Parti-Gyle Calculator Instructions

Partigyle Instructions

This calculator is primarily for assessing the strength of historic brews, but it can be used for your own brews for simulation or if you want to try out a partigyle brew.

Fill in the boxes with blue labels.

Malt kg

Weight of malt in kilograms.


English brewers refer to liquor, not water.

Extract LDK as is

Terms seen on malt analyses. Hot water extract defined as Litre degrees per kilogram. As is does not include moisture. If a number of malts are used LDK can be determined by weighted averages. When simulating historic beers use the value given in the book (to come later).

Extract Potential %

If LDK is not available potential extract percent can be used here. Any figure in LDK will be ignored.

Malt/Liquor Ratio

Thickness of the mash in litres of wort to kilograms of malt

Conversion Efficiency

Extent of the conversion of starch to sugars. For simulating historic beers use 100%. When making your own beers adjust according to the efficiency of your system.

Absorption Rate

Absorption of liquor by malt in litres of liquor per kilogram of malt. The first mash will absorb liquor at this rate. This figure may be altered. Set at 1 ltr/kg.  Historically, brewers reported a range of values, however 1 ltr/kg is close to the average. For your own beers you may find the value to be lower. Some use a value of 0.8 ltr/kg. My own experience is 0.95 ltr/kg.

Collected Wort

Enter the volume of wort collected from the mash.

% Evaporation in Boil, Coolers etc.

Evaporation in the boil reduces volume and increases the gravity. Historically, brewers also had evaporation from the coolers. Enter the total evaporation percent to find the new volume and specific gravity.

Combined Worts

A parti-gyle brew produces worts of  diminishing strength, the first being the strongest and the last, the weakest, known as small beer. Each wort could be combined with others to make beers of defined strength. When all worts were combined the product was known as “entire”. This calculator provides combinations of worts and the result of evaporation in boiling and the coolers.