How to Count Blocks in AutoCAD Quickly and Easily

To count blocks in AutoCAD, use the DATAEXTRACTION command to create a table listing all block references and their counts. Alternatively, use the FILTER command with SELECTSIMILAR or write a simple AutoLISP script to count block instances.

Syntax

The main command to count blocks is DATAEXTRACTION. It guides you through creating a data extraction table that lists blocks and their counts.

Another approach is using FILTER to select block references by name, then SELECTSIMILAR to select all instances.

For scripting, AutoLISP can be used with functions like (ssget "X" (list (cons 0 "INSERT"))) to select all block inserts.

autolisp

DATAEXTRACTION
FILTER
SELECTSIMILAR

; AutoLISP example to count blocks named "MyBlock"
(setq ss (ssget "X" '((0 . "INSERT") (2 . "MyBlock"))))
(setq count (if ss (sslength ss) 0))
(princ (strcat "Count of MyBlock: " (itoa count)))

Example

This AutoLISP example counts all instances of a block named "Door" in the current drawing and prints the count in the command line.

autolisp

(defun c:CountDoorBlocks ()
  (setq ss (ssget "X" '((0 . "INSERT") (2 . "Door"))))
  (setq count (if ss (sslength ss) 0))
  (princ (strcat "Number of 'Door' blocks: " (itoa count)))
  (princ)
)

; Run by typing CountDoorBlocks in the command line

Output

Number of 'Door' blocks: 15

Common Pitfalls

• Not specifying the correct block name causes zero count results.
• Using SELECTSIMILAR without filtering by block name may select unwanted objects.
• Blocks nested inside other blocks require recursive counting or exploding blocks first.
• Data extraction tables may include unwanted attributes if filters are not set properly.

autolisp

; Wrong way: counting without block name filter
(setq ss (ssget "X" '((0 . "INSERT")))) ; selects all blocks
(setq count (if ss (sslength ss) 0))
(princ (strcat "Count: " (itoa count)))

; Right way: filter by block name
(setq ss (ssget "X" '((0 . "INSERT") (2 . "Window"))))
(setq count (if ss (sslength ss) 0))
(princ (strcat "Count of Window blocks: " (itoa count)))

Quick Reference

• DATAEXTRACTION: Use for detailed block count tables.
• FILTER + SELECTSIMILAR: Quick manual selection of blocks.
• AutoLISP scripts: Automate counting by block name.
• Remember: Block names are case-sensitive.

Key Takeaways

Use the DATAEXTRACTION command for an easy block count table.

AutoLISP scripts can automate counting blocks by name.

Always filter by exact block name to avoid incorrect counts.

Nested blocks require special handling to count accurately.

Use FILTER and SELECTSIMILAR for quick manual block selection.