What do ABV, IBU and SRM mean?

ABV is alcohol by volume as a percentage. IBU (International Bitterness Units) measures hop-derived bitterness, where higher is more bitter. SRM (Standard Reference Method) measures colour, where roughly 2 is pale straw and 40 is opaque black.

Does a high IBU always mean a beer tastes very bitter?

No. IBU measures iso-alpha-acid content, not perceived bitterness. A malty, high-alcohol beer can carry 70 IBU and taste balanced, while a hazy IPA with the same IBU can taste soft because residual sweetness and aroma mask the bitterness.

What is the difference between a lager and an ale?

The split is about yeast and fermentation. Ales use top-fermenting yeast at warmer temperatures and often taste fruitier, while lagers use bottom-fermenting yeast cold-conditioned for a clean, crisp character. Both can span pale to black and light to strong.

Are these ranges strict rules?

No. The figures follow BJCP style guidelines, which are descriptive targets for competition, not legal limits. Plenty of commercial beers sit slightly outside their declared style, so treat the ranges as typical rather than absolute.

How does the style matcher work?

Enter any combination of ABV, IBU and SRM and the tool checks each value against every style's range. A style is flagged as a match only when all the numbers you entered fall inside its ranges, so leaving a field blank widens the matches.

What is the Beer Style Reference?

Reference table of major beer styles with typical ABV, bitterness (IBU) and colour (SRM) ranges from BJCP guidelines, plus a matcher that checks which styles a beer's numbers fall into. It runs free in your browser on Gera Tools, with nothing uploaded.

Beer Style Reference

Name: Beer Style Reference
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

Get one useful tool a week

Like this tool? Enter your email and we'll send you one genuinely useful Gera tool a week — plus a link to come back to this one. No spam, one-click unsubscribe any time.

Place any beer on the map

Beer styles are defined by a handful of measurable traits: how strong they are, how bitter, and how dark. This reference lists major BJCP styles with their typical ABV, IBU and SRM ranges, grouped by family, and includes a matcher that takes a beer’s numbers and tells you which styles it fits.

How it works

Three numbers describe most of a beer’s character:

ABV  alcohol by volume (%)           strength
IBU  International Bitterness Units    hop bitterness (higher = more bitter)
SRM  Standard Reference Method         colour (≈2 straw … 40 black)

Each style entry gives a typical range for all three. The matcher checks the values you enter against every style’s ranges and flags a style only when every value you supplied falls inside it. Because the check is range-based, a beer can match more than one style, and leaving a field blank loosens the match.

Tips and notes

IBU is a lab measure, not a taste score — malt sweetness and hop aroma heavily change how bitter a beer actually seems.
SRM is roughly logarithmic: the jump from 10 to 20 is far more visible than from 30 to 40, where everything looks black.
Hazy IPAs deliberately read low on IBU for their hop load because their soft, juicy profile hides bitterness.
The ranges are competition guidelines; use them to understand a style, not to disqualify a beer you enjoy.

Reading the three numbers together

The real skill in using a style reference is reading ABV, IBU, and SRM as a system rather than three independent values. A beer with an IBU of 40 reads very differently depending on its ABV and SRM context:

40 IBU at 4% ABV and 4 SRM (low alcohol, pale straw) — this is a bitter English bitter, bracingly dry and hop-forward because there is nothing to cushion the bitterness.
40 IBU at 7% ABV and 8 SRM (strong, pale gold) — a West Coast IPA where the bitterness is integrated into a full malt body.
40 IBU at 8% ABV and 35 SRM (very strong, very dark) — an imperial stout where 40 IBU is barely perceptible against the roasted malt sweetness.

The SRM scale also tells you something about flavour even without tasting. Below 10 is generally pale and light-flavoured. 10 to 18 is amber to copper, where caramel and toasted malt start to appear. 18 to 30 is brown to dark brown with roast and chocolate notes. Above 30 is approaching opaque black with prominent roast character.

Using the style matcher for brewing and judging

If you are brewing a recipe and want to know which style category your target numbers fall into, enter your planned OG, FG, expected ABV, calculated IBU, and estimated SRM. The matcher will tell you whether you are in the American IPA range, the English bitter range, or somewhere that straddles two styles.

For competition judging, the reverse is useful: a judge who knows a beer is entered as a Munich Helles can check the range (typically 3.0–5.0 IBU, 3–5 SRM, 4.7–5.4% ABV) and flag a beer that is too bitter or too dark for the category before the panel even tastes it.