Estimating where a beer will land before brew day is one of the most concrete things AI can help with. Done well, it turns a new recipe from a gamble into an informed plan.
What it does
Given a recipe and a little history, a tool can estimate original gravity, final gravity, ABV, and attenuation, and flag where a change to the grain bill or yeast is likely to move them. It is a fast sanity check, not a replacement for your hydrometer.
How it works, in brewing terms
The tool combines textbook relationships (fermentables to gravity, gravity to ABV) with whatever you tell it about your own kit. The single biggest lever is your real numbers: your actual mash efficiency and how far each yeast strain attenuates for you. Feed it those and the estimate stops being generic.
What you need to start
A recipe with quantities, your typical mash efficiency, and the attenuation you usually see from the yeast in question. A dozen past batches of the same style make the estimate far sharper.
"For a pale ale: 5 kg Maris Otter, 0.5 kg crystal 60, 25 L batch, my mash efficiency runs 68%, US-05 usually attenuates 78% for me. Estimate OG, FG, and ABV, and show your working."
Keeping the brewer in control
Treat the estimate as a hypothesis to confirm on the day. Your hydrometer is the authority. If the tool disagrees with a hundred of your own batches, your batches win.
Takeaways
- Estimate OG, FG, ABV, and attenuation before brew day.
- Feed it your real efficiency and attenuation, not generic figures.
- Ask for the working so you can check it.
- Confirm with measurement; the hydrometer decides.