25 mL = 0.845 US fl oz
25 ÷ 29.5735 = 0.8454 US fl oz
Using the selected default volume definition.
💧 Free conversion calculator
mL to Fluid Ounces Converter
Convert milliliters into US fl oz, check the reverse calculation, and learn when each unit standard applies. Built for drink sizes, perfume bottles and liquid product packaging.
Example with default standard
100 mL3.38140227 US fl oz
Change the unit definition or substance in the live tool. The sample is an illustration, not a one-size-fits-all factor.
Instant two-way conversion
mL to Fluid Ounces Calculator
Enter any non-negative number. Choose your measurement standard or density if needed, then convert back and forth. Results update as you type.
Choose the correct unit definition
For US/Imperial measurements, select the variant printed on the original package or recipe. For mass, select a realistic density instead.
Enter your amount
Use a whole number or a decimal. Both 7.5 and 7,5 are accepted.
Read the value and the working
Use the shown equation to check the unit factor and avoid copying a rounded figure into later calculations.
Calculated result · US fl oz3.38140227 US fl oz
Calculation uses the selected definition.
Common values (mL)
Read before using this resultIf a recipe says “oz” without “fl”, check whether it asks for fluid ounces or weight ounces. A 100 mL volume cannot be converted to ounces by weight without a density.
The unit explained
What Does mL to Fluid Ounces Mean?
A fluid ounce (fl oz) measures volume, not mass. One US fluid ounce is exactly about 29.5735 mL; one Imperial fluid ounce is about 28.4131 mL. That is why identical numbers on UK and US liquid labels can mean different volumes.
US beverage labels may round one fluid ounce to 30 mL, while a precise converter uses the defined factor. Liquid ounces are different from ounces of weight, which measure mass.
Common conversion trapIf a recipe says “oz” without “fl”, check whether it asks for fluid ounces or weight ounces. A 100 mL volume cannot be converted to ounces by weight without a density.
Calculation method
mL to Fluid Ounces Formula and Reverse Formula
mL → US fl oz
US fl oz = mL ÷ 29.57352956 mL/US fl oz
Keep the units consistent and avoid rounding the conversion factor in intermediate steps.
US fl oz → mL
US fl oz × 29.57352956 mL/US fl oz = mL
Reverse the multiplication or division to check your answer. Use the identical unit definition on both sides.
Why these unit definitions matter
US beverage labels may round one fluid ounce to 30 mL, while a precise converter uses the defined factor. Liquid ounces are different from ounces of weight, which measure mass.
US fluid ounce: 1 US fl oz corresponds to 29.57352956 mL.
Imperial fluid ounce: 1 imp fl oz corresponds to 28.4130625 mL.
Step-by-step worked calculation
Worked example: Enter 500 mL and divide by 29.57352956 mL per US fl oz. The answer is 16.90701135 US fl oz. To check the calculation, multiply that result by 29.57352956; you return to the original 500 mL, subject only to displayed rounding.
Compare the alternatives: The same 500 mL is 17.59753986 imp fl oz using Imperial fluid ounce. The calculator lets you select the exact intended standard; do not mix two standards in one calculation.
The on-page calculator uses the same stated default factor. Small display differences can occur when values are rounded.
Check the math25 mL example 100 mL example 250 mL example 500 mL example 1,000 mL example
Five mL to Fluid Ounces Worked Examples
These examples cover several common values, including small and large amounts. Each answer follows the same conversion factor and assumptions shown in the equation.
100 mL = 3.381 US fl oz
100 ÷ 29.5735 = 3.3814 US fl oz
Using the selected default volume definition.
250 mL = 8.454 US fl oz
250 ÷ 29.5735 = 8.4535 US fl oz
Using the selected default volume definition.
500 mL = 16.907 US fl oz
500 ÷ 29.5735 = 16.907 US fl oz
Using the selected default volume definition.
1,000 mL = 33.814 US fl oz
1,000 ÷ 29.5735 = 33.814 US fl oz
Using the selected default volume definition.
Reverse example
Take 8.45350568 US fl oz. Applying the reverse equation gives approximately 250 mL. The input is recovered when the same definition and density are used.
Does the ingredient change the result?
No. This is a volume-to-volume unit conversion, so water, milk, oil and honey use the same numerical volume factor.
