#### TequilaMockingbird

##### Active Member

- Joined
- Aug 16, 2012

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Wonder if anyone can help me, as I am really not sure how to do the maths on this. I have finally kicked off a recipe I have wanted to do for ages. A chocolate porter with rum, raisins and banana.

My hyrdometer readings give the indication that the final ABV of the base beer will be 3.3% abv.

To the final beer I am naturally adding rum, and cannot work out the final ABV based on the following amounts and strengths. Has anyone any idea how I would go about doing this?

23 litres beer at 3.3%abv

+

20cl Rum at 37.5% vol

Bit tricky, I know, hope someone can help,

Thanks in advance!