**Ratio codification** is the formal expression of a flag’s hoist-to-fly proportions in law or regulation. National practice varies: some states fix only the ratio and leave details to manufacturers, while others publish a complete construction sheet. Codified ratios range from 1:1 (Switzerland, Vatican) through the common 2:3 to the unusually elongated 1:2 of the United Kingdom and 10:19 of the United States.
**Example**: The codified ratio of the flag of the United States is fixed as 10:19 by Executive Order 10834 of 1959.
**See also**: [ratio](/glossary/ratio/), [proportions](/glossary/proportions/), [construction-sheet](/glossary/construction-sheet/), [hoist](/glossary/hoist/)