What is the formula for calculating z move power?

Question

People surely must know, to calculate the power of moves like astral barrage as it has been newly introduced

Answer 1

There's no specific formula. Z-Move power is decided upon the move's Base power.

Here's the table for how the move power is decided:

Source

Comments

The asker asked for Z Moves not Max Moves ig

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The table shows for both of them.

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Oops, my bad! Sorry let me edit that in.