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This article introduces an R package, dietr, which calculates fractional trophic levels from quantitative diet item and qualitative food item data following the routine implemented in TrophLab within the open source R environment. dietr is easy to use and can quickly calculate trophic levels for many diet records. In addition to calculating trophic levels following the TrophLab routines, users can also specify a taxonomic hierarchy and estimate trophic levels at multiple taxonomic levels in a single call of a function. Additionally, dietr works well with FishBase data obtained in R using rfishbase and comes with premade databases of prey trophic levels that users can utilize for estimating trophic levels. dietr can also calculate several prey electivity indices. I provide information on dietr’s performance and provide a use case example of how dietr can be used on an empirical dataset. Trophic levels for hundreds of specimens can be calculated in a few seconds and the flexibility of dietr’s input allows users to easily calculate trophic levels from their own data.