Fluid Ounces to Milliliters
Convert fluid ounces to ml, cups, and liters. 1 US fl oz = 29.5735 ml. For cooking and beverages.
Enter your values above to see the results.
Tips & Notes
- ✓1 US fl oz = 29.5735 ml exactly. The UK imperial fl oz = 28.4131 ml — about 4% smaller. US and UK fluid ounces differ.
- ✓Beverage sizing: a standard US shot = 1.5 fl oz = 44.36 ml. A 12 fl oz can of beer = 354.88 ml. A 20 fl oz drink = 591.47 ml.
- ✓Medication: oral liquid medicines often dose in ml. If a label says 1 fl oz, that is 29.57 ml — verify with US fl oz.
- ✓Perfume and cosmetics: bottles labeled in fl oz (US) can be converted to ml for comparison with international products.
Common Mistakes
- ✗Using the UK fl oz (28.41 ml) instead of the US fl oz (29.57 ml) when working with US recipes or products — a 4% error.
- ✗Confusing fluid ounces (volume) with weight ounces (mass) — 1 fl oz of water ≈ 29.57 ml ≈ 29.57 g, but 1 fl oz of oil ≠ 1 oz by weight.
- ✗Using 30 ml as 1 fl oz — a 1.4% overestimate. For most cooking this is fine, but medication dosing requires the precise 29.5735 ml.
- ✗Assuming fl oz on a US product and a UK product are the same — US fl oz is 29.57 ml; UK fl oz is 28.41 ml.
Fluid Ounces to Milliliters Overview
What This Calculator Does
Converts US fluid ounces to milliliters using the exact defined value: 1 US fluid ounce = 29.5735295625 ml.
The Formula
ml = fl oz × 29.5735
US vs UK Fluid Ounce
| Fluid Ounce | Milliliters | Used In | |-------------|-------------|---------| | US fluid ounce | 29.5735 ml | United States | | UK imperial fluid ounce | 28.4131 ml | United Kingdom |
The two fluid ounces differ by about 4.1%. Both are in common use, so always check which is being used on product labels.
Common Beverage Sizes
| Fluid Ounces | Milliliters | Beverage Context | |-------------|-------------|-----------------| | 1.5 fl oz | 44.36 ml | Standard shot | | 8 fl oz | 236.6 ml | 1 US cup | | 12 fl oz | 354.9 ml | Standard can | | 16 fl oz | 473.2 ml | 1 pint / large cup | | 20 fl oz | 591.5 ml | Large fountain drink | | 33.8 fl oz | 1,000 ml | 1 liter bottle |
How Fluid Ounces Relate to Other US Units
The US liquid measurement system is built on the gallon:
- 1 gallon = 128 fl oz = 3,785.41 ml
- 1 quart = 32 fl oz = 946.35 ml
- 1 pint = 16 fl oz = 473.18 ml
- 1 cup = 8 fl oz = 236.59 ml
- 1 tablespoon = 0.5 fl oz = 14.79 ml
- 1 teaspoon = 1/6 fl oz = 4.93 ml
Fluid Ounces in Everyday Products
Beverages, cosmetics, personal care products, and liquid medications in the US are labeled in fluid ounces. A 3.4 fl oz travel-size container = 100.5 ml (just over the TSA 100 ml limit). A 16 fl oz shampoo bottle = 473 ml. Medications are dosed in ml for precision but bottles may label in fl oz.