Fence Stain Calculator

Staining a fence is one of the highest-return maintenance tasks a homeowner can do — yet most people significantly underestimate material needs or choose the wrong product for their fence style.

Stain vs. Paint for Fences

Penetrating stain soaks into the wood fibers and lets the wood breathe, allowing moisture to naturally escape. This reduces cupping, warping, checking, and splitting. Paint forms a surface film that traps moisture inside the wood — when the trapped moisture eventually forces its way out, it lifts and peels the paint. For outdoor fences exposed to ground moisture and rain, penetrating stain is almost always the better choice. The only exception is a factory-primed composite or smooth-faced wood fence where you specifically want a painted appearance.

Application Strategy: Spray and Back-Brush

Vertical fence surfaces cause runs and drips if you apply stain too liberally. The fastest professional technique: use a pump sprayer to apply stain to both sides of the fence simultaneously (stain soaks through pickets), then immediately back-brush each face with a brush to work stain into the grain and clean up runs. This is 3–4× faster than brush-only application and gives better penetration.

Fence Material Compatibility

• Pressure-treated pine: Most common fencing material. Must dry 6+ months before staining. New PT wood is too wet and chemical-saturated to accept stain.
• Cedar / Redwood: Naturally rot-resistant oils can interfere with stain adhesion on new wood. Allow to weather 3–6 months OR use a cedar-specific stain.
• Rough-sawn boards: Absorb significantly more stain than smooth-planed boards — use the lower end of coverage range estimates.

Coverage by Fence Style

• Solid privacy fence: Full board faces on both sides. 5-foot fence = 10 sq ft per linear foot (both sides).
• Picket fence: Pickets have gaps between them. If pickets are 3.5" wide with 1.5" gaps, only 70% of the horizontal distance is actual wood (3.5 / 5.0 = 70%). Coverage = length × height × coverage_fraction × sides.
• Stockade fence: Similar to privacy, slightly more surface area from rough-cut tops.

Coverage Rate: 275 sq ft per gallon (general estimate for wood stain, one coat)

For weathered grey or rough-sawn wood, use 150–200 sq ft/gallon. For smooth well-maintained wood, up to 350 sq ft/gallon.

The Post Top Rule

Always cap or stain the end grain of fence posts. End grain absorbs 5–10× more moisture than face grain and rots first — this is the most common point of fence failure. Use a generous coat of stain or sealant on all post tops, even if you skip the rails and pickets.

Worked Example

A 100-foot solid privacy fence, 6 feet tall, both sides, 1 coat, 250 sq ft/gal coverage:

• Area = 100 × 6 × 2 = 1,200 sq ft
• Gallons = 1,200 / 250 = 4.8 → buy 5 gallons

Staining Frequency

Untreated fence in full sun degrades rapidly — reapply every 2–3 years. Shaded fences: 4–5 years. Signs it’s time: wood turns grey or silver, water no longer beads on the surface, the wood feels dry and sounds hollow when tapped.

Temperature and Weather Rules

Apply stain on a cool, overcast day. Above 90°F or in direct sun, stain dries before penetrating properly. Below 50°F, most stains won’t cure. Never apply before rain is forecast within 24 hours.