Cup volume calculator: oz to ml

Convert cup sizes between US fluid ounces and millilitres, work out the volume of a cup you are holding from its dimensions, and see which of our cups and lids it matches.

US fluid ounces (oz) Millilitres (ml)

1 US fluid ounce = 29.5735 ml. Cup sizes are named in US fluid ounces, not imperial ounces.

Why the ounce and the millilitre never quite line up

One US fluid ounce is 29.5735 millilitres, so eight of them come to 236.6 ml. Yet almost every supplier in the world sells that cup as a 240 ml cup, and a 12 oz cup is offered as 350 ml rather than 354.9 ml. Neither figure is wrong. The ounce name is a trade size that has been rounded to a sensible serving, while the millilitre figure on a specification sheet is the volume the cup is intended to be filled to. The calculator above shows you both columns side by side so you can see exactly where the difference comes from instead of guessing.

Fill capacity is not the same as brim-full volume

Pour water into a cup until it reaches the rim and you will always get more than the number printed on the case. A cup has to leave room for a lid, for foam on a cappuccino and for a hand that is carrying it across a room. Manufacturers therefore quote the fill capacity, measured to a fill line a little below the rim. When you enter outside measurements into the second tab, the tool returns the geometric brim-full volume of a truncated cone — a clean upper bound. It is the honest number for what you measured, and it will sit above the trade size of the cup you are comparing it with. That gap is normal and it is the reason we match your measurements to our catalogue by dimension rather than by volume.

The rim diameter decides the lid, not the size name

Buyers lose more money on mismatched lids than on almost any other detail. What matters is the diameter across the rim. On our paper lids, the 12 oz size sits on an 80 mm rim while the 14 oz and 16 oz cups share a 90 mm rim and therefore share a lid. On the clear PET side the picture is even simpler: every one of our PET lids is 95 mm, so a single lid covers the whole cold-drink range from 8 oz to 22 oz. If you are consolidating an order, that one fact usually removes a line item or two from your purchase list. Measure the rim, read the result above, and you will know what fits before you ask us anything.

Choosing a size for the drink you actually serve

Espresso and Turkish-style servings sit at the small end, around 4 oz. A flat white or a filter coffee to go is comfortable at 8 oz, which is why that size dominates café orders. Twelve and fourteen ounces cover the large hot drinks and the iced-coffee range, and sixteen ounces is where milkshakes, smoothies and long cold drinks live. Vending machines are their own case: those cups are dimensioned for the machine's dispenser column rather than for a hand, so if you are buying for vending, tell us the machine and we will confirm the fit.

Ordering the size you settled on, with your own brand on it

Once you know the size, the rest is straightforward. We print single-wall cups in six flexo colours as standard, while double-wall cups run CMYK offset, which lifts the colour limit entirely for photographic artwork. Production, quality control, packing and shipping all happen inside the same company in Turkey, so you are dealing with the people who actually run the line rather than an agent in between. Send us the size, the quantity and your artwork and we will reply with a proforma; freight terms are set by the incoterm you prefer.

Cup size chart: oz to ml

Every figure below is the real specification of a cup we run — not a generic table copied from elsewhere.

Size	Fill capacity	Arithmetic conversion	Rim Ø	Height	Product
4 oz	100 ml	118.3 ml	62 mm	62 mm	Single-wall paper cup 100 ml (4 oz)
6 oz	150 ml	177.4 ml	70 mm	80 mm	Single-wall paper cup 150 ml (6 oz)
7 oz	180 ml	207 ml	72 mm	81 mm	Single-wall paper cup 180 ml (7 oz)
7.5 oz	190 ml	221.8 ml	70 mm	90 mm	Single-wall paper cup 190 ml (7.5 oz)
8 oz	240 ml	236.6 ml	80 mm	87.5 mm	Single-wall paper cup 240 ml (8 oz)
9 oz	250 ml	266.2 ml	80 mm	95 mm	Single-wall paper cup 250 ml (9 oz)
12 oz	350 ml	354.9 ml	80 mm	118 mm	Single-wall paper cup 350 ml (12 oz)
14 oz	400 ml	414 ml	90 mm	110 mm	Single-wall paper cup 400 ml (14 oz)
16 oz	500 ml	473.2 ml	90 mm	137 mm	Single-wall paper cup 500 ml (16 oz)

The two millilitre columns differ on purpose: the trade name rounds to a practical serving size, while the arithmetic column is the exact ounce conversion.

