# 5 gallon recipes scaled down to mr beer fermenter ANY Programs that do it

### Help Support Homebrew Talk:

#### rave808

##### Well-Known Member
I have some 5 gallon extract recipes and was wondering it there are any programs out there that if I put in ingredients for 5 gallon batch that then it will convert it down to a mr beer fermenter size batch?

#### lukeziegler

##### Active Member
I am guessing Beersmith does this. I scale 5 gallon all grain recipes on Beersmith frequently. You can also do good ol fashion math. Divide the quantity of the ingredient by 5, multiply that number by 2 (or 3, not sure what the 'Mr. Beer' fermenter size is..) You're just figuring out how much per gallon for each ingredient and then multiplying to your desired gallons...

#### roastquake

##### Well-Known Member
You can do it on brewtoad.com, it's free. but, assuming you're doing 2 gallon batches, all you really need to do is multiply each ingredient by 0.4, or just do what lukeziegler said, you'll get the same number.

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#### rave808

##### Well-Known Member
Would the number still be 4 if I used 2.5 gallons as my batch size?

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#### rave808

##### Well-Known Member
@roastquake I'm sorry 0.4 for a 2.5 gallon size?

#### stonecutter2

##### Supporting Member
HBT Supporter
@roastquake I'm sorry 0.4 for a 2.5 gallon size?
2.5 gallons is 1/2 of 5 gallons. So you'd use 0.5 instead.

#### lukeziegler

##### Active Member
It would be 0.5 for 2.5 gallons. At a 2.5 gallon batch your are just halving your ingredients. You probably still want to pitch the full yeast amount (or real close to it.)

#### roastquake

##### Well-Known Member
Aren't the mr. beer barrels made for 2 gallon batches? If the container holds 2.5 gallons, you definitely want to leave that half gallon as head-space

#### unionrdr

##### Homebrewer, author & air gun collector
I never did one,but I see it & think it should have 1/2 gallon head space myself.

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#### rave808

##### Well-Known Member
You can get 2.5 gallons in them . I've split some muntons and coopers kits in them and did 2.5 gallon batches

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#### rave808

##### Well-Known Member
One last question what is formula for scaling a 5 gallon recipe down to 1 gallon?

#### Yooper

##### Ale's What Cures You!
Staff member
Mod
One last question what is formula for scaling a 5 gallon recipe down to 1 gallon?
Divide it. That's all.

for a half batch, divide by half.

for a 1 gallon batch, a 1/5 size, divide by 1/5.

It's simple math for all sized batches.

#### argentcorvid

##### Active Member
Just in case you are wondering, you should scale your ingredients by weight.

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