Beer Color SRM from the Malt Bill
Computes malt color units and SRM by Morey's equation for base, crystal, and roasted malts.
Example
You enter
- Base malt (lb) 500
- Base malt color (deg L) 2
- Crystal malt (lb) 30
- Crystal malt color (deg L) 60
- Roasted malt or barley (lb) 12
- Roasted color (deg L) 500
- Batch volume (gal) 310
You get
- Malt color units 28.39 MCU
- Beer color 14.8089
- Roast weight share (%) 2.21402
- Roast mcu share (%) 68.1818
- Mcu without roast 9.03226
- Without the roast 6.8 SRM -- a different style
Checked against published worked examples from: Beer Maverick.
Details, formula, and sources
ScopeThe worked bill is 28.4 MCU and 14.8 SRM. The roasted barley is 2.2% of the grain and 68% of the color units, and without it the beer is 6.8 SRM -- two pounds of roast move the color more than fifty of base.
Formula or tableMCU = sum of (lb x degrees Lovibond) / gal; SRM = 1.4922 x MCU^0.6859.
Source and editionMorey's color equation. A spectrophotometer reading of the finished beer (ASBC Beer-10) governs.
Free accessMorey's relation is published openly.
What governsEstimate. AHJ and licensed professional govern.
API field namesbase_malt_lb, base_lovibond, crystal_malt_lb, crystal_lovibond, roast_malt_lb, roast_lovibond, batch_volume_gal, mcu, srm, roast_weight_share_pct, roast_mcu_share_pct, mcu_without_roast, srm_without_roast
- Attribution the roast share is given in malt color units, the only additive decomposition a power law allowsproject method