About this data

Source: ONS, Population estimates for the UK (to 2025); ONS, National population projections: 2024-based (from 2026)

• Figures up to 2025 are ONS's mid-year estimates; after that, ONS's 2024-based principal projection, which assumes net migration of 230,000 a year from mid-2027, a fertility rate of around 1.4 children per woman and rising life expectancy. Projections are not forecasts.
• Calculated from the population by single year of age; it matches ONS's published median ages for 2011 to 2025.

This chart appears in Age structure.