# Grain bills and speciality grain %

### Help Support Homebrew Talk:

#### mikesmith1611

##### Well-Known Member
Due to my equipment available i am unable to do 5 gallon all grain batches so Im currently doing partial extract BIABs using about 4kg of grain and adding a minimum of 1kg of extract. I am getting about an 80% efficiency with this method.

When calculating the bill percentage for each type of malt would this be the same as for AG?

#### helibrewer

##### Supporting Member
HBT Supporter
Use the weights of the grain and extract to calculate the percentages.

OP

#### mikesmith1611

##### Well-Known Member
But 1kg of extract isnt equivalent to 1kg of grain ks it?

#### helibrewer

##### Supporting Member
HBT Supporter
How equal they are depends on the efficiency number you use....most use 75% so 1# of grain equals 3/4# of DME....however this is generally applied to the recipe formulation, so once the recipe is set, it's straight percentages by weight for the actual grain bill.