Fortification (spirit addition)

Current alcohol (%v/v)
Desired alcohol (%v/v)
Spirit alcohol (%v/v)
Volume of wine
Volume of spirit to add

Details:  This calculator works in the same way as a traditional Pearson's square.  It is used to give the volume of spirit (of known alcohol content) to add to a volume of wine wine (of known alcohol content), to bring it to a desired alcohol content.

This calculator is simple, the calculation is exactly the same as a traditional Pearson's square.  The following is the formula used:

spirit_to_add = vol_of_wine / ( ( spirit_alc_concentration - desired_alc_concentration ) / ( desired_alc_concentration - current_alc_concentration ) )

VinoCalc by Jonathan Musther  -