A teaspoon is actually a volume measure; 1/4 teaspoon equals 1.25 milliliters.
If you really need weight instead of volume, ground cinnamon weighs 2.8 grams per teaspoon. Therefore, one quarter of a teaspoon of cinnamon weighs 0.7 grams, or 700 milligrams.
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There are 1000mg in 1g of cinammon. There is 2.26g in one tsp of cinnamon, so there is 2260mg in one tsp of cinnamon.