How do you guys calculate batch efficiency? I follow the instructions and enter what is called for but my numbers seem to be off. My brewhouse efficiency rarely gets over 70.

Conversion efficiency on my last batch was 101. how can it be over 100?

* I take the gravity once mash is complete and use total strike volume. Last batch the gravity was 1.045 and used 6 gallons strike water.

*Pre boil efficiency was 86%>>preboil gravity would be the same as mash complete gravity? I then measure the wort in the kettle which was 5.5 gallons.

* Ending Kettle>> post boil gravity was 1.059, I then measure the volume in the kettle, which was 4.6 gallons. 91%

* Brewhouse>> post boil gravity then fermentor volume which is 3 gallons. 69%.

I mill my own grain and the setting is .030-.031.

Do these numbers seem right?