## Calc Extract Efficiency when using lactose.

**Moderator:** slothrob

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**1**of**1**### Calc Extract Efficiency when using lactose.

I am trying to calculate my extract efficiency for an all-grain brew in which I added lactose.

I know all the factors for grains, but I also added 1 pound of lactose (to make a sweet stout). Given that I made 5.5 gallons of brew, can anyone tell me how many points of gravity were contributed by the 1 pound of lactose.

OG was 1.056

I had 9.5 pounds of grain and 1 pound of lactose.

I know all the factors for grains, but I also added 1 pound of lactose (to make a sweet stout). Given that I made 5.5 gallons of brew, can anyone tell me how many points of gravity were contributed by the 1 pound of lactose.

OG was 1.056

I had 9.5 pounds of grain and 1 pound of lactose.

- cajun
**Posts:**3**Joined:**Mon May 20, 2002 10:24 am

### I Estimate 73%

The SG for lactose is 43 (sourced from the book, Beer Captured. Ok, now the calculations:

Lactose: 1# @ 43 pts = 43 gravity units (GU)

Total Brew: 5.5 gal @ 56 = 308 GU

Grain Contribution = Total Brew - Lactose = 308-43 = 265 GU

Theorectical Max from Grain: 9.5# @ 38 = 361

Efficiency: Grain Contribution/Theorectical Max = 265/361 = .734 (73%)

If someone could double-check my work, plz. Hope this helps, were you expecting this figure?

v/r

Bill

Lactose: 1# @ 43 pts = 43 gravity units (GU)

Total Brew: 5.5 gal @ 56 = 308 GU

Grain Contribution = Total Brew - Lactose = 308-43 = 265 GU

Theorectical Max from Grain: 9.5# @ 38 = 361

Efficiency: Grain Contribution/Theorectical Max = 265/361 = .734 (73%)

If someone could double-check my work, plz. Hope this helps, were you expecting this figure?

v/r

Bill

- BillyBock
- Imperial Stout
**Posts:**561**Joined:**Sun Dec 31, 2000 12:37 pm**Location:**Ohio

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