Free tool
Barrel Cost Amortization Calculator
Model the true cost of an aging barrel. This estimate combines the barrel, the spirit at fill, and the carrying cost over the aging period, then spreads it over the proof gallons that actually survive evaporation. A modeled planning estimate.
The formula
cost per remaining PG = (barrel + fill cost + carrying x years) / (fill PG x (1 - loss)^years)
A modeled estimate. Evaporation ranges ~2-6%/yr; include your real overhead for accuracy. This tool uses the same calculation as the Spirit Sight platform. It is general information, not tax or legal advice.
What is the true cost per barrel of whiskey?
A fully-loaded cost includes the barrel, the spirit at fill, burdened carrying cost over the years of aging, and the value of the angel's share lost to evaporation, spread over the proof gallons that remain.
Why does evaporation raise cost per proof gallon?
Because the same total cost is spread over fewer surviving proof gallons. A barrel that loses 20% over five years concentrates its cost into the 80% that is left.
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