<Li> Width of stripe: L = 0.0769 (A / 13, One thirteenth of the flag height) </Li> <P> These specifications are contained in an executive order which, strictly speaking, governs only flags made for or by the U.S. federal government . In practice, most U.S. national flags available for sale to the public have a different width - to - height ratio; common sizes are 2 × 3 ft. or 4 × 6 ft. (flag ratio 1.5), 2.5 × 4 ft. or 5 × 8 ft. (1.6), or 3 × 5 ft. or 6 × 10 ft. (1.667). Even flags flown over the U.S. Capitol for sale to the public through Representatives or Senators are provided in these sizes . Flags that are made to the prescribed 1.9 ratio are often referred to as "G - spec" (for "government specification") flags . </P> <P> The exact red, white, and blue colors to be used in the flag are specified with reference to the CAUS Standard Color Reference of America, 10th edition . Specifically, the colors are "White", "Old Glory Red", and "Old Glory Blue". The CIE coordinates for the colors of the 9th edition of the Standard Color Card were formally specified in JOSA in 1946 . These colors form the standard for cloth, and there is no perfect way to convert them to RGB for display on screen or CMYK for printing . The "relative" coordinates in the following table were found by scaling the luminous reflectance relative to the flag's "white". </P> <Table> Official colors <Tr> <Th> Name </Th> <Th_colspan="6"> Absolute </Th> <Th_colspan="12"> Relative </Th> </Tr> <Tr> <Th> </Th> <Th_colspan="3"> CIELAB D </Th> <Th_colspan="2"> Munsell </Th> <Th> </Th> <Th_colspan="3"> CIELAB D </Th> <Th_colspan="4"> sRGB </Th> <Th_colspan="4"> GRACoL 2006 </Th> </Tr> <Tr> <Th> L * </Th> <Th> a * </Th> <Th> b * </Th> <Th> </Th> <Th> V / C </Th> <Th> L * </Th> <Th> a * </Th> <Th> b * </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> 8 - bit hex </Th> <Th> </Th> <Th> </Th> <Th> Y </Th> <Th> </Th> </Tr> <Tr> <Td> White </Td> <Td> </Td> <Td> 88.7 </Td> <Td> − 0.2 </Td> <Td> 5.4 </Td> <Td> 2.5 Y </Td> <Td> 8.8 / 0.7 </Td> <Td> </Td> <Td> 100.0 </Td> <Td> 0.0 </Td> <Td> 0.0 </Td> <Td> 1.000 </Td> <Td> 1.000 </Td> <Td> 1.000 </Td> <Td> #FFFFFF </Td> <Td>. 000 </Td> <Td>. 000 </Td> <Td>. 000 </Td> <Td>. 000 </Td> </Tr> <Tr> <Td> Old Glory Red </Td> <Td> </Td> <Td> 33.9 </Td> <Td> 51.2 </Td> <Td> 24.7 </Td> <Td> 5.5 R </Td> <Td> 3.3 / 11.1 </Td> <Td> </Td> <Td> 39.9 </Td> <Td> 57.3 </Td> <Td> 28.7 </Td> <Td>. 698 </Td> <Td>. 132 </Td> <Td>. 203 </Td> <Td> #B22234 </Td> <Td>. 196 </Td> <Td> 1.000 </Td> <Td>. 757 </Td> <Td>. 118 </Td> </Tr> <Tr> <Td> Old Glory Blue </Td> <Td> </Td> <Td> 23.2 </Td> <Td> 13.1 </Td> <Td> − 26.4 </Td> <Td> 8.2 PB </Td> <Td> 2.3 / 6.1 </Td> <Td> </Td> <Td> 26.9 </Td> <Td> 11.5 </Td> <Td> − 30.3 </Td> <Td>. 234 </Td> <Td>. 233 </Td> <Td>. 430 </Td> <Td> #3C3B6E </Td> <Td>. 886 </Td> <Td>. 851 </Td> <Td>. 243 </Td> <Td>. 122 </Td> </Tr> </Table>

What kind of blue is in the american flag