Quick Answer
One US fluid ounce (US fl oz) is about 29.57ml, so 16oz ≈ 473ml and 22oz ≈ 651ml; an imperial fluid ounce is about 28.41ml, and the fluid ounce for US nutrition labeling is defined as 30ml. The “500ml” and “700ml” cups common in bubble tea are trade names, and the actual brim capacity and how much drink a cup holds depend on the cup’s specifications. Recipe dosages should be based on how much drink and ice actually go in; for example, Tang Sugar’s fruit syrup dosage chart has separate figures for 500ml and 700ml cups.
Ounce to ml Conversion Chart
According to English Wikipedia’s “Fluid ounce”: 1 US fluid ounce = 29.5735295625ml.
| Cup size | Conversion (US, rounded) |
|---|---|
| 12oz | About 355ml |
| 16oz | About 473ml |
| 20oz | About 591ml |
| 22oz | About 651ml |
| 24oz | About 710ml |
| Unit | Milliliters |
|---|---|
| US fluid ounce | 29.5735295625 |
| Imperial fluid ounce | 28.4130625 |
| US nutrition labeling fluid ounce | 30 |
Why a “500ml” Cup Isn’t Always 500ml
- A cup’s stated capacity is often its brim capacity; the actual drink leaves headspace.
- Ice takes up volume; less ice or no ice changes how much drink fits.
- Toppings (tapioca pearls, nata de coco and so on) take up volume too.
So define each cup size by its actual recipe: how many ml of tea, how many grams of syrup and how much ice.
Adjust Recipes by Cup Size
Using Tang Sugar’s fruit syrup dosage chart as an example:
| Cup | Tea | Syrup (full sweetness) |
|---|---|---|
| 500ml | 150ml | 60g |
| 700ml | 200ml | 80g |
A large cup isn’t simply “×1.4”, because the ice ratio differs. For full dosages, see the Fruit Syrup Dosage Guide.
Notes for Overseas Stores
Markets such as the US and Canada usually label cups in ounces; chains that must show calories or caffeine need to convert per-cup servings under local rules. For Taiwan’s rules, see Taiwan’s Bubble Tea Labeling Rules.
Tang Sugar’s Cup Sizes
Tang Sugar supplies 16oz and 22oz clear cold cups, U-shape cups and hard cups, plus flat and dome lids for 16–22oz cups. See PP vs PET Cups.
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FAQ
How many ml is 16oz?
Using the US fluid ounce (about 29.57ml), 16oz is about 473ml.
How many ml is 22oz?
About 651ml (US).
Is a 500ml bubble tea cup really 500ml?
“500ml” is a trade name for the cup size; actual capacity and drink volume depend on the cup, ice and toppings.
Can I scale a recipe up proportionally for a larger cup?
Not recommended. Ice ratios and tea volumes differ, so test real recipes; for example, Tang Sugar’s chart uses 150ml of tea for 500ml cups and 200ml for 700ml.
What size is a standard bubble tea cup?
Common sizes are 16oz (about 473ml) and 22oz (about 651ml) in ounce markets, and “500ml” and “700ml” cups in Taiwan; check each cup’s specifications for actual capacity.
Further Reading
Sources
- Wikipedia: Fluid ounce
- Tang Sugar product data: Lemon Syrup product page (drink preparation steps)
- Tang Sugar product list (March 2026 edition)
