Homebrewing typically refers to the brewing of beer on a very small scale, as a hobby for personal consumption or free distribution at social gatherings.

Homebrewing is a rewarding and enjoyable hobby that allows anyone with a little patience to produce microbrew quality beer at home. The actual brewing process typically takes about 3-6 hours with beer that is ready to drink in about 4-6 weeks. Contrary to some of the myths about homebrewing, it does not require a large amount of space nor does it produce unpleasant odors.

A typical batch of homebrewed beer is five US gallons (19 l) in volume, which is roughly enough for two cases — or 48 12-ounce (355 mL) bottles — of beer. In Britain homebrew is typically produced in 5 Imperial gallon (23 l) batches. In Australia, which has a strong homebrewing culture (due to both historical consumption patterns and the presence of the Adelaide-based Coopers brewery & their large associated homebrew business), a standard batch is 23l.

Equipment and books may be purchased through local home brew shops or online. In the United States, typical equipment costs are approximately $60 plus the cost of a large kettle (about $35-$50). Ingredients for a typical 5 gallon batch range from $20 to $40 depending on beer style, using dry or liquid yeast and the store's pricing. Additional costs such as bottles (which may be reused with adequate cleaning) and sanitizers should also be anticipated.