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Baluster Calculator

How MANY BALUSTERS ARE NEEDED FOR MY RAILING? 

Man Installing Wood Balusters on Wood Railing

Use ProWood's baluster calculator to quickly determine how many balusters or spindles you need for your railing.


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Balusters are the vertical guards that support the handrail. They must be installed close enough that the space between them is no greater than 4". Most city inspectors carry a 4" ball with them to test the spacing. Installed balusters should withstand 50 lbs. of pressure exerted over a 1-sq. ft. area.

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Total number of balusters needed

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