Read the whole label
Look for mL, L, US fl oz or Imperial fl oz. If the label says only oz, check the manufacturer's specifications rather than guessing.
mL to Fluid Ounces Converter: US vs Imperial Bottle Sizes
Your bottle says ounces.
Which ounces?
A 500 mL bottle holds about 16.91 US fluid ounces—or 17.60 Imperial fluid ounces. Check the unit before saving a bottle size.
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EXPLORE THE RESULT
500.00 mL
500 mL ÷ 29.5735295625 ≈ 16.91 US fl oz. The same 500 mL ÷ 28.4130625 ≈ 17.60 Imperial fl oz. The bottle has not changed—only the unit has.
Measure your usual cup pour
Use the same mug and a measuring jug marked in mL. Fill the mug to your usual line, transfer the water to the jug and read the volume. Empty the jug before each of the next two pours. You can reuse the water.
The note describes what this cup held in three trials. For an unfinished drink, record only the portion consumed. The sheet gives no daily intake target.
Volume is not weight
Fluid ounces measure volume. Ounces used for weight are different. This converter does not turn a liquid's weight into its volume.
Save the useful precision
The display rounds to two decimals for ounces and mL, and three for litres. Bottle markings and real fills may be less precise than the arithmetic.
FOR RESOURCE EDITORS
Put the bottle calculation beside your own worksheet.
This optional compact companion converts the volume consumed from a labelled bottle in mL, litres, US fluid ounces or Imperial fluid ounces. Choose whether a fraction describes what you drank or what remains. It is useful when a desk checklist or bottle log needs an amount in a different unit.
For example, if one quarter of a 20 US fl oz bottle is left, choose “What is left” and enter 1 of 4 parts. The widget shows about 443.60 mL consumed and 147.87 mL remaining. The same number of Imperial fluid ounces describes a different bottle. This is volume arithmetic, not a recommended drinking amount.
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If your site blocks iframes, use the ordinary converter link. Embedding creates a request to this host; standard hosting logs may apply. No third-party tracking or analytics scripts are included in the compact converter. No partner placement or adoption is claimed.
Dropkin: Water Reminder
Save the bottle once. Log it with a tap.
Dropkin lets you save a bottle, glass or mug and log a whole, half or quarter portion. It supports ounces and metric units, editable history and reminders you control.
Explore Dropkin on the App Store ↗The core tracker is free, with optional Pro features. This converter measures volume; it does not recommend how much to drink or transfer a bottle into Dropkin.
App details checked against the official App Store listing on November 4, 2026. Check current availability and purchase terms there.
Questions before you continue
How many US ounces are in 750 mL?
About 25.36 US fluid ounces. In Imperial fluid ounces, 750 mL is about 26.40.
Is one litre always 1,000 mL?
Yes. That metric relationship is exact.
Does the illustration show a daily goal?
No. Its 1,000 mL scale is just a reference for comparing bottle volumes.
Reference notes
Background references for the definitions or approach used above:
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