It's tough being a metric user in an imperial world. I wonder when the US will change with the times? LOL
Here is a great site for converting speeds. You just input one of any of those measurements (min/mile, mph, kph, feet per second) and it'll calculate all of the others for you. www.convert-me.com/en/convert/speed
To get calories from kilojoules either divide by 4.2 or multiply by 0.24, whichever you find easiest.
For temperature and measurements, there is always google. I don't mean "try to find something using google as a search engine". I mean go to google and type in "Convert 8oz to grams" and see ... google has built-in conversion tools. :)