Gallup tracks daily the employment status of the U.S. population and the workforce using a set of questions designed to measure U.S. employment accurately, in accordance with International Conference of Labour Statisticians standards. Based on an individual's responses to the question series (some of which are asked of only a subset of respondents), Gallup classifies respondents into one of six employment categories: employed full time for an employer; employed full time for self; employed part time, but do not want to work full time; employed part time, but want to work full time; unemployed; and out of the workforce.
Payroll to Population is a measure of those who are employed by an employer for at least 30 hours per week, and is calculated as a percentage of the total population.
Underemployed respondents are employed part time, but want to work full time, or are unemployed. Unemployed respondents are those within the underemployed group who are not employed, even for one hour a week, but are available and looking for work. Unemployment and underemployment are calculated as a percentage of the workforce.
Because results are not seasonally adjusted and there are methodological differences in data collection, they are not directly comparable to BLS numbers. However, the two measures are correlated, and Gallup's employment metrics follow the general BLS trend. Gallup reports P2P and underemployment at the state level on a semiannual basis