This dataset presents estimates of total carbon stored in vegetation across Great Britain (GB). Presented as carbon density (tonnes per hectare) the data was obtained by estimating carbon density values for each land cover type and then projecting across GB using the 2007 Land Cover Map. Countryside Survey data from 2007 was also used to derive the carbon density estimates for each land cover type and as such the dataset is a representation for 2007. Changes in size and productivity of the aboveground carbon pool may act as a sink or source for carbon dioxide. As such, the carbon stored in vegetation and its spatial distribution plays a vital role in climate regulation.