How to Use This Calculator
This tool helps whisky cask owners and prospective investors calculate the true cost price per bottle — the figure that reveals whether a cask is fairly priced and what margins to expect if you bottle.
- Step 1 — Cask details: Enter your cask's current bulk litres and ABV (from the certificate or a re-gauge report). If you have an RLA figure from a re-gauge, switch to "RLA + ABV" mode.
- Step 2 — Angel's share projection: If you plan to hold the cask longer before bottling, enter the additional years. Scotland's average volume evaporation is 2% per year; warmer climates can be 5–10%.
- Step 3 — Purchase and holding costs: Enter what you paid for the cask, plus annual storage and insurance.
- Step 4 — Bottling costs: Enter your bottling fee per bottle (labour/filling), dry goods cost per bottle (glass, closure, label), and one-off transport. The UK spirits duty rate and VAT are pre-filled to current 2026 rates but are editable.
- Read results: The calculator shows your bottle yield, LPA, angel's share loss, the full duty+VAT bill, total all-in cost, and the resulting cost price per bottle — before any margin or retail markup.
Why the Simple Cask Price ÷ Bottles Calculation Is Misleading
Many cask investment promotional materials show a large bottle count alongside the cask price, implying an attractive "per-bottle cost". But this calculation ignores the biggest costs that sit between the cask and a finished bottle on a shelf:
- UK Spirits Duty + VAT: As of February 2026, duty is £33.99 per Litre of Pure Alcohol (LPA), plus 20% VAT on the duty — totalling ~£40.79 per LPA. For a 250-litre hogshead at 60% ABV (150 LPA), that alone is over £6,000.
- Bottling fees: Commercial bottling runs typically cost £4–8+ per bottle for labour and filling.
- Dry goods: Glass bottles, closures (corks/screw caps), labels, and capsules add £3–7+ per bottle depending on quality.
- Cask transport: Moving a cask to a bottling hall requires specialist bonded haulage, typically £500–900 per move.
- Accumulated storage and insurance: Holding a cask for 10 years at £230/year adds £2,300 before a single bottle is filled.
Adding these up often raises the per-bottle cost price by 40–70% over the "cask price ÷ bottle count" shortcut.
Understanding Key Terms
Bulk Litres
The total volume of liquid in the cask, regardless of alcoholic strength. A hogshead typically holds 225–250 bulk litres when new; after years of angel's share evaporation, this will be lower.
LPA / RLA / OLA
LPA (Litres of Pure Alcohol) is the industry standard measurement: Bulk Litres × ABV%. It is what HMRC uses to calculate duty. RLA (Regauged Litres of Alcohol) is the LPA measured at a re-gauge — the most reliable figure for older casks. OLA (Original Litres of Alcohol) is what was in the cask when first filled.
The Angel's Share
The natural evaporation of liquid and alcohol through oak staves during maturation. In Scotland's damp climate, volume loss averages around 2% per year, with the ABV typically dropping slightly as alcohol evaporates faster than water in humid conditions. In warmer, drier climates such as Kentucky or India, losses can reach 5–10% per year. Over a 15-year hold at 2%/year, roughly 26% of the original bulk litres will have been lost.
Bottling ABV and Dilution
Diluting the cask with water before bottling lowers the ABV but increases the volume of liquid and therefore the number of bottles. Bottling at 40% from a 60% ABV cask produces 50% more bottles than bottling at cask strength — but each bottle contains less pure alcohol. The LPA (and therefore the duty bill) is the same regardless of whether you dilute or not.
Typical Cask Sizes and Approximate Yields
- American Standard Barrel (ASB/Bourbon barrel): ~200 litres. Yields approximately 260–285 bottles at 70 cl, cask strength.
- Hogshead: ~225–250 litres. Approximately 325–360 bottles at 70 cl, cask strength.
- Sherry Butt: ~475–500 litres. Approximately 650–700 bottles at 70 cl, cask strength.
