Use this sociology calculation to reproduce a named demographic, inequality, mobility, urban, or survey measure when the population, period, categories, and coding rules are explicit.

Incomes

Required list. Income values in the sample; at least five entries.

The cited overview of Sociology supplies background for the terminology and domain context used by this tool.^[1]

Report the S80/S20 income ratio between the mean of the richest twenty percent and the poorest twenty percent. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

S80/S20 ratio

Returned number. Rich fifth mean income over poor fifth mean income.

• Definitions, sampling error, missing data, historical context, geographic boundaries, weighting, and classification choices can materially change social indicators and their interpretation.
• Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.

Report the source population and uncertainty, inspect disaggregated data, and compare multiple accepted indicators rather than treating one summary statistic as a complete social explanation.

• Wealth Quintile Ratio Calculator

  Divide a wealth sample into fifths and report the ratio of the richest fifth's average to the poorest fifth's.

• House Price-to-Income Affordability Ratio

  Divide the median home price by median household income and flag ratios above the classic three-times affordability line.

• Top 10% Income Share Calculator

  Compute the share of total income held by the richest decile or any chosen top fraction of a sample.