Paper Cold Cup 12oz: Capacity, Coating and the 355ml Argument
A buyer in Dallas sent us two cups last August and asked which was the 12oz. Both said 12oz on the carton. Both took a 90mm lid. One held 355ml to the brim, the other 340ml, and the difference showed up on her fountain machine as a quarter-inch of air at the soda line. She had already signed off on 120,000 pieces. The number on the box describes a nominal size, not what your customer pours.
What “12oz” Is Measuring
US cups sell by fluid ounce, and 12 US fl oz is 354.9ml. European suppliers work in ml and call the same family 350ml or 360ml. Then comes the base: 90mm is the standard rim in the US and much of Europe, but bases run 55mm, 57mm and 58mm across factories, and the base decides where the fill line sits.
Our floor rule: capacity is measured to a defined headspace, not to the rim. A 12oz fountain cup should hold 355ml with 10–15mm left for ice and foam, landing most moulds at 380–400ml brim-full. If a supplier quotes “355ml” and means brim-full, your real pour is nearer 320ml. Ask for both in writing.
Coatings: PE, Water-Based, and What Each Costs You
Cold cups need an inner barrier or the paper goes soft in twenty minutes. Three options dominate.
PE, single side. The default. Reliable for iced drinks, cheap, recyclability varies by mill. We run 15–18 gsm on the inner wall for cold cups. Not compostable, which matters in strict packaging markets.
PE both sides. Common where condensation is heavy or vending cycles are long. Adds 1–2 cents per piece and slows repulping.
Water-based and dispersion coatings. What buyers ask about when they need a compostable claim. Performance on cold drinks is good — iced coffee for eight hours without wicking — but cost is 20–35% above PE at the same grammage, and the certificate must cover the finished article, not the coating supplier’s sheet. Our notes on compostable cold cups cover which certificates apply to a cup with a printed seam.
Caveat: water-based coatings are more sensitive to seam glue and storage humidity. We have seen seam failures where coating and glue came from different suppliers with no compatibility check.
Cup Body Weight: Where Cheap Cups Die
Body board for a 12oz cold cup runs 260–300 gsm; the bottom disc 280–320 gsm because it takes the load. Below 250 gsm a cup survives a soft drink but collapses when gripped with ice in it. Four weights, one mould:
| Board (gsm) | Fill at brim | Grip test with ice | Suitable use | Rough FOB band (USD/1,000) |
|---|---|---|---|---|
| 240 | 340ml | Deforms at ~35N | Water, short events | 28–34 |
| 260 | 355ml | Holds, slight oval | Standard fountain | 33–40 |
| 280 | 365ml | Holds | Iced coffee, thick drinks | 38–46 |
| 300 | 375ml | Holds firmly | Catering, reusable-lid programs | 43–52 |
Those bands are FOB Qingdao for plain white cups at 100,000+ pieces; print adds 8–15%, freight excluded. Use them to sanity-check a quote — pulp and coating costs move quarterly.
US and European Spec Differences
Same nominal size, different demands. Mixing specs is the top cause of rejected samples.
United States. 90mm rim, designed around fountain dispensers and standard lid stacks. Buyers care about lid retention and stack height because dispensers are set for a specific tube length.
Europe. Comparable rim, heavier paperwork. A compostable claim needs EN 13432 evidence on the finished cup, and single-use cup rules in several member states push toward reuse schemes or levies. Water-based demand is far higher than in the US.
United Kingdom. Similar geometry, but buyers increasingly want a fibre lid and a paper straw fit check after the plastic straw rules.
Selling into several markets? Spec the cup once at 280 gsm with a 90mm rim and vary only coating and print. Two bodies is manageable; four bodies is a warehouse problem.
MOQ, Cartons and Container Math
A 12oz single-wall cup nests hard. In our export carton, 1,000 pieces take roughly 0.055–0.065 m³. A 40HQ holds 1,000–1,200 cartons by volume — a million cups at the low end — but weight often trips first, so plan by carton count.
MOQ on stock sizes is 50,000–100,000 pieces per print. Below that we run your artwork on a shared plate, or you pay a few hundred dollars in plate and setup. Custom print MOQ is 100,000 per design on most 12oz moulds.
One Thing We Got Wrong
In 2023 a Canadian juice chain got 12oz cups with a 280 gsm base and a 250 gsm wall. Physically fine, commercially not: staff stacked cups above the counter collar and the lighter wall ovalised. Complaints said “wobbly”, not “leaking”. We now keep wall and base within 40 gsm on all cold cup SKUs; about half a cent per cup.
If you need plates and cutlery to travel with the cups, our bagasse tableware range shares the container and saves on LCL. Buyers building drinks-plus-food kits usually want a bag next; the kraft gift bag notes cover paper weight and handle load.
FAQ
Is a 12oz paper cup 350ml or 355ml?
Effectively 355ml. 12 US fl oz is 354.9ml, and many European factories round to 350ml. What matters is fill capacity at your headspace; ask for brim-full and fill-line figures separately.
What is the standard rim diameter for a 12oz cold cup?
90mm across the rim is the common standard in the US and much of Europe, which is why 90mm lids fit across brands. Base diameter is not standardised and varies 55–58mm.
Can a 12oz cold cup be compostable?
Yes, with a water-based or dispersion coating and certification on the finished cup. PE-lined cups are not compostable. Confirm the certificate names the finished product.
How many 12oz cups fit in a 40ft container?
Roughly 1.0–1.2 million single-wall pieces, depending on board weight and packing. Weight limits often bind before volume, so confirm carton count and gross weight per pallet.
What is the MOQ for printed 12oz cold cups?
Typically 100,000 pieces per design for custom print, with a one-time plate charge. Stock white cups can go to 50,000; shared-plate runs sometimes lower.
Do 12oz cold cup lids fit hot cups?
No. Cold cup lids are usually flat or dome with a straw slot; hot lids are sip-lids for a different rim profile. Check fit on your own cup, not on a spec sheet.
Send your fill volume, lid type and destination port and we will come back with two or three cup specs that hit it, fill-line number stated plainly. Start a quote request.
