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Message: <blockquote data-quote="Umbran" data-source="post: 4742406" data-attributes="member: 177">Not quite, as some of the various scales in which the work is done overlap.  I don't have problems switching units because I do it on a regular basis - often into either Imperial or SI because I teach folks who haven't ever needed the more technically used units.  If you do it often, there's no issue - it isn't like the human mind can't handle two or more sets of units at once, with a little practice.  I think you missed the point.  What is mentally easiest is what's most convenient for your purposes.SI units are extremely useful for the civil and mechanical engineers, and scientists who work with things on the level of normal human experience in terms of sizes, masses, and temperatures.  These happen to be most convenient because they are anchored in physical properties of materials that matter to their work.For normal day-to-day living, I don't think it matters much whether you work in Ounces or Grams, inches or centimeters.  They're all of the right scale, so when you go to the grocery, or try to measure an inseam, both systems give you numbers in the useful ranges for humans.  Lacking a technical reason to choose one over another, what is mentally easiest is what you already use.</blockquote>