Fence and rail picket spacing estimator

Picket Spacing Calculator

Estimate pickets per section, equal gap size, total pickets, waste, and rough material cost from opening length, picket width, maximum gap, and section count. Useful for fence runs, porch rails, and deck picket layouts.

Units

Opening length (in)Picket width (in)Maximum gap (in)Similar sections Waste / extras (%)Cost per picket ($)

Pickets to buy

Equal gap

Per section

Rough cost

Picket spacing is layout math

This calculator places pickets evenly inside a measured opening. It does not approve guardrail code, fence height, post spacing, wind loads, fasteners, or local rules. For guardrails, verify the required maximum opening before building.

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Baluster Calculator

Use for stair and guardrail baluster spacing checks.

Deck Railing Post Spacing

Lay out the posts before picket or baluster spacing.

Fence Material Calculator

Estimate posts, rails, pickets, panels, and concrete bags.

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Picket spacing formula

Pickets per section = ceiling((opening - max gap) ÷ (picket width + max gap))

Equal gap = (opening - pickets × picket width) ÷ (pickets + 1)

Total pickets = pickets per section × sections × (1 + waste %)

Sample takeoff

A 96 in opening with 1.5 in pickets and a 4 in max gap needs 17 pickets per section, leaving about 3.53 in equal gaps. Ten sections with 8% waste need about 184 pickets.A 2400 mm opening with 38 mm pickets and a 100 mm max gap needs 17 pickets per section, leaving about 97 mm equal gaps. Ten sections with 8% waste need about 184 pickets.

Picket Spacing Calculator FAQ

Is picket spacing different from baluster spacing?+

The math is similar, but the intent is different. Picket spacing usually means fence or rail pickets inside repeated sections; baluster spacing often focuses on stair or deck guard code.The math is similar, but the intent is different. Picket spacing usually means fence or rail pickets inside repeated sections; baluster spacing often focuses on stair or deck guard code.

How do I keep every gap under 4 inches?+

Enter 4 inches as the maximum gap. VibeCalc rounds the picket count up, then shows the equal gap that stays at or below that limit.Enter 4 inches as the maximum gap. VibeCalc rounds the picket count up, then shows the equal gap that stays at or below that limit.

Does this account for posts?+

No. Measure the clear opening between posts or rails, then enter that opening length. Use the fence material or deck railing post calculator for post layout.No. Measure the clear opening between posts or rails, then enter that opening length. Use the fence material or deck railing post calculator for post layout.