Tool
Bottle size converter
Every format from Piccolo to Nebuchadnezzar, converted between each other — including the two different sizes both called Jeroboam.
Result
1 × Magnum = 2 × Standard bottle
Total volume: 1500 ml (1.5 litres)In standard bottles: 2Glasses at 175 ml: 8
How this was worked out
Formula
quantity in target format = (source volume × quantity) ÷ target volume
Where
- V₁ = 1500 ml — Magnum volume. Two bottles, and the only large format most people ever meet. Widely said to age more slowly — see the note on large-format ageing, which separates the plausible mechanism from what has actually been demonstrated.
- V₂ = 750 ml — Standard bottle volume. The reference format almost everywhere.
- n = 1 — Quantity. How many bottles of the source format.
Steps
- Total volume: 1500 ml × 1 = 1500 ml = 1500 ml
- Convert: 1500 ml ÷ 750 ml = 2 = 2 Standard bottle
What this assumes
- Uses nominal stated capacities. Actual fill varies slightly within legal tolerance.
Where it stops being reliable
- Large-format names are not standardised. A Jeroboam is 3 litres for sparkling wine and 4.5 litres in Bordeaux, which is a genuine and long-standing inconsistency rather than an error here.
| Name | Volume | Standard bottles | Used for | Notes |
|---|---|---|---|---|
| Piccolo / Split | 187.5 ml | 0.25 | Sparkling wine, mostly Prosecco and Champagne | A quarter bottle, roughly one generous glass. Common for single-serve sparkling wine. |
| Demi / Half bottle | 375 ml | 0.5 | Everywhere, and especially sweet wine | Half a standard bottle. Widely used for dessert wine, where a full bottle is more than most tables want. It also develops faster than a standard bottle, which is the least contested part of the format-and-ageing argument. |
| Clavelin | 620 ml | 0.83 | Vin Jaune from the Jura, and nothing else | Legally reserved for Vin Jaune. The size reflects what remains of a litre after six years of evaporation in barrel. |
| Standard bottle | 750 ml | 1 | Everywhere | The reference format almost everywhere. |
| Litre | 1000 ml | 1.33 | Austrian and German everyday wine, often in returnable bottles | A third more than a standard bottle, and a format associated with wine sold to be drunk rather than kept. |
| Magnum | 1500 ml | 2 | Everywhere, and the one large format that is genuinely common | Two bottles, and the only large format most people ever meet. Widely said to age more slowly — see the note on large-format ageing, which separates the plausible mechanism from what has actually been demonstrated. |
| Jeroboam (sparkling) | 3000 ml | 4 | Champagne and Burgundy | Four bottles. The Bordeaux still-wine Jeroboam is a different size entirely — large-format names are not standardised, and this is the pair that catches people out. |
| Jeroboam (Bordeaux) | 4500 ml | 6 | Bordeaux still wine | Six bottles — half as much again as the Champagne Jeroboam of the same name. A genuine and persistent inconsistency rather than an error here. |
| Rehoboam | 4500 ml | 6 | Champagne and Burgundy | Six bottles. The same volume as a Bordeaux Jeroboam under a different name, which is the inconsistency seen from the other side. |
| Methuselah / Imperial | 6000 ml | 8 | Methuselah in Champagne and Burgundy; Imperial in Bordeaux | Eight bottles. One volume, two names, decided by where the wine came from. |
| Salmanazar | 9000 ml | 12 | Champagne mostly | Twelve bottles — a full case in one vessel. |
| Balthazar | 12000 ml | 16 | Champagne mostly | Sixteen bottles, and around 20 kg full. Effectively a display object. |
| Nebuchadnezzar | 15000 ml | 20 | Champagne mostly | Twenty bottles, and around 25 kg full. It takes two people to pour. |
Do magnums really age more slowly?
- The mechanism
- Oxygen reaches wine through the closure and from the headspace in the neck. A magnum has much the same neck as a standard bottle but twice the wine, so there is less oxygen per unit of wine.
- What has actually been shown
- Plausible and widely repeated rather than well demonstrated. Controlled comparisons of one wine across formats over decades are rare, and most of what supports the claim is accumulated trade observation.
- The clearer case
- The small formats are the less contested direction: a half bottle has a similar neck for half the wine, so it develops faster. That is easier to observe because it happens over years rather than decades.
- Where WineHQ lands
- Worth knowing, not worth a large premium on ageing grounds alone. The better arguments for a magnum are that it serves six people and that it looks like an occasion.
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