The EMRATIO is computed as the "Civilian employment" divided by "Civilian non-institutional population." In September 2012, these were (in thousands) 142,974 and 243,772 respectively, resulting in a ratio of 58.7%.

• Civilian employment (FRED Data series CE 160V): Includes those employed 16+ years of age but excludes those unemployed or outside the workforce.
• Civilian non-institutional population (FRED Data series CNP 160V): Civilian noninstitutional population is defined as persons 16 years of age and older residing in the 50 states and the District of Columbia, who are not inmates of institutions (e.g., penal and mental facilities, homes for the aged), and who are not on active duty in the Armed Forces.

The total U.S. population was approximately 315 million during 2012.

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