Conversions from common imperial units (foot, acre, cup, pound, etc) to their metric counterparts and vice versa.
All conversion factors are taken from Google and truncated to 4 digits after the decimal point. You probably don’t want to actually memorize to that precision (unless you’re crazy or your mental arithmetic is really good) so I would manually truncate the cards further after you download them.
The “Definitions” field is from Wikipedia’s conversion of units page.
I selected what I felt to be the most useful conversion factor, e.g. inches ⇔ centimeters rather than having all length units in terms of meters.
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