This calculator helps you estimate how strong your distillate may be, based on the measured vapour temperature in the ethanol-water system. A lower vapour temperature generally means more ethanol in the vapour, resulting in a stronger distillate.
As the temperature rises towards the end of the run, the proportion of ethanol in the vapour decreases, and the average strength of the collected distillate begins to gradually fall as well.
Important warning: The result is intended solely for quick orientation and estimation. Actual measurements are strongly influenced by the pressure at the time of distillation, the correct placement of the temperature probe at the top of the dephlegmator or still head, the speed (reflux) of takeoff, and the actual composition of the fermented mash – the presence of natural aromatic compounds or other higher alcohols changes the simple "VLE" behaviour of water and alcohol. The alcohol content should always be physically verified at the end with a calibrated hydrometer.