This R package contains functionality to construct model-based hypervolumes as described in the manuscript titled "Model-based hypervolumes for complex ecological data" (Jarvis et al (in press) Ecology). Briefly, the package provides functions to fit multivariate normal distributions with random effects to simulated or real data and use these to define a model-based hypervolume. Functions are provided to calculate hypervolume size, look at overlap between hypervolumes and to test inclusion of individual observations in hypervolumes.