The subject of measurement system conversion comes up often on this forum as we have members worldwide. I get that it's frustrating - I have trouble figuring it out too.
I should clarify that I hope those online converters help everyone here, and not just to bug you. Sorry! And sorry to hear you are so beat after a work week.
I'm an enthusiast of these little cars, and want to help others get the most out of theirs. I certainly don't want to drive folks away.