As CC says. It all depends on the steroid you're using. Test prop and Test E have different amounts of active ingredient in each 1ml of oil.

You need to know exactly what you are using and exactly the ratio of active ingredient to oil. For example, Test E can have a different ratio depending who makes it.

Pharmatest do Test E at a ratio of 600mg/ml (apparently) so if you didn't realise and you injected 1ml per twice a week you'd be pinning 1200mg per week thinking it was just 500mg. That's a good way to grow a pair of tits

It's also why you must keep asking until you get it right.