Baluster Span for 4" (10.16cm) Ball Rule
4 @ 2
Feet (60.96cm)
9 @ 5 Feet
(1.524 meters)
11 @ 6 Feet
(1.8288 meters)
14 @ 8 Feet
(2.4384 meters)
16 @ 9 Feet
(2.7432 meters)
18 @ 10 Feet
(3.048 meters)
20 @ 11 Feet
(3.3528 meters)
22 @ 12 Feet
(3.6576 meters)