Frequently asked questions

How many ml is an 8 oz cup?

An 8 oz cup holds 240 ml as a fill capacity, which is the figure the trade uses. The strict arithmetic conversion is 236.6 ml, because one US fluid ounce is 29.5735 ml; suppliers round to 240 ml because that is the volume the cup is designed to be filled to.

For an importer the millilitre figure only means something next to the carton count: the minimum order is three pallets, that is 60 cartons, and a pallet takes 20. On a partial load collected from our factory by your own vehicle or appointed forwarder, 1 or 2 pallets are also possible — the unit price rises as the pallet count drops. Where the carton count is published the threshold converts straight into pieces; the 8 oz single wall runs at 1,000 to 2,000 per carton and the 6 and 7 oz at 3,000. The declaration is made under HS heading 4823.69.

How many ml is a 12 oz cup and a 16 oz cup?

A 12 oz cup is 350 ml and a 16 oz paper cup is 500 ml in our range. The arithmetic conversions are 354.9 ml and 473.2 ml, so the trade figures round upward from the ounce name depending on the cup geometry — always work from the specification sheet rather than from the ounce name.

On the clear side the same name means a different figure: the 12 oz PET is listed at 350 ml and the 16 oz PET at 500 ml, and the whole clear range sits on a 95 mm rim. That is why the quotation is built on millilitres and rim diameter rather than on the ounce name; both are published on every item. Board bodies are declared under HS heading 4823.69 and clear bodies under 3924.10. The carton count moves with the size: the 12 oz single wall board cup packs 2,000 to a carton and the 16 oz 1,000; the minimum order is three pallets, that is 60 cartons. On a partial load collected from our factory by your own vehicle or appointed forwarder, 1 or 2 pallets are also possible — the unit price rises as the pallet count drops.

How do I measure a cup correctly?

Measure the outside of the cup at three points: straight across the rim, straight across the base, and from the base to the top edge. Rim diameter and height are the two that matter for identifying a cup, because they determine both the shape and the lid.

Rim diameter decides the ordering side too: board covers meet only 80 mm and 90 mm, while on the clear range all 12 cup sizes sit at 95 mm, so a single cover item is enough. The measurement of the cup you use today is confirmed in writing during the quotation exchange. Cover and cup travel on one quotation and one loading; the minimum order is three pallets, that is 60 cartons. On a partial load collected from our factory by your own vehicle or appointed forwarder, 1 or 2 pallets are also possible — the unit price rises as the pallet count drops.

Which lid fits which cup?

The rim diameter decides the lid, not the size name. Our paper lid for 12 oz is 80 mm, while 14 oz and 16 oz share a 90 mm rim and take the same lid; every PET lid we make is 95 mm, so one lid covers the whole cold range from 8 oz to 22 oz.

Because the cover item is a stock decision, it also shortens the order list: one 95 mm clear cover family seats nine volumes from 250 ml to 700 ml. Covers are not printed; the logo goes on the body of the cup. Board covers are declared under HS heading 4823.69 and clear covers under 3923.50 or 3924.10.

Why is the calculated volume higher than the cup size?

Because the calculator gives the brim-full volume of the outside dimensions, while the name of a cup refers to its fill capacity. A cup must leave headroom for a lid and for carrying, so the fill line sits below the rim and the printed capacity is always the smaller number.

Both the quotation and the declaration are built on fill capacity: the millilitre figure on the product page and the HS heading — 4823.69 for board, 3924.10 for clear — enter the order file exactly as they stand. The carton count and the minimum order are read off the same page: three pallets, that is 60 cartons, with 20 cartons to a pallet. On a partial load collected from our factory by your own vehicle or appointed forwarder, 1 or 2 pallets are also possible — the unit price rises as the pallet count drops. The delivery term follows the type of load: FCA is the usual arrangement — you send the vehicle, we load at the plant — with EXW on a part load, DAP available on a full truck, and FOB or CIF organised for sea shipments.

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