Ask Mr. Wizard

Calculating Final Gravity

TroubleShooting

Clinton Fischer - Adelaide, South Australia asks,
Q

Could you give some tips or advice on how to best calculate the final gravity of a beer? I often nail the original gravity (OG) down by knowing my system efficiency, but occasionally I am let down by my final gravity differing from brewing software predictions.

A
Calculating a beer’s final gravity, balancing draft systems.
Response by Ashton Lewis.