The external dimensions are: 750mm (29.5 in.) L x 450mm (17.7 in.) W x 430mm (16.9 in.) H, including the lid. The internal dimensions are: 710mm (28 in.) L x 410mm (16.1in.) W x 290mm (11.5 in.) H below the soil level.
A total internal volume of 115L, (30 gallons), which gives a total composting volume of 84L (22 gallons) due to the soil level and air flow area at the top.