I drive in kph and buy gas in litres, but weigh ~180 pounds and am 5' 10" tall. ¯\_(ツ)_/¯
If you're going to convert systems, some useful things to keep in mind:
> Naughtin’s 1st Law: Dual-Scale Instruments are Evil […] Currently, this is a hard rule to apply consistently in the U.S., because well-designed purely metric measures are almost impossible to find. This is particularly the case in kitchen measures. One can find measuring spoons with metric markings, but these are usually smaller than the imperial markings, and the numbers make it clear that the metric markings are an afterthought. A tablespoon, for example, may carry the secondary legend of “15 mL,” or even “14.7 mL,” as though recipes regularly called for such awkward amounts.
> Naughtin’s 2nd Law: Prefer Measures Without Decimals […] One rather startling fact about the Australian metric conversion is that nearly all of their industries opted for the millimeter as their preferred unit of measure, including the construction industry. The plans for Australian houses are drawn up in millimeters. […] Because decimal numbers are eliminated from the blueprints. Which means that the guy on the job site running the radial arm saw never has to deal with anything but whole numbers. Which means that he makes fewer mistakes. Which means that waste is greatly reduced.
> Naughtin’s 3rd Law: Don’t Change Measures in Midstream […] The most common wine bottle today is 750 milliliters. What then should we call a bottle exactly twice that size? For a number of reasons, including the fact that it would make the columns in the shopkeeper’s inventory spreadsheet more readable, because it saves the customer from the mental effort of shifting a decimal, and because it precludes the need for a decimal at all (see 2nd Law, above), the Metric Maven strongly advocates 1500 milliliter wine bottles (and responsible consumption). Wine bottles in this size, however, are usually labeled 1.5 liters. Wine shop advertisements may flip-flop between liters and milliliters, decimals and whole numbers. This is not, for once, a matter of U.S. metric obstructionism, but a matter of worldwide metric obtuseness. Even metric countries could do metric better.
> Naughtin’s 4th Law: No Centimeters! Actually, no centi-anything. Also, no deci-anything, no deca-anything, and no hecto-anything. But the centimeter is far-and-away the most common violation of this rule, and the only one most of us ever hear much of, so it gives its name to the law. […] Drop these four prefixes, and there are only two remaining that non-technical people will ever have to deal with commonly: kilo for thousands, and milli for thousandths. Conversions between measurements become almost unnecessary, and on the rare occasions when they do crop up, there is one and only one conversion factor to remember: 1000.