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J-calculator
shagbark Started conversation Jul 12, 2010
Here is something handy-dandy from the Hubble telescope folks
http://hubblesite.org/reference_desk/calculators_and_charts/index.php#calculators
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shagbark Posted Aug 17, 2012
I notice it doesn't have square area. This one does:http://www.metric-conversions.org/area/square-miles-to-square-kilometers.htm
J-calculator
shagbark Posted Aug 17, 2012
another related site handles volume
http://www.metric-conversions.org/volume/
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