I grew up under the British system of things. In 1969 we converted from pound, shilling and pence to dollars and cents. As far as metrics, we are only a click away from a conversion chart.
There are just a few formulas that we need to know in regards to the metric conversion. I try not to sweat the small stuff.
Glen did you saw the super moon this weekend? I heard that it passed real close to AU this past weekend. We were cloudy all weekend.