Quarter Teaspoon.
one quarter
1 clove = one teaspoon. 1/4 teaspoon = 1/2 clove.
Although some recipes are quite sensitive, in most cases the difference between one half and one quarter teaspoon of baking powder would not be noticed.
Milligrams is a measure of mass, a quarter teaspoon is a measure of volume, the two forms of measurement cannot be interchanged without knowing the density of the substance, meaning you can't measure milligrams by a teaspoon or any fraction of a teaspoon.
1 Teaspoon is 2300 milligrams so a quarter would 575 milligrams roughly
There are 3 teaspoons in 1 tablespoon. So 1/4 of a tablespoon is 3/4 of a teaspoon.
1 teaspoon == 5 cc so 1/2 teaspoon == 2.5 cc
You will die
A teaspoon and a half, or 7.39 milliliters
That is 3/4 teaspoon.
4 quarter teaspoons is a full teaspoon, or 5 grams of water.