Last updated: September 16, 2026
Quick answer: Divide milliliters by 29.574 to get US fluid ounces. 1 fl oz = 29.574 mL. So 100 mL ≈ 3.38 fl oz, 250 mL ≈ 8.45 fl oz, and 500 mL ≈ 16.91 fl oz.
Milliliter to Fluid ounce (US)
Instantly convert milliliter to fluid ounce (us) with fast, accurate, real-time results.
Milliliters and fluid ounces appear on the same product label in almost every country — the US fl oz on the front, the mL figure in smaller text below or on the back. Knowing how to go between them helps with drink sizing, carry-on liquid limits, and reading imported food or cosmetics labels. For the reverse, see the fluid ounces to mL converter.
Formula: mL to Fluid Ounces
The US customary fluid ounce is defined as 1/128 of a US gallon, which works out to exactly 29.5735295625 mL:
A handy mental shortcut: divide by 30. It's within 1.4% of the exact answer and fast enough for grocery shopping or airport security lines. For the exact reverse, multiply fl oz × 29.574 to get mL.
Drink and Bottle Sizes
Standard US drink sizes are defined in fluid ounces; most imported beverages and craft spirits label in mL. Here's how they map:
Beverages and cans
| Container | US fl oz | mL |
|---|---|---|
| Shot (single) | 1.5 fl oz | 44.4 mL |
| Espresso (single) | 1 fl oz | 29.6 mL |
| Small juice box | 6 fl oz | 177 mL |
| Standard soda can | 12 fl oz | 355 mL |
| Tall can (craft beer) | 16 fl oz | 473 mL |
| Standard water bottle | 16.9 fl oz | 500 mL |
| Sports bottle | 20 fl oz | 591 mL |
| Large water bottle | 33.8 fl oz | 1,000 mL (1 L) |
Spirits and wine bottles
| Bottle name | mL | US fl oz |
|---|---|---|
| Miniature (nip) | 50 mL | 1.69 fl oz |
| Half-pint (flask) | 200 mL | 6.76 fl oz |
| Pint | 375 mL | 12.68 fl oz |
| Standard (fifth) | 750 mL | 25.36 fl oz |
| Liter | 1,000 mL | 33.81 fl oz |
| Handle (half-gallon) | 1,750 mL | 59.17 fl oz |
Skincare and Cosmetics Bottle Guide
TSA carry-on rules allow containers of 3.4 fl oz (100 mL) or less. Cosmetics and skincare products label in both units, though travel-size products sometimes only show one. Common sizes:
| Product type | Common mL size | fl oz equivalent | TSA compliant? |
|---|---|---|---|
| Travel shampoo | 60 mL | 2.03 fl oz | Yes |
| Serum | 30 mL | 1.01 fl oz | Yes |
| Moisturizer (travel) | 50 mL | 1.69 fl oz | Yes |
| Moisturizer (full) | 100 mL | 3.38 fl oz | Yes (exactly at limit) |
| Toner | 150 mL | 5.07 fl oz | No — check in bag |
| Shampoo (full-size) | 355 mL | 12 fl oz | No |
| Body lotion (full-size) | 473 mL | 16 fl oz | No |
Cooking and Recipe Amounts
American recipes use fluid ounces; imported and metric recipes use mL. Small cooking amounts and their equivalents:
| mL | fl oz | Kitchen equivalent |
|---|---|---|
| 5 mL | 0.17 fl oz | 1 teaspoon |
| 15 mL | 0.51 fl oz | 1 tablespoon |
| 30 mL | 1 fl oz | 2 tablespoons |
| 60 mL | 2 fl oz | ¼ cup |
| 120 mL | 4 fl oz | ½ cup |
| 240 mL | 8 fl oz | 1 cup |
| 480 mL | 16 fl oz | 1 pint |
| 960 mL | 32 fl oz | 1 quart |
For larger recipe amounts, the mL to cups converter is often more practical. For tablespoons and teaspoons, see the teaspoons to tablespoons converter.
Full mL to fl oz Table
| mL | fl oz | mL | fl oz | mL | fl oz |
|---|---|---|---|---|---|
| 1 mL | 0.034 | 50 mL | 1.690 | 300 mL | 10.144 |
| 5 mL | 0.169 | 60 mL | 2.029 | 350 mL | 11.834 |
| 10 mL | 0.338 | 75 mL | 2.536 | 400 mL | 13.526 |
| 15 mL | 0.507 | 100 mL | 3.381 | 473 mL | 16.000 |
| 20 mL | 0.676 | 125 mL | 4.227 | 500 mL | 16.907 |
| 25 mL | 0.845 | 150 mL | 5.072 | 750 mL | 25.361 |
| 30 mL | 1.014 | 200 mL | 6.763 | 1,000 mL | 33.814 |
| 40 mL | 1.353 | 250 mL | 8.454 | 1,750 mL | 59.175 |
FAQs About mL to Fluid Ounces
How many mL is 1 fluid ounce?
One US fluid ounce = 29.5735 mL. The UK imperial fluid ounce is slightly larger at 28.4131 mL. Unless a label specifies "imperial," assume the US value.
Is 100 mL the same as 3.4 fl oz?
Yes — 100 mL ÷ 29.574 = 3.381 fl oz, which rounds to 3.4 fl oz. This is the TSA carry-on liquid limit: 3.4 fl oz = 100 mL = the maximum size for a single container in your quart-sized bag.
How many fluid ounces in 500 mL?
500 mL ÷ 29.574 = 16.907 fl oz — essentially 17 fl oz, or just over 1 US pint (16 fl oz). A standard 500 mL water bottle is often labeled "16.9 fl oz" using this rounded figure.
Is a fluid ounce the same as a regular ounce?
No. A fluid ounce (fl oz) measures volume; a regular ounce (oz) measures mass (weight). For water, 1 fl oz happens to weigh about 1.04 oz, but for other liquids the mass is different — 1 fl oz of honey weighs about 1.5 oz.
How many mL in 8 fl oz?
8 fl oz × 29.574 = 236.588 mL — which is exactly 1 US cup. This is why 1 cup = 8 fl oz = 236.6 mL all appear on the same measuring cup scale.
Sources
References & further reading
- NIST Handbook 44 — Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices (defines the US fluid ounce as 1/128 US gallon = 29.5735295625 mL)
- Transportation Security Administration — Liquids Rule: 3-1-1 for carry-ons
- Alcohol and Tobacco Tax and Trade Bureau (TTB) — Standard bottle sizes for distilled spirits
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