- Puncheon: ~450–500 litres. Similar yield to a butt.
- Quarter Cask: ~125 litres. Approximately 160–180 bottles.
- Octave: ~50 litres. Approximately 65–70 bottles.
These are indicative figures at cask strength. Actual yield depends on the cask's current bulk litres, ABV at bottling, and bottle size chosen.
Frequently Asked Questions
How do I calculate the number of bottles I can get from a whisky cask?
Calculate your LPA (Bulk Litres × ABV%). If bottling at a lower ABV, divide LPA by the target ABV to get the bottling volume in litres, then divide by the bottle size in litres (0.7 for a 70cl bottle). For example: 250 bulk litres at 60% = 150 LPA. Bottled at 46% into 70cl bottles: (150 ÷ 0.46) ÷ 0.7 = 465 litres ÷ 0.7 = ~465 litres → 464 ÷ 0.7 ≈ 466 bottles. At cask strength (60%): (150 ÷ 0.6) ÷ 0.7 = 250 ÷ 0.7 = ~357 bottles.
What is the angel's share and how much should I expect to lose?
The angel's share is the natural evaporation of liquid and alcohol through the porous oak staves during maturation. In Scotland, a standard hogshead or barrel loses approximately 2% of its volume per year; in warmer, drier climates like Kentucky or India the rate can be 5–10% annually. Over a 20-year hold at 2% per year, roughly 33% of the original bulk litres will have evaporated. This reduces both your bottle count and can affect the ABV depending on climate.
What is UK spirits duty in 2026 and how does it affect my bottling costs?
As of February 2026, UK spirits duty for spirits over 22% ABV (which includes all whisky) is £33.99 per Litre of Pure Alcohol (LPA). VAT at 20% is charged on top of the duty amount, so the combined effective rate is approximately £40.79 per LPA. For a 250-litre hogshead at 60% ABV (150 LPA), the total duty+VAT bill at bottling would be approximately £6,119. This is payable when the spirit leaves the bonded warehouse.
What is RLA and how is it different from OLA and bulk litres?
Bulk litres is the total volume of liquid in the cask. LPA (Litres of Pure Alcohol) = Bulk Litres × ABV%. OLA (Original Litres of Alcohol) is the LPA when the cask was first filled. RLA (Regauged Litres of Alcohol) is the LPA as measured at a re-gauge after evaporation losses. If you know RLA and ABV, you can calculate bulk litres as: Bulk Litres = RLA ÷ ABV%. Re-gauging is carried out by the warehouse under HMRC-bonded conditions.
Is bottling a whisky cask the best way to exit a cask investment?
For most private cask owners, selling the cask in bond is the more cost-effective exit because it avoids the substantial duty+VAT bill and all bottling costs. Bottling makes most sense if you intend to use the bottles personally, if you have a ready-to-buy customer base, or if the cask contains a highly sought-after spirit where per-bottle retail prices far exceed the total bottling cost price. Independent bottlers, auction platforms, and direct sale to collectors are common in-bond exit routes. This calculator helps you model both scenarios.
Why should I not just divide the cask price by the bottle count to assess fair value?
Dividing the cask price by total bottles gives a misleadingly low per-bottle figure because it ignores: UK spirits duty + VAT (often £40+ per LPA), bottling fees (~£5–8/bottle), dry goods (glass, closure, label; ~£3–7/bottle), cask transport (~£600–900), and accumulated storage and insurance. The true all-in cost per bottle can be 40–70% higher than the simple division suggests. This is one of the most common ways investors unknowingly overpay for a cask.
This tool is for estimation and planning purposes only. Duty rates, VAT, bottling costs, and cask prices are subject to change. Results are not a guarantee of investment returns. Whisky cask investment is an unregulated activity in the UK; past appreciation is not indicative of future results. This is not financial, legal, or investment advice. Always verify duty rates with HMRC and consult a qualified professional before making investment decisions. Source: HMRC Alcohol Duty Rates; Scotch Whisky Regulations 2009.