Deck Spindle Calculator

Use the calculator to figure out how many balusters or spindles you'll need for a section of deck railing. We broke it down to 4, 6, and 8 feet sections. Example: My railing section in between the deck post is 6 feet. I'm using 2 X 3 spindles so I need 12 spindles.


This calculator also works for balusters.

Gap Length

Railing Length

Spindle/Baluster Dimensions

Measurements are in inches.

What is the code for deck spindle spacing?

Balusters and spindles, the vertical guards that support the handrail, must be 4 inches or less apart. Most city inspectors carry a 4-inch ball with them to test spacing.