Mejai ap value

Hello guys. Yesterday, I played with a Mejai, trying to stack with some good plays as LB, but everytime I got the stacks, I was like "damn, and now, how much ap it gives to me?". I mean, when you are playing a game like this, you don't have the time to calculate everytime "8x*stacks*" to know exactly if this item is worth or not. So why don't make a little value like it is on Rabadon?
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