Analyse and Visualise Speech Rhythm and Timing Metrics R package rhythm.metrics version 1.1.0 Calculates and visualises speech rhythm and timing metrics. The 'rhythm.metrics' package provides a standardised workflow to compute common metrics including Delta C, Delta V, VarcoC, VarcoV, the percentage of vocalic intervals (%V), and both raw and normalised Pairwise Variability Indices (rPVI, nPVI). It includes functions for calculating and visualising these measures to facilitate cross-linguistic and developmental rhythm research. Delta C, Delta V, and %V measures are based on Ramus et al. (1999) <doi:10.1016/S0010-0277(99)00058-X>; VarcoC and VarcoV measures are based on Dellwo (2006, ISBN: 9783631554777); and rPVI-C and nPVI-V are based on Grabe & Low (2002) <doi:10.1515/9783110197105.2.515>. Software Depends: R (>= 4.5.0) Imports: dplyr, ggplot2, ggsci, magrittr, rlang Suggests: knitr, rmarkdown, testthat (>= 3.0.0) Cong Zhang <cong.zhang@newcastle.ac.uk> Comprehensive R Archive Network (CRAN) Cong Zhang [aut, cre] (ORCID: <https://orcid.org/0000-0002-2561-2113>) GPL (>= 3) 2026-09-02 application/tgz https://CRAN.R-project.org/package=rhythm.metrics doi:10.32614/CRAN.package.rhythm.metrics