How it works
Each octal digit represents read=4, write=2, execute/search=1. Decode the three permission groups.
Input definitions
- Three-digit octal permissions
- Enter the value in the labeled unit.
A worked example
- Three-digit octal permissions
- 755
Assumptions & limits
Three ordinary Unix mode digits only; excludes setuid, setgid and sticky bits, umask and ACL evaluation.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-17. Content checked against the stated method and examples. Our verification approach.
Common questions
Does this tool execute the code or data I paste?
Inputs are treated as data under the stated parser or transformation. Output is displayed as text. Parsing or formatting does not establish that the content is safe to execute elsewhere.
How does the chmod numeric permission calculator tool work?
Each octal digit represents read=4, write=2, execute/search=1. Decode the three permission groups.
What are the assumptions and limits of chmod numeric permission calculator?
Three ordinary Unix mode digits only; excludes setuid, setgid and sticky bits, umask and ACL evaluation.