Fluid Ounce (US) to Milliliter

1 US fluid ounce = exactly 29.57 ml (29.5735295625 ml to be precise). The UK (imperial) fluid ounce is slightly smaller at 28.41 ml. Most recipes, medicine labels, and beverage sizes from the US use the US fluid ounce. To convert any number of ounces to ml, multiply by 29.57.

8 US fluid ounces = 236.59 ml. This equals exactly 1 US cup — the standard coffee mug size and the basic recipe unit in American cooking. An 8 oz / 236 ml bottle is the typical single-serve water bottle sold worldwide. UK: 8 imperial oz = 227.3 ml.

1.5 US fluid ounces = 44.36 ml. This is the standard jigger pour for spirits in the US — a single cocktail measure. Bartending guides call for 1.5 oz as the base spirit in most classic cocktail recipes (margarita, daiquiri, whiskey sour). In Southeast Asia a standard spirit pour is typically 30 ml or 45 ml, so 1.5 oz sits between those two measures.

No — they differ by about 4%. A US fluid ounce = 29.57 ml; a UK (imperial) fluid ounce = 28.41 ml. Medicine bottles and cosmetics sold in the UK use imperial fl oz, while US products use US fl oz. For medicine dosing this matters: if an American prescription says 'take 1 fl oz', that is 29.57 ml; the UK equivalent would be 28.41 ml. Always check the country of origin on medicine and health product labels.

16 US fluid ounces = 473.18 ml, which equals exactly 1 US pint. This is the most common US water bottle size sold at convenience stores, gyms, and vending machines. A Starbucks Grande (16 oz / 473 ml) and a standard US beer can (16 oz) are the same volume. UK: 16 imperial fl oz = 454.6 ml (1 UK pint). Sports and gym culture worldwide now uses the 500 ml bottle, the metric near-equivalent of the 16 oz US bottle.

3.4 US fluid ounces = 100.55 ml — effectively 100 ml. This measurement is best known from the TSA 3-1-1 carry-on rule: each liquid, gel, or aerosol in carry-on luggage must be in a container of 3.4 oz (100 ml) or less. Travel-size shampoo, conditioner, sunscreen, and toothpaste are sold in 3.4 oz / 100 ml containers for exactly this reason. The EU equivalent rule is 100 ml per container.

2 US fluid ounces = 59.15 ml (approx. 60 ml). Perfume and cologne bottles are commonly sold in 2 oz (60 ml) or 1.7 oz (50 ml) sizes — both are the standard travel and gift sizes at duty-free shops. Baby formula feeding guides often call for 2 oz (60 ml) portions for newborns. A standard shot glass holds 1.5-2 oz (44-59 ml). For skincare, a 2 oz / 60 ml bottle is one of the most common face-cream or serum sizes.

Multiply ounces by 30 for a fast, close estimate: 1 oz x 30 = 30 ml (actual 29.57 ml, just 1.5% off). This is the bartender's standard — '1 oz = 30 ml' is used across cocktail bars worldwide. Quick examples: 2 oz ~ 60 ml, 4 oz ~ 120 ml, 8 oz ~ 240 ml, 16 oz ~ 480 ml. For medicine, dosing, or precise recipes, use the exact factor 29.5735 ml per US fl oz.