | Coverage per gallon | Typical coats |
|---|---|---|
| Transparent stain (Behr TDS) | 325 sq ft/gal 1st coat, 650 2nd | 2 (required) |
| Semi-transparent (Behr) | 300 sq ft/gal | 2 (required) |
| Solid stain (Behr) | 300 sq ft/gal 1st coat, 600 2nd | 2 (recommended) |
| Clear sealer (Thompson's label) | 150–400 sq ft/gal (plans on 275) | 1 |
Style factors (board-on-board ×1.15, picket gap fraction), wood-condition and waste factors are planning guidance, not manufacturer data. Full sources in the FAQ.
One Coat vs Two Coats of Fence Stain
Comparing one coat vs two coats fence stain? Behr requires 2 coats for semi-transparent and 2 thin coats for transparent, and recommends 2 for solid (the second coat covers roughly twice as far). Thompson's transparent stain is made for 1 coat in most scenarios. This comparison uses your Coverage tab inputs.
Fence Staining Cost Calculator
How much does it cost to stain a fence? This fence staining cost calculator adds stain plus prep materials. Prices are estimates — adjust to your local store.
Fence Stain Drying Time Planner
How long does fence stain take to dry? It depends on temperature and humidity. Enter your conditions for dry-to-touch, recoat, rain-safe, and cure windows. Guidance only — always follow your product label.
Related tools
This tool stains vertical fence runs (privacy, board-on-board / shadowbox, picket with gaps) on one or both sides, plus posts and rails. Staining a deck? Use our deck stain calculator (deck floor plus railing linear feet and stairs — a different geometry). Sizing a new fence (post count, picket count, gates)? Use the fence calculator.
Fence Stain Calculator FAQs
How much fence stain do I need for a 150 ft privacy fence?
For a 150 ft fence that is 6 ft tall — answering “how much stain for a 6 foot privacy fence” — stained on both sides (150 × 6 × 2 = 1,800 sq ft), this fence stain calculator estimates 17.6 gallons of semi-transparent stain (2 coats on weathered wood, 10% waste), so buy 18 whole gallons. The math: 1,800 ÷ 300 sq ft per gallon × 2 coats × 1.33 (weathered wood absorbs more) × 1.10 (waste) ≈ 17.6 gal. The same formula answers “how much fence stain do i need” at any size — just change the dimensions.
How many gallons of stain for a 100 foot fence?
A 100 foot fence, 6 ft tall, stained both sides is 1,200 sq ft. With semi-transparent stain (300 sq ft/gal), 2 coats, new smooth wood, and 10% waste: 1,200 ÷ 300 × 2 × 1.10 ≈ 8.8 gallons — buy 9 gallons. So the short answer to “how much stain for a 100 foot fence” is about 8.8 gallons, or 9 one-gallon cans.
How do gaps change the fence stain calculation?
A “fence picket stain calculator” must handle the gaps between boards. With 5.5″ pickets and 0.5″ gaps, the stained face fraction is 5.5 ÷ (5.5 + 0.5) ≈ 0.92: a 100 ft × 6 ft fence on both sides has 1,200 sq ft of face but only 1100.0 sq ft of picket surface to stain. A board on board fence stain calculator lands higher instead — the overlapping boards add about 15%, giving 1380.0 sq ft. For shadowbox fence stain calculator use, treat it like board-on-board (both faces overlap). At 1 coat of semi-transparent on new wood with 10% waste, the gapped picket fence needs 4.03 gallons — buy 5. Enter your own picket width and gap in the Coverage tab.
Should I apply one coat or two coats of fence stain?
It depends on the product. Behr requires 2 coats for its semi-transparent stain and 2 thin coats for transparent, and recommends 2 for solid (the second coat covers roughly twice as far). Thompson’s WaterSeal transparent stain is designed for 1 coat in most scenarios. For a 150 ft × 6 ft privacy fence (1,800 sq ft, both sides) with semi-transparent stain on weathered wood: 1 coat needs 8.8 gal (buy 9), 2 coats need 17.6 gal (buy 18). When in doubt, follow your can’s label — this one coat vs two coats fence stain comparison is a planning estimate.
How much extra stain do posts and rails need?
A fence post stain calculator usually underestimates them — posts have four faces. As a planning rule this tool stains each post on all four sides using its actual lumber dimension (a 4×4 is really 3.5″), plus the post cap top, and rails on both faces. Example: 26 posts (4×4, 6 ft exposed) add 182.0 sq ft, post caps add 2.2 sq ft, and 300 linear feet of 2×4 rails (both faces) add 175.0 sq ft — 359.2 sq ft beyond the fence face. That is why “how much stain for fence posts and rails” is always answered separately from the face area. Use the Post & rail adder in the Coverage tab for your own counts.
What is the coverage per gallon of fence stain?
Manufacturer label rates behind this fence stain coverage per gallon table: transparent fence stain coverage ≈ 325 sq ft/gal on the first coat and 650 on the second (midpoints of the Behr TDS ranges 300–350 and 600–700); semi transparent fence stain coverage ≈ 300 sq ft/gal (Behr Premium Semi-Transparent, 2 coats required); solid fence stain coverage ≈ 300 sq ft/gal on the first coat and 600 on the second (Behr Premium Solid); fence sealer coverage per gallon ≈ 150–400 sq ft/gal on the Thompson’s WaterSeal label — this calculator plans on the 275 midpoint. Rough or weathered wood can cut these figures by about 25%.
How much does it cost to stain a fence?
For that same 150 ft fence: 17.6 gallons × $45/gal ≈ $792.0 of stain, plus about $72.0 of fence cleaner (6 containers), $84.0 of brightener (6 containers), and $25.0 of brushes/roller — an estimated total of $973.0, roughly $0.54 per square foot. This fence staining cost calculator uses $45/gal as a mid-range estimate (retail runs about $40–$50/gal); adjust the price to your local store for your fence stain cost per square foot.
How long does fence stain take to dry?
At 70°F and 50% humidity, semi-transparent stain is typically dry to the touch in 2.5 hours, ready to recoat in 2.5 hours, safe from rain after 5.0 hours, and fully cured after 30.0 hours. Cool and damp weather stretches that: at 55°F and 75% humidity the same stain needs 4.5 hours to touch, 4.5 to recoat, and 9.0 before rain, with 54.0 hours to full cure. So “how long does fence stain take to dry” really means “what are the temperature and humidity” — check the fence stain drying time in the Drying tab before you start.
Can you stain a chain link fence?
Can you stain a chain link fence? No — chain link is galvanized steel, not wood, so wood stain has nothing to soak into and the coverage math does not apply. This fence stain calculator shows a note instead of a number for chain link. For steel, use a rust-resistant metal paint. If you are staining a pressure treated fence stain calculator scenario instead (wood posts and rails on a chain-link line), estimate those wood parts with the Post & rail adder. One bonus fact: Thompson’s solid stain is guaranteed 15 years on fences versus 6 years on decks — vertical wood weathers slower.
How much extra stain should I buy for waste?
Add 10% as a standard stain waste factor rule — it covers what stays in the sprayer, brush, and can. Bump it to 15% for rough or weathered wood, or if you are spraying (overspray losses). On a 150 ft fence at 2 coats, 10% waste is the difference between 16.0 and 17.6 gallons — in other words, nearly two extra gallons.
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