5.x common.inc parse_size($size)
6.x common.inc parse_size($size)
7.x common.inc parse_size($size)

Parses a given byte count.


$size: A size expressed as a number of bytes with optional SI or IEC binary unit prefix (e.g. 2, 3K, 5MB, 10G, 6GiB, 8 bytes, 9mbytes).

Return value

An integer representation of the size in bytes.

Related topics

6 calls to parse_size()
color_scheme_form_submit in modules/color/color.module
Form submission handler for color_scheme_form().
CommonSizeTestCase::testCommonParseSize in modules/simpletest/tests/common.test
Check that parse_size() returns the proper byte sizes.
CommonSizeTestCase::testCommonParseSizeFormatSize in modules/simpletest/tests/common.test
Cross-test parse_size() and format_size().
drupal_check_memory_limit in includes/bootstrap.inc
Compares the memory required for an operation to the available memory.
file_field_widget_upload_validators in modules/file/file.field.inc
Retrieves the upload validators for a file field.

... See full list


includes/common.inc, line 1896
Common functions that many Drupal modules will need to reference.


function parse_size($size) {
  $unit = preg_replace('/[^bkmgtpezy]/i', '', $size);

  // Remove the non-unit characters from the size.
  $size = preg_replace('/[^0-9\\.]/', '', $size);

  // Remove the non-numeric characters from the size.
  if ($unit) {

    // Find the position of the unit in the ordered string which is the power of magnitude to multiply a kilobyte by.
    return round($size * pow(DRUPAL_KILOBYTE, stripos('bkmgtpezy', $unit[0])));
  else {
    return round($size);


rudiedirkx’s picture

The 'opposite' of this function is format_size(), which "generates a string representation for the given byte count".

izus’s picture

Drupal 8 equivalent :