This calculator estimates beer color in SRM and helps you understand how light or dark your homebrew may be based on the amount and type of grains used in your recipe.
It uses Morey’s Formula, a common method for approximating beer color from grain bill data.
The Standard Reference Method (SRM) is a numerical scale used to represent beer color. Lower SRM values indicate lighter beers, while higher values indicate darker beers. In most brewing references, SRM values above 40 are typically considered black.
This tool is intended for approximation and recipe planning.
SRM Formula
SRM = 1.4922 × (MCU ^ 0.6859)
Where MCU means Malt Color Units.
What SRM Means in Brewing
SRM gives brewers a practical way to estimate the appearance of a finished beer before brewing. It is especially useful when adjusting a grain bill to achieve a pale golden lager, an amber ale, a deep brown porter, or a near-black stout.
In general:
- Lower SRM = paler beer
- Medium SRM = amber to copper tones
- Higher SRM = dark brown to black beer
EBC and SRM
Another common beer color scale is EBC. It is widely used in Europe and can be estimated from SRM using this approximation:
EBC ≈ 1.97 × SRM
Brewing Terms Explained
SRM
A beer color scale used to describe how light or dark a beer appears.
MCU
Malt Color Units, a value based on grain color, grain weight, and batch size. MCU is used as the starting point for estimating SRM.
Morey’s Formula
A brewing formula used to convert MCU into a more realistic SRM estimate, especially for darker beers.
Grain Bill
The total combination of malts and grains used in a recipe.
Batch Size
The final volume of beer being brewed. Batch size affects calculated color intensity.
Liberty Craft Journal Note
At Liberty Craft Journal, we build practical brewing tools and simple educational guides to help brewers plan recipes, understand calculations, and create better beer with more confidence.