This cannot be answered because teaspoon is volume measure and milligram is weight. Answer would depend on density of the material. Maybe you want to convert teaspoon to milliLITERS instead.
That is 500 teaspoons.
That is 100 teaspoons
500 US teaspoons = ~0.65 US gallons.
How many teaspoons of what???
How many teaspoons is 17 g
12 teaspoons
2.25 teaspoons of water equals 0.023 pounds
Answer400 teaspoons equals about 66.7 fluid ounces.
200 teaspoons equals one liter.
5 metric teaspoons
1.01442068 US teaspoons ==
0.7 metric teaspoons