Fence Stain Calculator

A fence stain calculator returns the gallons of stain or sealer a wood fence needs. Fence length times height gives one side's area, doubled when both faces are stained. That area times the number of coats, divided by coverage per gallon and rounded up, gives the gallons.

Last reviewed September 2026Method & sources Report an error

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Stain Needed

12 gal

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Fence stain / sealer12 gallons

Breakdown
Stain Needed	12 gal
Total Surface Area	1,200 sq ft
Total Coverage Needed (area × coats)	2,400 sq ft
Estimated Cost

How to Calculate Fence Stain

Fence length times height gives the surface area of one side. Staining both sides (common for a freestanding privacy fence not shared with a neighbor) doubles that area. Multiplying by the number of coats gives the total coverage needed. Dividing that by the product's coverage rate (commonly 100-300 sq ft per gallon per coat, same range as deck stain) gives the gallons needed, rounded up.

Example: 100 ft of fence, 6 ft tall, both sides, 2 coats

100 ft of fence, 6 ft tall, both sides, 2 coats, 200 sq ft/gal coverage: 1. Area per side: 100 × 6 = 600 sq ft 2. Total area (both sides): 600 × 2 = 1,200 sq ft 3. Total coverage needed: 1,200 × 2 coats = 2,400 sq ft 4. Gallons needed: 2,400 ÷ 200 = 12 gallons Staining only the outward-facing side instead (shared fence with a neighbor) would cut this to 6 gallons. That is half the product for the same fence.

Fence Stain: Compare Scenarios

Scenario	Stain Needed	Total Surface Area	Total Coverage Needed (area × coats)
Small (50 ft x 4 ft dog-run fence)	4 gal	400 sq ft	800 sq ft
Medium (100 ft x 6 ft backyard fence)	12 gal	1,200 sq ft	2,400 sq ft
Large (300 ft x 6 ft yard perimeter)	36 gal	3,600 sq ft	7,200 sq ft

What Is Fence Stain?

A fence stain calculator converts a fence's length, height, and number of sides being stained into the gallons of stain or sealer needed. The biggest difference from a deck stain calculation is the sides multiplier: a fence has two faces that may both need coverage, while a deck's surface is stained once from the top.

Fence Stain: Pros and Cons

Pros

Accounts for both sides of the fence, a factor that's easy to forget and can double the real material need compared to a single-side estimate
Uses the same adjustable coverage-rate approach as the Deck Stain calculator, since stain coverage varies by product and by how porous or weathered the wood is
Separates total area from total coverage needed, making it clear exactly why two coats or two-sided staining raises the gallon count

Cons

Doesn't measure fence height variation. A fence that steps down a slope in sections has a different average height per section, which should be estimated separately if the height varies a lot
Doesn't distinguish a solid privacy fence from a picket fence with gaps. A picket fence has less total solid surface area to cover per linear foot, so this calculator's area assumes essentially solid coverage
Doesn't account for post caps, trim, or gate hardware needing extra coverage, which can add a modest amount beyond the flat fence area calculated here

Fence Stain: What a Pro Checks

Stain both faces of a freestanding fence if both are exposed to weather. Staining only the outward-facing side leaves the unstained face unprotected.
Check your product label before assuming one coverage rate. Stain coverage commonly ranges from 100 to 300 sq ft per gallon, depending on the product and how porous or weathered the wood is.
A picket fence with gaps has less solid surface per linear foot than a solid privacy fence. Reduce the length input proportionally, or expect to use somewhat less product than a solid-fence estimate.

Frequently Asked Questions

Do I need to stain both sides of a fence?

If the fence is freestanding and both faces are exposed to weather, yes. Staining both sides roughly doubles the material needed but protects both faces equally. A fence shared with a neighbor, where only one side is accessible or visible from your property, is often stained on just that one side.

How much stain do I need for 100 feet of fence?

For a 6 ft tall fence stained on both sides with 2 coats at a typical 200 sq ft/gal coverage rate, about 12 gallons. Staining one side only cuts that to 6 gallons for the same fence.

How many coats of stain does a fence need?

Two coats is common for new or bare wood, giving fuller color and protection. A single coat is sometimes used for a lighter, more natural look or when refreshing a fence that's already been stained before.

Does a picket fence need less stain than a privacy fence?

Per linear foot, yes. A picket fence with gaps between boards has less total solid wood surface than a solid privacy fence of the same length and height. This calculator estimates area as if the fence were solid, so for a fence with significant gaps, reduce the length input proportionally or expect to use somewhat less than the estimate.

Is fence stain the same as deck stain?

Often the same product works for both, since both are exterior wood surfaces exposed to weather. Many stain and sealer products are labeled for fences, decks, and other outdoor wood in one can. Check your specific product's label for any application differences between vertical (fence) and horizontal (deck) surfaces.

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