Reference values
mL to Fluid Ounces Conversion Table (1–1,500 mL)
Browse popular entries below or show every integer from 1 through 1,500 using the interactive chart. The downloadable CSV also includes every value with no missing integers. The table defaults to the first measurement standard; changing that standard updates the interactive results.
| Milliliters | Converted value | Assumptions |
|---|---|---|
| 1 mL | 0.0338140227 US fl oz | Exact selected definition |
| 5 mL | 0.1690701135 US fl oz | Exact selected definition |
| 10 mL | 0.338140227 US fl oz | Exact selected definition |
| 50 mL | 1.69070114 US fl oz | Exact selected definition |
| 100 mL | 3.38140227 US fl oz | Exact selected definition |
| 125 mL | 4.22675284 US fl oz | Exact selected definition |
| 200 mL | 6.76280454 US fl oz | Exact selected definition |
| 240 mL | 8.11536545 US fl oz | Exact selected definition |
| 250 mL | 8.45350568 US fl oz | Exact selected definition |
| 375 mL | 12.68025851 US fl oz | Exact selected definition |
| 400 mL | 13.52560908 US fl oz | Exact selected definition |
| 500 mL | 16.90701135 US fl oz | Exact selected definition |
| 750 mL | 25.36051703 US fl oz | Exact selected definition |
| 1,000 mL | 33.8140227 US fl oz | Exact selected definition |
Popular conversions.
| mL | US fl oz | Assumption |
|---|
Decimals, values above 1,500 and reverse calculations work in the calculator above.
Practical contexts01 02 03 04
When to Use mL to Fluid Ounces
US fluid ounce ≈ 29.57353 mL and Imperial fluid ounce ≈ 28.41306 mL. Neither is an ounce by weight.
Comparing US beverage package sizes with metric bottles
A beverage label may show 355 mL alongside 12 US fl oz. That is a volume comparison, not a conversion into ounces of mass.
Interpreting 3.4 fl oz liquid containers for travel
For a UK recipe, use the Imperial fluid ounce definition, about 28.413 mL, rather than the US value, about 29.574 mL.
Reading perfume and cosmetic package volumes
Travel toiletries sometimes display 100 mL and 3.4 US fl oz. Keep the appropriate liquid quantity and rounding when checking container capacity.
Switching between UK and US liquid measurements
When returning to mL from fluid ounces, multiply by the factor for the selected US or Imperial standard, and avoid mixing standards midway.
What the displayed conversion means
US fluid ounce ≈ 29.57353 mL and Imperial fluid ounce ≈ 28.41306 mL. Neither is an ounce by weight.
How to check measurement accuracy
Confirm whether the source uses a US customary, Imperial, metric or locally defined serving unit. Keep the same standard in the forward and reverse calculation; compare your answer with a calibrated vessel when preparing a real batch. Decimal precision cannot correct the choice of the wrong national standard.
Frequently asked questions
mL to Fluid Ounces: FAQs
Answers use the default calculator standard unless another unit definition is named.
How many fluid ounces are in 100 mL?
100 mL is approximately 3.381 US fl oz.
What is 3.4 US fl oz in mL?
3.4 US fl oz is about 100.55 mL.
Are 30 mL exactly one fluid ounce?
No. 30 mL is a practical rounded kitchen approximation; one US fluid ounce is approximately 29.5735 mL.
Is fl oz the same as oz by weight?
No. Fluid ounces measure volume; avoirdupois ounces measure mass.
What is the UK fluid-ounce difference?
One Imperial fluid ounce contains about 28.4131 mL rather than the US 29.5735 mL.
Editorial transparency
References, Assumptions and Accuracy
This page publishes the factor used and links to independently maintained measurement references. NIST/BIPM define unit relationships; practical density estimates are not presented as precision laboratory data. Ingredient properties, manufacturer packaging and measuring tools can introduce additional uncertainty.
- NIST: Conversion Factors for Volume. Unit definitions, capacity factors and calculation standards.
- NIST: Metric Kitchen Equivalencies. Unit definitions, capacity factors and calculation standards.
Our methodology describes calculation standards, rounding and test procedures. For updates or a correction, contact [email protected]. Read the measurement disclaimer.
Explore the measurement silo
Related Converters
These pages cover separate unit intents. The fluid-ounce and weight-ounce pages are deliberately separate to prevent mixing volume with mass.