Free Calculator · Published October 2026
Fluid Ounces to Milliliters: Multiply by 29.57353
One U.S. fluid ounce is 29.57353 milliliters on the printed NIST line. Two fluid ounces are 59.14706 milliliters.
Put the fluid-ounce label and the milliliter label on the same ticket before anyone treats them as the gallon count.
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Book a DemoHow Fluid Ounces to Milliliters Uses 29.57353
This converter follows one row on the NIST Guide to the SI, Appendix B.8. The U.S. fluid ounce row multiplies by 2.957 353 and E+01 to reach milliliters. Gallons counted as 128 fluid ounces stay on gallons to fluid ounces.
U.S. fluid ounces, or milliliters of that volume.
All calculations are estimates based on historical information and should be verified by the user.
Important: All calculator results are ballpark estimates
All calculations are estimates based on historical information and should be verified by the user. This tool is provided as a free service for planning purposes only and is not a substitute for a professional assessment, a supplier quote, or applicable local code requirements.
What Is Fluid Ounces to Milliliters Using?
The printed U.S. fluid ounce, on the milliliter side, multiplies by 29.57353. The result is a volume label. It does not say how large a jug is, how much chemical to feed, or whether a sample passed a lab. Write U.S. fluid ounce next to the factor so the next visit does not swap in an imperial ounce or a gallon count.
One factor, both directions
The NIST table prints 2.957 353 in the multiply-by column and E+01 in the exponent column. Read together, that is 29.57353 milliliters in one U.S. fluid ounce. This page uses 29.57353 so a fluid ounce round-trips through milliliters. It does not build the result from 128 fluid ounces in a gallon.
One milliliter divided by 29.57353 is 0.03381 fluid ounces at five decimals. The engine divided by 29.57353. It did not divide by 128, and it did not use 3.7854 liters.
Common fluid ounce volumes
Each row multiplies by 29.57353 and shows five decimal places. These are not recommended jug sizes.
| Fluid ounces | Milliliters |
|---|---|
| 1 | 29.57353 |
| 2 | 59.14706 |
| 4 | 118.29412 |
| 8 | 236.58824 |
| 16 | 473.17648 |
Worked examples
One fluid ounce is 29.57353 milliliters. Two fluid ounces are 59.14706 milliliters. The reverse of 29.57353 milliliters is 1 fluid ounce. One milliliter is 0.03381 fluid ounces at five decimals.
| Case | Fluid ounces | Milliliters |
|---|---|---|
| 1 fluid ounce | 1 | 29.57353 |
| 2 fluid ounces | 2 | 59.14706 |
| 8 fluid ounces | 8 | 236.58824 |
| 29.57353 milliliters | 1 | 29.57353 |
| 1 milliliter | 0.03381 | 1 |
A fluid ounce is not a gallon
One hundred twenty-eight fluid ounces in a gallon stay on gallons to fluid ounces. Liters in a gallon, using 3.7854, stay on gallons to liters. A liter counted as cubic meters stays on liters to cubic meters. This page has no 128 and no 3.7854.
What to write on the job ticket
Write five lines before the number leaves this page. A later visit should not have to guess which ounce was used.
- The entered value, and whether it was fluid ounces or milliliters.
- The factor, 29.57353, named as the NIST U.S. fluid ounce line.
- Both results, milliliters and fluid ounces, at five decimals.
- Which jug, tag, or sheet the volume came from.
- A note that 128 and 3.7854 were not applied, and that the factor was not called exact.
What stays off this volume
An imperial fluid ounce is a different row on the same NIST page. This tool does not use it. A chemical dose in milligrams per liter is a different question, and this converter does not replace it.
A water treatment dealer who saves the 29.57353 note will not swap in 128 and call the result milliliters. This conversion does not size a softener and does not say a sample passed a county rule. A private-well lab sheet is still the well water testing guide.
Frequently Asked Questions
How many milliliters are in 1 fluid ounce?
NIST prints 2.957 353 times 10 to the first power as the multiplier from a U.S. fluid ounce to milliliters. That is 29.57353 milliliters. This page shows that product at five decimal places.
Does this page use 128 fluid ounces?
No. USGS prints 128 fluid ounces in one gallon. That count stays on the gallons to fluid ounces converter. This page does not multiply by 128.
Is 29.57353 an exact factor?
The NIST page says factors in boldface are exact. This fetch did not preserve boldface, so this tool does not call 29.57353 exact. It uses the digits the table printed.
What is 1 milliliter in fluid ounces?
One milliliter divided by 29.57353 is shown at five decimal places as 0.03381 fluid ounces. The engine divided by 29.57353.
Does the result size a dose?
No. The result is a unit change between a U.S. fluid ounce and milliliters. It is not a chemical dose, a tank size, or a pass line.
Save 29.57353 Next to the Volume
The fluid ounces, the milliliters, and the NIST line belong on the customer record.
Get a Free DemoAll calculations are estimates based on historical information and should be verified by the user. This tool is provided as a free service for planning purposes only and is not a substitute for a professional assessment, a supplier quote, or applicable local code requirements. It does not size a tank.