Brewgravity

BJCP 2021 · 1A · Standard American Beer

American Light Lager

The BJCP 2021 vital statistics for American Light Lager (style 1A), with the numbers worked through for a 19 liter batch.

SpecificationRange
Original gravity (OG)1.028 – 1.040
Final gravity (FG)0.998 – 1.008
Bitterness (IBU)8 – 12
Color (SRM)2.0 – 3.0
Color (EBC)3.9 – 5.9
Alcohol (ABV)2.8 – 4.2%
Appearance Straw
Apparent attenuation at the midpoint91%
BU:GU ratio at the midpoint0.29 — clearly malt-forward

A starting point for a 19 liter batch

Aiming at the middle of the range, at 72% brewhouse efficiency, using base malt at 36 PPG:

  • 3.0 kg (6.6 lb) of base malt to reach OG 1.034. Specialty malt displaces some of that and usually contributes fewer points.
  • 6 g (0.2 oz) of a 10% alpha pellet hop at 60 minutes for 10 IBU. Late and whirlpool additions add aroma without moving this much.
  • A yeast attenuating around 91% to finish near FG 1.003. Mash temperature will move this by several percent in either direction.

These are arithmetic, not a recipe — they tell you the size of the grain bill and hop charge you are aiming for, so you can tell straight away whether a recipe you are looking at is in the right territory.

Reading the numbers

At the midpoint of the ranges this style is clearly malt-forward — a BU:GU ratio of 0.29, meaning 10 IBU against 34 gravity points. The gravity range implies about 91% apparent attenuation, which is what you should be selecting a yeast for.

A beer in the middle of this style lands around 3.5% ABV. The ABV calculator will tell you where yours actually finished once you have both gravity readings.

Judges assess against the full written style description — aroma, flavor, mouthfeel and history — not only these figures. The BJCP guidelines carry the complete entry. What the numbers give you is the target to design a recipe against.

Other styles in Standard American Beer

All 110 BJCP 2021 styles →

Design a American Light Lager recipe

Brewgravity shows your gravity, bitterness, color and alcohol against this style’s ranges as you build the recipe, so you know before brew day whether it lands in the box.

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