After pressing "Calculate", two diagrams appear after a few seconds.
The x-axes of both diagrams represent the liter of distillate. On the left the distillation starts, on the right the boiler is distilled completely empty.
The large upper diagram shows ethanol (black), water (blue) and the congeners to be selected individually above. Different types of representation can be selected.
The small lower diagram provides the general information about the amount of distillate, alcohol strengths and temperatures. With a mouse click on one of the diagrams the values can be displayed at the cursor.
If the cursor is moved over a button of a congener without pressing, other names and also further information about this congener will be displayed.
The congeners are ordered within their group (e.g. "ester") according to their molar mass. So on the far left is the smallest ester (ethyl acetate) and in the second row on the far right is the largest (ethyl caprinate). In general terms, within a group of congeners, the larger molecules are those with the better aroma or those from which the more interesting aromas can be created.
The various representations show how the congeners react to different situations, such as the alcohol strength in the boiler at the start of distillation or the number of theoretical plates. Some representations are comparative. That is, you can select a substance with whose values the other congeners are compared.
Here are explanations of some representations that are difficult to understand at first glance:

• The amounts in the total dist. div. by the total amounts of the compounds (0 - 1)
  The total quantities of the substances collected up to a certain point in time are shown. The x-axis is the total distillate collected so far. The y-axis shows the total quantities of the selected substances. Since the calculation should be independent of how much of the congeners is initially in the boiler, the y-axis goes from 0 - 1, one could also write 0% - 100%. Since sooner or later everything gets into the distillate, all curves therefore go from left 0 to right 1.
• Concentrations of the compounds in the current distillate (min - max)
  Here you can view the changes in the current concentrations. So it's not what quantities you've collected in total up to a point in time, but what concentration is distilled off at the moment. The y-axis goes from the minimum to the maximum. Since the minimum and the maximum are different for each substance, each substance also has a different y-axis. Which values the minima and maxima have, depends of course also on the quantities, which are before the distillation in the boiler. However, since the calculation should be independent of concrete quantities and because each substance would require a different y-scale, in this representation the y-axis is without scale and no values are output under the congeners buttons.
• Concentrations of the compounds in the total distillate (min - max)
  Here we are concerned with the changes in concentrations in the total distillate collected. This representation is interesting, since one can recognize here, when the concentration of a congener decreases, if one continues to distill. This depends not only on its volatility, which is constantly increasing, but also on how much of the congener is still in the boiler.
• Shares of the curr. qtys in the total qtys of the compounds relative to ...
  This is mathematically somewhat special, since the computer calculates with concrete quantities, thus takes a (very small) concrete value for "current quantity", although this would have to be infinitely small to be really "current". Since the calculator calculates the distillation in 100000 smallest steps, "current quantity" means 1/100000 of the fictitious quantity in the boiler. So the calculator calculates in this way concrete values for "amount of the substance in the current steam per its total amount". And since the calculator does the same for the selected reference substance, this is then mathematically cut out at the end, since the two values are then compared or divided. So in longer terms:
  The amount of the represented substance in the current vapor per its total amount divided by the amount of the reference substance in the current vapor per its total amount.
  Or mathematical:
  (The amount of the represented substance in the current steam / The total amount of the represented substance) / (The amount of the reference substance in the current steam / The total amount of the reference substance).
  The concrete quantities with which the computer calculates are then no longer important and the displayed curves and values have a universal meaning. The y-axis is therefore dimensionless. And it is unimportant whether "quantity" is a volume or a mass, because it is mathematically cut out.
• Shares of the qtys in the tot. dist. in the tot. qtys of the compounds rel. to ...
  Here, too, the result of comparing or dividing is that the y-axis is dimensionless, and likewise it does not matter whether volume or mass is meant by "quantity". But since we are not dealing with actual but with total quantities, it is mathematically simpler and also easier to understand. Expressed a little longer: In longer terms:
  The amount of the represented substance in the total distillate up to that point per its total amount divided by the amount of the reference substance in the distillate collected up to that point per its total amount.
  Or mathematical:
  (The amount of the represented substance in the total distillate up to that point / The total amount of the represented substance) / (The amount of the reference substance in the total distillate up to that point / The total amount of the reference substance).
  

Contraction is taken into account in all calculations.
Since almost no one has an absolutely accurate thermometer, an additional "thermometer error" can be specified. This can be determined with the help of the calculator Thermometer Error. Temperatures entered or calculated here are then those displayed on this thermometer, not the real ones. But since this calculator is not really about temperatures, this function is not very important here.

More information about congeners and calculation examples
Information about our boiling point data and about the influence of atmospheric pressure