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The % Daily Value of calcium that is listed on food labels is based on 1000mg of calcium a day. So 20% DV would be 20% x 1000 = 200mg.

The easy way to calculate the change is to simply add a "0" to the %DV number to give you the mg.

i.e. 10%=100mg, 12%=120mg, 20%=200mg, 30%=30mg and so on.

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16y ago
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Q: How do you change 20 percent of calcium into mg?
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