i never switch to metric when communicating with an international audience, which i do every day at work (i’m an english teacher to mostly university-aged or older students). i guess i just think, you know, too bad. i’m giving you my best ‘normal english’ even if you have trouble with it. and along with my authentic speech comes my authentic measurements. and plus, there is basically no way in hell i could ever convert all those numbers in real time to make any of it meaningful anyway.