Just wondering about powder. If I had 1 gram of test powder how many mg of useful test is in it?

Depends on the ester.
M.Ed. Ex Phys
Lets say base
1000mg, but why would you brew up only 1g at a time?
M.Ed. Ex Phys
A simple Google search would have yielded the answers you need.
M.Ed. Ex Phys
1000mcg = 1 mg
1000mg = 1 G
1000G = 1 Kg
1000Kg = 1 Ton
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