WOLFRAM

Wolfram Language & System Documentation Center

FileSize[file]

gives the size of a file as a quantity.

Details
Details and Options Details and Options
Examples  
Basic Examples  
Scope  
Generalizations & Extensions  
Applications  
Properties & Relations  
See Also
Related Guides
Related Workflows
History
Cite this Page

FileSize

FileSize[file]

gives the size of a file as a quantity.

Details

  • FileSize returns a Quantity object.
  • FileSize uses units of bytes, kilobytes, megabytes, etc. to give a conveniently readable representation of the file size.
  • The file in FileSize can be specified by giving the path to the file as a string or a File object.
  • FileSize also works with cloud objects.

Examples

open all close all

Basic Examples  (1)

Get the size of a file:

Wolfram Language code: FileSize[FindFile["ExampleData/ocelot.jpg"]]

Scope  (2)

Get the file size for a File object:

Wolfram Language code: FileSize[FindFile["ExampleData/GSM263810.txt"]]

Find the size of a CloudObject:

Wolfram Language code: obj = CloudPut[10!, CloudObject[]]
Wolfram Language code: FileSize[obj]

Generalizations & Extensions  (1)

FileSize uses SI prefix values for file size, where a megabyte is 106 bytes:

Wolfram Language code: size = FileSize[File[FindFile["ExampleData/GSM263810.txt"]]]
Wolfram Language code: UnitConvert[size, "Kilobytes"]

The resulting Quantity can be converted to other units using UnitConvert:

Wolfram Language code: UnitConvert[size, "Kibibytes"]

Applications  (1)

Use FileSize with FileSystemMap to inspect the size of various files in a directory:

Wolfram Language code: FileSystemMap[FileSize, $InstallationDirectory <> "/Documentation/English/System/ExampleData", FileNameForms -> "*.gz"]

Properties & Relations  (1)

FileSize gives the same number of bytes as FileByteCount:

Wolfram Language code: FileByteCount[FindFile["ExampleData/ocelot.jpg"]]
Wolfram Language code: FileSize[FindFile["ExampleData/ocelot.jpg"]]
Wolfram Research (2017), FileSize, Wolfram Language function, https://reference.wolfram.com/language/ref/FileSize.html.

Text

Wolfram Research (2017), FileSize, Wolfram Language function, https://reference.wolfram.com/language/ref/FileSize.html.

CMS

Wolfram Language. 2017. "FileSize." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/FileSize.html.

APA

Wolfram Language. (2017). FileSize. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/FileSize.html

BibTeX

@misc{reference.wolfram_2026_filesize, author="Wolfram Research", title="{FileSize}", year="2017", howpublished="\url{https://reference.wolfram.com/language/ref/FileSize.html}", note=[Accessed: 12-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_filesize, organization={Wolfram Research}, title={FileSize}, year={2017}, url={https://reference.wolfram.com/language/ref/FileSize.html}, note=[Accessed: 12-June-2026]}