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Oz to mL Converter
Convert oz to mL or mL to oz instantly. Choose US or Imperial fluid ounces to match your bottle.
Your converted volume
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Change the example inputs to calculate.
See the formula and limitations below.
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Track every glass with AquaJoy ↗Free download · iPhone · No account neededHow to convert oz to mL
Enter the volume, choose the starting unit and choose the unit you want. The result updates as you type. Use “Swap units” to reverse the calculation while keeping the equivalent volume.
mL ≈ US fl oz × 29.57
US fl oz ≈ mL ÷ 29.57
One Imperial fluid ounce is approximately 28 mL. A US cup is eight US fluid ounces, approximately 237 mL. Displayed values are rounded for everyday use; the calculation keeps the precise conversion factors. This converter uses those volume definitions, not a 240 mL nutrition-label cup.
Common water bottle conversions
| US fl oz | mL | L |
|---|---|---|
| 8 | 237 | 0.24 |
| 16 | 473 | 0.47 |
| 16.9 | 500 | 0.50 |
| 32 | 946 | 0.95 |
| 64 | 1,893 | 1.89 |
Fluid ounces are volume, not weight
A fluid ounce measures how much space a liquid takes up. An ounce of weight measures mass. This tool converts fl oz, mL, liters and US cups; it does not convert weight ounces or grams.
The same volume conversion works for water, milk and other liquids. Converting a liquid’s weight to volume would also require its density.
From bottle size to daily habit
Knowing that your bottle holds about 473 mL helps you count what you drink. It does not tell you how much you personally need. Use our daily water intake calculator for a rough starting estimate, then read how to build a hydration habit.
Frequently asked questions
How many mL are in one oz?
One US fluid ounce is approximately 30 mL. One Imperial fluid ounce is approximately 28 mL. Select the correct fluid ounce in the converter.
How many mL is 8 oz?
Eight US fluid ounces is approximately 237 mL. That is also one US measuring cup.
How many mL is a 16 oz water bottle?
A 16 US fl oz bottle holds approximately 473 mL. A 16.9 US fl oz bottle holds approximately 500 mL.
How many mL is 32 oz?
32 US fluid ounces is approximately 946 mL, just under one liter.
How many liters is 64 oz?
64 US fluid ounces is approximately 1.89 liters. It is a volume conversion, not a daily water recommendation.
How many oz is 500 mL?
500 mL is approximately 16.91 US fluid ounces or 17.6 Imperial fluid ounces.
Can I convert mL to oz too?
Yes. Choose mL as the starting unit and US or Imperial fluid ounces as the result unit. You can also use Swap units.
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Sources and method
By Bruno Martins, creator of AquaJoy. Updated October 8, 2026. Informational tool; not a substitute for professional advice.