How to Calculate Angel's Share (With Examples)

The "angel's share" is the spirit that evaporates as it matures. Here's how to measure it.

The formula

Angel's share % = (Fill volume − Current volume) ÷ Fill volume × 100

Worked example

A cask filled with 200 L now measures 188 L:

(200 − 188) ÷ 200 × 100 = 6% volume loss

Because strength can also shift, track both volume and ABV to understand the true loss in litres of pure alcohol (LAL).

Why it matters

• Value — it tells you how much sellable spirit you actually have
• Compliance — documented losses keep your excise records clean
• Insight — high losses may point to warehouse conditions or cask quality

How to track it

Log periodic measurements over each cask's life. CaskPilot calculates angel's share automatically from those readings — see the cask management guide.

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