width

type: double, default: 0.75, minimum: 0.01

This is taken as the initial, minimum width of the node. If fixedsize is true, this will be the final width of the node. Otherwise, if the node label requires more width to fit, the node's width will be increased to contain the label.

If the output format is dot, the value given to width will be the final value.

If the node shape is regular, the width and height are made identical:

• If either the width or the height is set explicitly, that value is used.
• If both the width or the height are set explicitly, the maximum of the two values is used.
• If neither is set explicitly, the minimum of the two default values is used.

digraph {
  "d" # default
  "1in" [width=1]
  "2in" [width=2]
}

• Nodes

Search the Graphviz codebase for "width"