Calculate IVs of Raid Boss CP?

We don't even know the formula yet, not sure if it includes IVs.

But I guess it is 100% IV.

Why would you want to know the IV of the raid boss?

All trainers that capture the raid boss receive unique IVs and move sets. Knowing the IV of the raid boss brings zero benefit to trainers. The only thing that benefits a trainer before battling a raid boss is knowing its moveset so a vaporeon doesn't get caught off guard by a wildcharge.

Raid boss will always have the Same cp. And After you beat it everyone will get an individual one with Differenz ivs and moves