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I didn't know about that! Strange interface, though -- why isn't the first response just "2.27kg"?

Because a kg goes into 5 lbs 2.2679619 times, and 5 lbs goes into 1 kg 0.44092452 times.

The first number is the one I want, pretty much 100% of the time, and I hardly ever need 8 digits of precision.