Calculate alcohol by volume from original and final gravity readings.
Correct your hydrometer reading for temperature differences.
Calculate how much sugar to add to reach your target gravity.
Calculate campden tablet or potassium metabisulphite dosage for your must.
Convert between SG, Brix, Oechsle, Baume and potential alcohol.
Scale any recipe up or down to match your batch size.
Calculate tartaric, malic or citric acid additions to adjust pH.
Calculate water additions to reduce sugar or alcohol content.
Calculate the correct water volume and temperature for rehydrating dried yeast.
Predict final ABV from your pre-ferment gravity reading.