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Normally, if you are taking MC for a specific reason for the first time, you should take a larger dose -- say 1/2 tspn and try to find the point where you get loose stools or diarrhea. This is called titrating the dose. This tells you that you body is getting enough magnesium and that's when you should cut back to 1/8 or 1/4 tspn a day. Every individual will have a different requirement for magnesium and this is the best way to find it.
Chris Gupta says you should take 25g/litre which works out to 2. 5gms(or 1/2 tspn) per 100 mL(or about 1/2 glass of water).
If you are using Magnesium Oil, the dosage is 10 drops two or three times a day outside mealtimes. Again you should try and find your own level by titration.