A standard American bourbon barrel holds 53 gallons (about 200 liters). A freshly filled barrel could in theory fill a few hundred bottles, but after years of aging — once the angel's share evaporates — a typical barrel yields roughly 150 to 200 standard 750ml bottles. The longer it ages, the fewer bottles come out.
The standard barrel: 53 gallons
Bourbon is aged in new, charred American oak barrels, and the industry standard size holds 53 gallons — about 200 liters. That size has become so universal that the entire bourbon supply chain, from cooperages to rickhouses, is built around it.
The angel's share
Here's why you can't just divide gallons by bottle size. As bourbon ages, some of it evaporates through the porous oak — distillers call this lost portion the angel's share. In Kentucky's hot summers and cold winters, a barrel can lose a few percent of its volume every year. That evaporation is also part of what concentrates and deepens the flavor — so the loss is the price of a better whiskey.
Doing the math
A 53-gallon barrel is roughly 200 liters, and a standard bottle is 750ml — so on paper that's around 265 bottles. But two things change the real number:
- Evaporation shrinks the volume the longer it ages — a 6-year barrel yields fewer bottles than a 4-year one.
- Bottling proof matters: if the whiskey is proofed down with water before bottling you get more bottles; bottled at full barrel strength, you get fewer.
Net result: a typical aged barrel produces somewhere between 150 and 200 bottles.
Choose a real barrel for yourself
Want to see exactly how it works? Our Single Barrel Experience lets you taste and select your own barrel, then take home a bottle from it. see all our experiences.
Keep reading: How long is bourbon aged? · What is single barrel bourbon? · What proof is bourbon?