300 calories

I was looking for a recipe to use some leftover Oreos and frozen raspberries that I had bought. I found a recipe but it measured the Oreos in calories. I need 300 calories worth of Oreos. Is this a new measurement unit for baking? I found it odd. Why not say the number of Oreos needed? That might be more helpful.

James' phone is having some technical issues- it can no longer text or phone (which is typically what you need a phone for) so it needs to go into the shop. It is only 9 months old.