There are 0.001 molars in a millimolar i.e. 1 millimolar is equal to 0.001 molars. So if we are asked to convert millimolars to molars we just have to multiply millimolars value with 0.001. Example : to convert 38 mM to M 38 millimolars equals 38 X 0.001 molars i.e 0.038 molars.