It would be nice if everyone used the same units, my meter is from the US, my libre is from Singapore, my a1c is measured in %. I just plug the numbers into my iPhone and it will convert when changing the units.
I actually have my phone set to mg/dl, and the mySugr app set to mmol. MySugr will generate an approximate A1c value, mine reads in %.
test just before you eat and two hours after.