Here is an ABV density lookup table I use to calculate the alcohol density of my moonshine or brandies to calculate the exact volume of litres I have from the weight of the spirit. You can use it too.
Its from the International Organisation of Legal Metrology.
The International Alcometric Tables.
How to Calculate the Volume of your spirit when weighing your samples.
How to Calculate the Volume of your spirit when weighing your samples is easy mathematics.
1. Weigh your bottle of spirit.
2. Weigh the empty container and calculate the net weight of spirit.
3. Look up the density of your spirit on the table above. You will need to know the ABV, by hydrometry etc.
4. Divide the weight of your spirit by the density.
NB the density is in kg per cubic metre.
Example to Calculate the Volume of your spirit
Weight of Bottle of Spirit minus the bottle weighs 2.32 kg
The alcohol by volume (ABV) is 45%.
Therefore the lookup density is 939.54 kg/ m3 or 0.93854 kg/litre
And 2.32 / 0.93854 = 2.47 litres