Rev Mug — Coffee and tea mugs as a product category | revmug.com
Every common vessel class from a 60 ml demitasse to a 500 ml oversized mug, with the serving each one actually suits.
The smallest common vessel is the espresso demitasse at 60 to 90 ml, roughly 2 to 3 fl oz. It is sized for a single or double shot with a little crema room, and anything larger lets the drink cool before you finish it.
Next come the milk-drink cups. The cappuccino cup holds 150 to 180 ml — coincidentally the same 150 ml that drip brewers count as one 'cup' — and the latte mug spans 240 to 350 ml for drinks that are mostly milk.
The standard US coffee mug holds 11 fl oz (325 ml) and suits an 8 to 9 fl oz pour with headspace. The large diner mug holds 15 fl oz (444 ml); pour a 12 fl oz serving into it and you are exactly 80 percent full, with 3 fl oz (89 ml) of spare room.
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Above 444 ml sits the oversized class around 500 ml, about 17 fl oz. It earns its place for long tea sessions and soup, but for coffee it demands a larger dose to stay within the golden-cup ratio of 55 g per litre.
Converting between systems is one division: 1 US fl oz is 29.57 ml, so divide millilitres by 29.57 to get ounces. A 355 ml mug is 12.0 fl oz; a 300 ml mug is 10.1 fl oz.
If a listed capacity looks optimistic, check it with a ruler. In a mug with an 85 mm inner diameter, 300 ml stands about 53 mm deep — and the measuring page shows the two-minute scale method for an exact figure, while the materials page explains what the wall does with that volume.
Further reading