Bread hydration formulæ

Legend

— Mh20 weight of water
— Mflour weight of flour
— %hydr hydration

To get hydration percentage when weights of water and flour are known:

Mh20

  ×   100%hydr
Mflour

To solve for water when weight of flour and hydration are known:

Mflour   ×     %hydr     =   Mh20