When looking at beer menus at a local brewery or exploring the offerings at breweries in Warrington, you may have noticed a number printed alongside the beer description. This number, which is often labelled as IBU, plays an important role in helping beer drinkers to understand what to expect from each pint. We are often asked what is the IBU scale and how it impacts the flavour of your favourite beers. This guide today shares everything you need to know about the IBU scale, bitterness in beer, and explains how to use these numbers when choosing your next drink at 4T’s Brewery.
What Does IBU Mean?
The acronym IBU stands for International Bitterness Units. In the most basic terms, it’s a standardised measurement used across the beer industry to quantify bitterness. If you’ve ever wondered what is the IBU beer scale, the answer is that it gives brewers and drinkers a way to compare how bitter different beers are. Bitterness in beer comes mainly from hops, which are added at different stages of the brewing process. Hops contain compounds called alpha acids, and when these acids are boiled during brewing, they break down, creating bitterness. The more alpha acids from hops that are present in the final beer, the higher the beer’s IBU rating.
It’s important to note that the IBU scale measures the concentration of bitter compounds, not the perceived taste of bitterness. This means that other factors, such as alcohol content and malt sweetness, can also influence how bitter a beer feels.
What is the IBU Scale?
The IBU beer scale ranges from 0 to over 100, though most beers fall somewhere between 5 and 120. A rating of 0 IBUs indicates no detectable bitterness, while high-IBU beers may reach 80 IBUs or more.
High IBU Beers
A high IBU beer typically means a high level of bitterness. Beer styles such as double IPAs, West Coast IPAs, and some strong ales regularly exceed 60 IBUs. For knowledgeable beer drinkers, these beers are appreciated for their intensity and bold flavour. A common misconception is that a very high IBU automatically means a beer will taste extremely bitter. As we mentioned earlier, sweetness from malt or higher alcohol levels can help to soften the bitterness. This is why some brews with 80+ IBUs may not taste as bitter as expected.
Medium IBU Beers
Beers in the 20–50 IBU range offer a balanced profile and are great for anyone looking to take their beer discovery journey a little further. Bitterness in these beers is noticeable but not overpowering. Classic bitters and pale ales are usually part of this category, offering some complexity without too much bitterness.
Low IBU Beers
Beers with low IBUs, typically 5-20, tend to be smooth, light, and easy to drink. Many lagers, wheat beers, and cream ales fall into this category and are a good option for anyone new to beer. As these beers don’t rely heavily on hops for flavour, the bitterness is minimal and often barely noticeable. If you prefer gentle, refreshing beers without a sharp bite, low-IBU beers are an excellent choice.
How Are Beer IBUs Calculated?
The calculation for beer IBUs involves measuring the amount of iso-alpha acids extracted from hops during boiling. Brewers use a formula that accounts for hop quantity, alpha acid percentage, boil time, and wort volume. Modern brewing equipment helps to get very precise IBU measurements, which support consistency across batches. This is something that keen beer drinkers value highly when revisiting a favourite beer, as they want to have the same taste experience over and over again.
How to Use the IBU Scale When Choosing a Beer
When visiting breweries in Warrington or sampling pints at any local brewery, the IBU figure can help guide your choices. If you prefer a mild beer, we recommend looking for something under 20 IBUs. For balanced and flavourful ales, try beers in the 20 to 50 range. Finally, hop lovers should look for IPAs with 60+ IBUs. As with all things beer, experimentation is key. Many drinkers who start with low-IBU beers gradually move on to higher-IBU beers as they become familiar with different styles and are willing to take more risks.
The IBU scale is a valuable reference point for anyone interested in exploring beer more deeply. Knowing how the scale works will enhance your enjoyment and help you to explore new beers during your next visit to our brewery. On your next visit to our local brewery, take note of the IBU numbers listed and use this guide to point you in the right direction when selecting your drink that day. Our team will be here to answer any questions you have about our range of beers, so don’t hesitate to contact us for more information.