Spindle Spacing Calculator

Inside railing distance (cm)

Spindle width (cm)

Maximum allowable spacing (cm)

Spacing option

Centered

Evenly-spaced

Both

Calculate slanted spacing (for stair base rail)

Riser rise (cm)

Effective tread run (cm)

Result

0spindles

Unit length (spindle + max space)0

Centered — end spacing0

Centered — between spindles0

Evenly-spaced — spacing0

To-scale layout

Based on the standard unit-length method for spindle layout. Many building codes cap spacing at 10 cm / 4 in to prevent a child's head from passing through — check your local code before finalizing dimensions.