How Much Is 12 oz? | Weight, Volume & Real-World Cost

12 ounces as a weight equals 340.2 grams, while 12 fluid ounces of water weighs roughly 355 grams or 355 mL — the standard volume of a single US soda can.

Whether you are scaling a recipe, checking a nutrition label, or wondering why your single soda costs a dollar at one store and two at the next, knowing what 12 ounces actually means in grams and in cash makes the next decision faster. 12 oz shows up constantly — protein scoops, beer cans, coffee bags — but the number swaps meaning depending on whether you are measuring dry weight or liquid volume. Here is the breakdown, the math you can actually use, and what a 12 oz soda costs around the US right now.

12 Ounces as Weight: The Grams Answer

When a recipe or product label says “12 oz” and it refers to dry weight (avoirdupois ounces), the conversion is straightforward. Multiply by 28.3495 to get the gram equivalent.

12 oz (weight) = 340.2 grams, using the standard practical conversion of 1 oz = 28.35 g. The exact scientific figure is 340.194 g, but rounding to 340.2 g is precise enough for cooking, nutrition tracking, and most general uses.

To do the conversion yourself for any number of ounces, the formula is: g = oz × 28.3495. This applies to anything measured by weight — a 12 oz steak, a 12 oz bag of coffee beans, or a 12 oz tub of yogurt.

12 Fluid Ounces as Volume: The Grams and mL Answer

Here is where the confusion starts. “12 oz” on a soda can or a bottle of olive oil means fluid ounces — a measure of volume, not weight. One US fluid ounce equals 29.5735 mL. A standard US soda can holds exactly 12 fl oz, which is 355 mL.

Converting that volume to grams depends entirely on what is in the container:

• Water (density 1 g/mL): 12 fl oz = 354.88 g
• Cooking oil (density ~0.92 g/mL): 12 fl oz = roughly 312 g
• All-purpose flour (density ~0.53 g/mL): 12 fl oz = roughly 188 g

The general formula is: g = fl oz × 29.5735 × density (g/mL). Only water and water-like liquids hit the ~355 g mark. A common mistake is treating a fluid ounce label as a weight ounce — that swap introduces roughly a 15-gram error on water-based products.

Note on nutrition labels: the FDA rounds 1 fl oz to 30 mL for serving-size declarations, so the metric volume on a can’s label may read slightly higher than the real 355 mL.

12 oz Soda Can Prices in 2026: What You Actually Pay

The price of a single 12 oz can of soda varies more than you might expect. Location and purchase method drive the cost, not the product itself.

If you are shopping for a single can on the go, expect to pay $1.00 to $1.50 in most cities, and up to $2.29 in premium convenience stores like Wawa. Rural areas sometimes see singles as low as $0.75.

How to Avoid the Weight vs. Volume Trap

The simplest rule: if the label lists fluid ounces (fl oz or oz fl), treat it as volume — reach for the density formula or look up the specific product’s weight per serving. If the label just says “oz” on a dry product like meat, flour, or oats, use the 28.35 multiplier. RapidTables’ ounce-to-gram converter confirms the standard math for weight conversions.

For anyone buying a 12 oz soda in bulk, a roundup of the best 12 ounce bottles on our site covers the reusable options that make more sense than single-use cans over the long haul.

Quick Reference Table: 12 oz Conversions

Why the Distinction Matters

Using the wrong conversion can throw off a recipe or a macro count. A 12 oz chicken breast and a 12 oz soda have the same “12 oz” label, but the chicken is 340 grams of meat while the soda’s 12 oz is a volume measurement that weighs about 355 grams of liquid. Nutrition databases and kitchen scales almost always expect the weight ounce, while drink containers almost always use fluid ounces. Checking which system the label uses before doing the math saves the error.