In short: The Angel’s Share is the portion of whisky that naturally evaporates from a cask during maturation. In Scotland, distillers typically lose around 2% of a cask’s contents each year, although factors such as age, cask size, storage conditions and climate can affect the amount. While it reduces the final volume of whisky, evaporation plays an important role in the maturation process and flavour development.
One of the terms you’ll often hear in whisky distilleries is “the angels’ share”. This refers to the small amount of whisky that evaporates during the aging process.
When whisky is slowly maturing in its cask, a small amount of whisky evaporates through the wood and into the atmosphere. Each year, a small amount of the liquid leaves the cask this way, so over the years we’ve come to think of this as a sacrifice to the heavens.
By giving the angels their share, we ensure the whisky is the best it can possibly be when it’s bottled. Why this happens and what we can do about it is just one of the more complex jobs for our Master Distiller to contend with.
WHY IT HAPPENS
There are a number of factors that affect just how much whisky is lost to the heavens; here are just a few of them.
THE AGE OF THE SPIRIT
Generally speaking, spirits tend to evaporate more quickly while they’re young, and then slow down as they age. So, at the very beginning of a whisky’s time in the cask, the angels’ share will be right at the top of the spectrum – around 3.5% to 4% every year.
As it ages, the whisky will keep evaporating (it will never stop), but it will do so at much lower rates. By the end of its maturation period, a 20-year-old Scotch might lose 40% of its volume. Learn more about how age affects flavour in our guide to whisky maturation.
THE SIZE OF THE CASK
This is all to do with where the liquid meets the wood. So, whiskies stored in smaller casks will evaporate more, because they just have that much more liquid-to-wood contact. In our experience, casks that hold fewer than 50 litres can show really remarkable losses, which also leads to a faster maturation.
THE CLIMATE IT’S KEPT IN
A really good way to illustrate the impact of climate on evaporation is by looking at the bourbon warehouses in Kentucky, the south-eastern US state. During a Kentucky summer, the top floor of a warehouse might hit 50-60C, while the bottom floor may only be 20C. This makes a huge difference to the speed of maturation and evaporation; the casks on the warmer floors will lose liquid very quickly.
Kentucky is humid, too, which means water leaves the cask first (rather than alcohol), strengthening the spirit. That’s in contrast to what happens here in our maritime-influenced Speyside climate, where it’s the alcohol that leaves the spirit first.
Climate is one of the key factors that makes Scotch whisky maturation different from bourbon and other world whiskies.
THE WAY IT’S STORED
Airflow has an impact. In bigger warehouses, casks are often stored on racks or pallets, which means they’re raised slightly from the ground. Air circulates around them, leading to greater evaporation. At The Glenlivet, we have a traditional (dunnage) warehouse, with a gravel floor and only a small number of casks. This helps us to hold on to liquid as best we can.
These are just some of the factors that affect the angels’ share. This is something that requires constant and careful attention from our experts at the distillery.
ANGEL’S SHARE VS DEVIL’S CUT
The Angel’s Share refers to the whisky that naturally evaporates through the cask during maturation.
The Devil’s Cut is a term used to describe the whisky that remains trapped within the wood of the barrel after the liquid has been emptied. While the Angel’s Share disappears into the atmosphere, the Devil’s Cut stays absorbed in the oak itself.
Both terms highlight how casks influence whisky over time. The Angel’s Share contributes to concentration and maturation, while the whisky absorbed into the wood demonstrates just how much interaction takes place between spirit and cask during ageing.
WHY THE ANGEL’S SHARE MATTERS
While losing whisky to evaporation might sound frustrating, it’s an essential part of maturation. As spirit slowly interacts with the cask and the environment around it, flavours become more concentrated and complex.
The Angel’s Share is one of the reasons older whiskies are rarer, more valuable and often more sought after. Every bottle represents years of careful ageing — and a small sacrifice to the heavens along the way.
Curious about what happens after maturation? Explore our guides to cask selection, chill filtration and how Scotch whisky is made to discover how every stage shapes the final dram.