what is a 1.7kg can of stout extract equivalent to in grains?

I'm about to make a stout using a can of Coopers Stout extract but also with additional grains, which come with recommendations of, for instance, "use upto 15%". This I guess is for when doing all-grain, but I was wondering what a 1.7kg can of extract is equivalent to in grains? This is so that I can balance the additional grains with the extract.

Richy

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Richy
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