Paper Cup Sizes: Conversion Table from 4 oz to 20 oz in ml
- 1 fl oz corresponds to roughly 29.6 ml – the oz designation is a size category, not an exact liquid measurement.
- The most commonly used sizes in cafés are 8 oz, 12 oz, and 16 oz.
- Lids fit by rim diameter, not by ounce rating – always order them together.
Paper cups are internationally specified in fluid ounces (oz). However, for customers and drink costing, volume in millilitres is what counts. Because manufacturers distinguish between brimful capacity and nominal capacity, values vary slightly. The following table illustrates standard industry sizing.
Size Chart: oz to ml
| Size | Approx. Capacity | Typical Beverages |
|---|---|---|
| 4 oz | 100–120 ml | Espresso, tastings, samples |
| 8 oz | 200–240 ml | Cappuccino, flat white, small tea |
| 10 oz | 280–300 ml | Large cappuccino, hot chocolate |
| 12 oz | 300–360 ml | Latte macchiato, tea – standard size |
| 16 oz | 400–480 ml | Large milk-based drinks, chai, iced coffee |
| 20 oz | 500–600 ml | XL beverages, cold drinks |
How Many Sizes Does a Café Need?
Three sizes cover the vast majority of orders for most businesses: small (8 oz), medium (12 oz), and large (16 oz). A 4 oz cup is worthwhile if you sell significant espresso volumes or offer sampling. Every additional size ties up storage space and capital – and with custom-printed cups, minimum order quantities apply per size.
Key Considerations When Choosing Sizes
- Select and test lids according to diameter (e.g. 80 mm, 90 mm)
- Calculate fill level comfortably below the rim to leave room for milk froth
- Factor in double-walled cups or sleeves for hot drinks
- Align price lists and menu boards with true drink serving volumes
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