Which mug size for which drink

Buying a mug online has one awkward problem: 350ml means nothing until you are holding it. This is a translation guide — sizes to drinks, and a trick for measuring the mug you already like so you can buy another one that feels the same.

The sizes, roughly

60–90ml — espresso

A demitasse. Small enough that it looks like a toy next to a normal mug. Only worth owning if you actually pull espresso; otherwise it becomes the cup nobody reaches for.

150–200ml — a proper cup of tea, or 3-in-1

This is the size a classic teacup has always been, and it is almost exactly what a 3-in-1 coffee sachet is designed for. If you drink instant coffee and your mug is much bigger than this, you have been making weak coffee your whole life — the sachet is measured for around 150–180ml.

Also the right size for cappuccino, where the point is the ratio of foam to coffee rather than the volume.

300–350ml — the standard mug

If someone says "a mug" with no other detail, this is it. Brewed coffee, tea with milk, hot chocolate. Big enough that you are not refilling constantly, small enough that the last mouthful is still warm.

If you are unsure, buy this size. It is the one that gets used daily.

400–450ml — the big one

Latte mugs, weekend mugs, the one you take to your desk so you are not up every twenty minutes. The honest trade-off: the bottom third is usually lukewarm by the time you reach it. Worth it if you drink fast, annoying if you sip.

450ml and up — milk tea, soup, cereal

Past about 450ml you are no longer really in mug territory. Useful for milk tea with a lot of ice, instant noodles, or soup. Note that a full mug this size is genuinely heavy — around half a kilo of liquid plus the ceramic — which matters if you hold it while reading.

How to measure the mug you already own

The most useful thing you can do before buying online. Take the mug you reach for every morning and:

1. Fill it to where you would actually stop pouring — not the brim
2. Pour that into a measuring jug, or into a 500ml water bottle you can read
3. That number is your size

No measuring jug? A standard bottled water is 500ml. Fill your mug from a fresh one and see how much is left — if roughly a third remains, your mug is about 330ml.

Watch for the brim gap. Listed capacity is usually measured to the very top, but nobody fills a mug to the very top. A "350ml" mug holds about 300ml in real use. Assume roughly 15% less than the label.

Shape changes things more than you would think

Two mugs of identical capacity can behave completely differently.

• Tall and narrow keeps drinks hot longer — less surface area exposed to the air. Good for slow sippers
• Wide and shallow cools faster and lets the aroma out, which is why proper cappuccino cups are that shape. Bad for anyone who leaves a drink for twenty minutes
• Thick walls take longer to warm up but hold heat far better once they do. This is the real reason a warmed mug matters

The handle is not a detail

It is the part most people regret. Things worth checking before you commit:

• Do two fingers fit? A single-finger handle on a 400ml mug means the weight hangs off one knuckle
• Does it sit away from the body? A handle flush against a hot mug transmits heat to your fingers
• Is it thick where it joins? That join is where handles snap, usually while full

Quick answers

• 3-in-1 coffee: 150–200ml
• Tea with milk: 250–350ml
• Brewed coffee: 300–350ml
• Latte or big morning coffee: 400–450ml
• Milk tea or soup: 450ml+
• Buying a gift and unsure: 330ml. It is nobody's wrong answer

Every mug we stock lists its capacity on its own page, so once you know your number you can just match it.