Ounces to ml Converter: Convert Fluid Ounces to Milliliters
Convert liquid volume in US fluid ounces (fl oz) to milliliters (ml) with exact NIST standards.
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How to Use the Ounces to ml Converter (US Fluid Ounces to ml)
- 1Type the fluid volume in fluid ounces (fl oz) into the jigger calculator.
- 2Select your needed decimal resolution (2 to 8 places).
- 3Read the converted volume in metric milliliters (ml) with complete floating-point accuracy.
- 4Consult the beverage reference chart below comparing American fluid ounces against British Imperial pints.
Formula & How It Works
US Fluid Ounce NIST Formula
Based on 1 US fluid ounce = 1/128 US gallon = 29.5735295625 ml (exact). Source: NIST SP 811.
Worked Examples
Standard Bartender Cocktail Jigger (1.5 fl oz)
Input: 1.5 fl oz
Explanation: 1.5 × 29.5735295625 = 44.36029... ml standard liquor pour.
Large Insulated Gym Water Flask (32 fl oz)
Input: 32 fl oz
Explanation: 32 × 29.5735295625 = 946.3529 ml (almost 1 full liter).
Pediatric Infant Nursing Bottle (4 fl oz)
Input: 4 fl oz
Explanation: 4 × 29.5735295625 = 118.2941 ml baby formula.
Frequently Asked Questions
How many ml are in a standard 1.5 oz bar jigger?▼
A standard 1.5 US fluid ounce cocktail jigger contains approximately 44.36 milliliters.
Does 1 fluid ounce of liquid weigh 1 ounce on a scale?▼
Only for pure room-temperature water is 1 fl oz (~29.57 ml) close to 1 ounce weight (~28.35 g); denser liquids like honey or alcohol differ.
How many ml are in a 32 oz insulated water bottle?▼
A 32 fl oz water bottle holds approximately 946.35 ml (just shy of 1 metric liter).
What is the difference between US fl oz and British Imperial fl oz?▼
A US fluid ounce equals 29.5735 ml, while a British Imperial fluid ounce equals 28.4131 ml (about 4% smaller).
Why do beverage cans in the US state 355 ml for 12 fl oz?▼
12 fluid ounces multiplied by 29.5735 equals 354.88 ml, which packaging manufacturers round to 355 ml.
How many ml are in an 8 fl oz cup?▼
An 8 fluid ounce cup equals exactly 236.588 ml.
Quick Reference & Conversion Table
| Fluid Ounces (fl oz) | US Volume (ml) | Imperial UK Volume (ml) | Beverage / Bar Standard |
|---|---|---|---|
| 0.75 fl oz (pony shot) | 22.180 ml | 21.310 ml | Pony bar jigger |
| 1.5 fl oz (jigger) | 44.360 ml | 42.620 ml | Standard shot pour |
| 2 fl oz (double) | 59.147 ml | 56.826 ml | Double shot pour |
| 6 fl oz | 177.441 ml | 170.479 ml | Small coffee cup |
| 12 fl oz (can) | 354.882 ml | 340.957 ml | Aluminum soda can |
| 16 fl oz (pint glass) | 473.176 ml | 454.609 ml | US craft beer pint |
| 20 fl oz (tall bottle) | 591.471 ml | 568.261 ml | Sports drink bottle |
| 32 fl oz (flask) | 946.353 ml | 909.218 ml | Insulated hydro flask |
⚠️ Common Pitfalls to Avoid
- •Confusing fluid ounces (volume: fl oz) with avoirdupois dry weight ounces (mass: 1 oz = 28.3495 grams).
- •Assuming British Imperial fluid ounces are identical (1 UK fl oz is slightly smaller at 28.413 ml).
- •Assuming liquor shot glasses always equal 1 fl oz (most commercial bars pour 1.5 fl oz jiggers).
💡 Practical Real-World Uses
- •Mixing craft cocktails requiring precision spirits, liqueurs, and citrus bitters.
- •Tracking daily water hydration goals with marked 24 oz or 32 oz reusable bottles.
- •Preparing accurately diluted infant formula powders in pediatric nursing bottles.
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