Liquid Measurement Conversion Chart for Bottles and Packaging

This liquid measurement conversion chart is a complete reference for converting between every volume unit you will encounter when ordering bottles, jars, and other packaging. Whether you are comparing fluid ounces to milliliters on a spec sheet or trying to figure out how many drams are in an ounce, the tables below have you covered.

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We built this packaging volume guide because unit confusion is one of the biggest sources of ordering mistakes in the bottle and container industry. A supplier in Europe lists capacity in milliliters. A formula calls for a container measured in cubic centimeters. Your customer wants the size printed in fluid ounces. This single page puts every liquid volume conversion you need in one place.

For quick, on the fly calculations, you can also use our volume converter tool.

The Master Liquid Volume Conversion Table

The table below covers the core units used in packaging, laboratory, food service, and cosmetics. All values are based on U.S. customary fluid measurements as defined by the National Institute of Standards and Technology (NIST).

Quick reference conversions to memorize:

• 1 fl oz = 29.5735 mL
• 1 mL = 1 cc (exactly)
• 1 liter = 33.814 fl oz
• 1 gallon = 3,785.41 mL
• 8 drams = 1 fl oz
• 2 tablespoons = 1 fl oz

If you work with oz to mL conversions regularly, that first number is the one to commit to memory. Multiply the number of fluid ounces by 29.5735 and you get milliliters every time.

Metric vs. Imperial: What is the Difference?

The metric system and the imperial (U.S. customary) system are the two measurement frameworks you will run into when sourcing packaging. Understanding the difference helps you avoid costly ordering errors.

The imperial system uses fluid ounces, cups, pints, quarts, and gallons. It is the standard in the United States for consumer product labeling and everyday commerce. Most domestic bottle suppliers list capacity in fluid ounces first.

The metric system uses milliliters and liters. It is the global standard and the system used by most international suppliers, pharmaceutical companies, and scientific laboratories. The metric system is base 10, meaning conversions within the system are simple. There are 1,000 milliliters in a liter, 1,000 liters in a cubic meter, and so on.

In the United States, the FDA requires that most product labels display net contents in both metric and U.S. customary units. This dual labeling requirement is one reason packaging professionals need to be fluent in both systems.

A helpful way to think about it: the metric system scales neatly by factors of 10, while the imperial system uses varied multipliers (8 ounces in a cup, 2 cups in a pint, 2 pints in a quart, 4 quarts in a gallon). This is why a liquid measurement conversion chart is essential rather than optional when you are working across both systems.

For a deeper look at how units like mL, mm, and mil get mixed up in the packaging world, check out our guide on m vs mm vs mL vs mil in packaging.

Common Bottle Sizes and Their Conversions

When you are browsing a packaging catalog or spec sheet, bottles are usually listed by their fluid ounce or milliliter capacity. Here is a bottle size conversion table that covers the most common sizes you will find across cosmetics, food and beverage, pharmaceutical, and essential oil packaging.

If you need essential oil bottles in the smaller sizes like 5 mL, 10 mL, or 1 oz, those are among the most commonly ordered SKUs in the packaging industry.

Note that some bottle specs list capacity in "cc" rather than mL. As we explain in our article on cc vs mL, these two units are functionally identical. A 30 cc bottle is the same as a 30 mL bottle.

How to Use These Conversions When Ordering Packaging

Knowing the numbers is one thing. Applying them correctly when placing an order is another. Here are the practical guidelines that help packaging buyers get it right.

Always confirm which "ounce" is being referenced. Fluid ounces measure volume. Weight ounces (avoirdupois) measure mass. A bottle labeled "8 oz" in a packaging catalog almost always means 8 fluid ounces (236.59 mL), but some products, especially those sold by weight, could mean 8 ounces by mass. When in doubt, ask for the mL capacity.

Understand overflow vs. fill capacity. Most bottles have two capacity ratings. The overflow capacity is the absolute maximum the bottle can hold when filled to the brim. The fill capacity (also called the working capacity or the labeled capacity) is the volume the bottle is designed to hold in normal use, leaving headspace for a cap, expansion, or a dispensing mechanism. A bottle sold as "8 oz" might have an overflow capacity of 250 mL but a fill capacity of 236 mL.

Use metric for international orders. If you are sourcing packaging from manufacturers in Asia or Europe, communicate in milliliters and liters. This eliminates rounding errors and the ambiguity between U.S. fluid ounces and imperial fluid ounces (which differ slightly; 1 imperial fl oz = 28.413 mL vs. 1 U.S. fl oz = 29.574 mL).

Round thoughtfully. For day to day ordering, rounding 29.5735 mL to 30 mL per fluid ounce is common and acceptable. But if you are ordering tens of thousands of units and the fill level is critical for regulatory compliance, use the precise figure. Our volume converter tool handles the precision for you.

Check label compliance. U.S. regulations require net quantity declarations on product labels. Make sure the volume printed on your label matches the actual fill volume of the bottle you select. A mismatch between bottle size and label claim can lead to compliance issues and product recalls.

Specialty Measurements: CC, Dram, Minim, and More

Beyond the standard units, the packaging world uses several specialty measurements that show up on spec sheets, especially in pharmaceutical and cosmetic contexts.

Cubic Centimeter (cc): One cc is exactly equal to one milliliter. The term cc is more common in medical and pharmaceutical settings. If you see a syringe or dropper bottle rated at 10 cc, it holds 10 mL. Read more in our full breakdown of cc vs mL.

Dram (fluid dram): A fluid dram is 1/8 of a fluid ounce, or approximately 3.697 mL. Drams are still used in pharmaceutical compounding and are sometimes listed on small vial and dropper bottle spec sheets. There are 8 fluid drams in 1 fluid ounce.

Minim: A minim is the smallest traditional unit of liquid volume in the apothecary system. One minim equals approximately 0.0616 mL. There are 60 minims in a fluid dram. While rarely used in modern packaging, you may still encounter it in legacy formulations or older pharmaceutical references.

Gill: A gill equals 4 fluid ounces or 118.294 mL. This unit is uncommon today but occasionally appears in beverage industry specifications, especially in reference to spirit and wine measurements.

Drop: While not a standardized unit, "drops" appear frequently in essential oil and tincture packaging. A standard dropper drop is generally estimated at 0.05 mL, meaning roughly 20 drops per milliliter. However, drop size varies with liquid viscosity and dropper design, so this figure is an approximation only.

Understanding these units means you will never be caught off guard by an unfamiliar abbreviation on a packaging spec sheet. When you see "fl dr" next to a vial capacity, you now know that is a fluid dram, and you can multiply by 3.697 to get milliliters.