The development and maintenance of reef-fronted tropical shorelines and reef islands is strongly dependent upon the supply of biogenic sediments produced on the adjacent coral reefs. It is well established that a wide array of reef-dwelling plants and animals either directly (e.g., in the form of their shelly remains) or indirectly (e.g., as a byproduct of their feeding) contribute to the production of this sedimentary material. However, we lack standardised methodologies that can enable estimates of both the amounts and types of sediment being generated and the sediment size-class fractions to which this material contributes. Sediment composition and grain size are both important controls on shoreline sediment supply because they impact sediment hydrodynamic behaviour. Reliable estimates of production are thus needed to better support shoreline sediment transport and supply modelling. Here we introduce a new census-based method called SedBudget that has been set up to address this challenge. Based on a proposed set of consistent taxaspecific methodologies it generates estimates of total sediment production from reef taxa, and the types and size-class fractions of sediment generated. We then apply this data to several reef sites in the northern Chagos Archipelago to illustrate the nature of the data produced. Such data not only have potential to support coastal sediment transport modelling studies through the acquisition of site-level production estimates, but also to contribute to more integrated datasets capturing total site-level biogenic carbonate production that can