text: how to convert logcfu/ml to g/ml? hello!!! how can i convert log cfu/ml to g/ml (in microbiology) please, i really need it. logcfu refers to the number of colony forming units of a bacteria, to work out the g/ml you need to know the weight of the bacteria. as its the g/ml i guess you're looking at wet weight. the average weight of a bacteria is 9.5e-13 g [1]. then you have to consider the size of the colony, it is normally assumed (for simplicity) that the bacteria have been diluted, so that they could be counted, to the extent that 1 bacteria = 1 cfu. essentially this means that cfu*9.5e-13 = g/ml  hope this helps