14506 IUPAC Gold Book - birth rate 10.1351/goldbook.14506 14506 current 1 (in demography) Number of live births in a defined administrative jurisdiction in a calendar year divided by a midyear population of the jurisdiction, with the customary multiplier of \(\pu{1000}\) to produce a whole number rather than a decimal or a fraction. Note: An alternative statistic is total fertility rate, the average number of children born to each woman over the course of her life. In general, the total fertility rate is a better indicator of fertility rates because, unlike the crude birth rate, it is not affected by the age distribution of the population. (in ecology) Number of births, \(B\), in a population of a defined size, \(N\), during a specified time interval \(\Delta t\). The rate is calculated from the formula \[B = \Delta N/\Delta t\] where \(\Delta N\) is the change in the number of births in a limited time period \(\Delta t\). per capita birth rate https://goldbook.iupac.org/terms/view/14904 population https://goldbook.iupac.org/terms/view/14932 PAC, 2009, 81, 829. 'Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)' on page 854 (https://doi.org/10.1351/PAC-REC-08-07-09) https://goldbook.iupac.org/terms/view/14506/html https://goldbook.iupac.org/terms/view/14506/json https://goldbook.iupac.org/terms/view/14506/plain Citation: 'birth rate' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.14506 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-06-28T15:03:06+00:00