Stair rail material takeoff

Stair Railing Calculator

Estimate a stair railing run from total rise, total run, rail extensions, post spacing, baluster width, maximum opening, waste, and material costs.

Units

Total stair rise (ft)Total stair run (ft)Matching rail runs Total rail extension (ft)Post spacing (ft)Rail stock length (ft)Baluster width (in)Maximum clear opening (in)Waste / extras (%)Rail cost per length ($/ft)Cost per post ($)Cost per baluster ($)

Handrail length

Posts and rail sticks

Balusters to buy

Rough cost

Stair railings need code and product checks

This is a material estimate only. Guard height, handrail graspability, stair geometry, baluster openings, post attachment, wall returns, landing rails, local code, and manufacturer instructions must be checked before installing.

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Stair Handrail Angle Calculator

Check the rail angle and diagonal length before ordering rail stock.

Stair Baluster Spacing Calculator

Lay out exact spindle spacing along the sloped stair rail.

Stair Stringer Calculator

Set the stair rise, run, and step count before rail layout.

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Stair railing formula

Sloped rail length = sqrt(total rise² + total run²)

Handrail length = sloped length + rail extensions

Posts per run = ceiling(handrail length ÷ post spacing) + 1

Balusters per run = ceiling((sloped length - max opening) ÷ (baluster width + max opening))

Sample takeoff

A stair with 4 ft rise, 6 ft run, 1 ft total rail extension, 5 ft post spacing, 1.5 in balusters, and a 4 in max opening needs about 8.2 ft of handrail, 3 posts, and 18 balusters with 10% waste.A stair with 1.2 m rise, 1.8 m run, 0.3 m total rail extension, 1.5 m post spacing, 38 mm balusters, and a 100 mm max opening needs about 2.5 m of handrail, 3 posts, and 17 balusters with 10% waste.

Stair Railing Calculator FAQ

How do I calculate stair railing length?+

Use the Pythagorean theorem on total rise and total run to get the sloped rail length, then add any top and bottom extensions required by the design or code.Use the Pythagorean theorem on total rise and total run to get the sloped rail length, then add any top and bottom extensions required by the design or code.

Does this calculate code-compliant stair railing?+

No. It estimates materials after you enter assumptions. Handrail height, returns, graspable profile, guard openings, posts, and local code must be verified.No. It estimates materials after you enter assumptions. Handrail height, returns, graspable profile, guard openings, posts, and local code must be verified.

Can this estimate stair balusters too?+

Yes. It uses the sloped rail length, baluster width, maximum opening, rail runs, and waste to estimate a buy count.Yes. It uses the sloped rail length, baluster width, maximum opening, rail runs, and waste to estimate a buy count.