Nutrition Facts for 16.9 fl oz (0.5 L) Diet Coke Bottle

This article summarizes the nutrition facts, caffeine content, phenylalanine warning, and full ingredient list for a standard 16.9 fluid ounce (0.5 liter) plastic bottle of Diet Coke sold in the United States. Diet Coke is available in multiple sizes, including 7.5 fl oz, 12 fl oz cans, and 16.9 fl oz bottles; the formulation described here is the regular caffeinated U.S. version, not caffeine-free or flavored variants.

Serving size definition

For the 16.9 fl oz bottle:

• Serving size: 1 bottle

• Volume: 16.9 U.S. fluid ounces (500 milliliters)

• Weight (as used in USDA/brand data): approximately 507 g for 1 bottle

All data below refer to one complete 16.9 fl oz (0.5 L) bottle.

Nutrition Facts for one 16.9 fl oz Diet Coke bottle

Diet Coke is an essentially non-caloric, non-nutritive soft drink: virtually all of the liquid mass is water, with very small amounts of dissolved acids, sweeteners, and flavorings.

Based on U.S. branded/USDA data for Diet Coke Bottles, 16.9 fl oz and on the labeled 12 fl oz can panel scaled to bottle size, a typical 16.9 fl oz bottle has the following nutritional profile:

Nutrient	Amount per bottle (16.9 fl oz / ~507 g)	% Daily Value (DV)*
Calories	0 kcal	0%
Total Fat	0 g	0%
– Saturated Fat	0 g	0%
– Trans Fat	0 g	0%
Cholesterol	0 mg	0%
Sodium	≈ 55–60 mg (see explanation below)	≈ 2–3%
Total Carbohydrate	0 g	0%
– Dietary Fiber	0 g	0%
– Total Sugars	0 g	0%
– Added Sugars	0 g	0%
Protein	0 g	0%
Caffeine	≈ 64–66 mg per bottle	Not established

*Daily Values are based on a 2,000-kcal diet.

Notes on sodium

• The 12 fl oz Diet Coke can is labeled at 40 mg sodium (2% DV) per 12 fl oz serving.

• Scaling that same formulation to 16.9 fl oz gives roughly:

Sodium per bottle≈40 mg×16.912≈56 mg\text{Sodium per bottle} \approx 40\,\text{mg} \times \frac{16.9}{12} \approx 56\,\text{mg}Sodium per bottle≈40mg×1216.9​≈56mg

• That value would typically round on a Nutrition Facts label to about 60 mg sodium (~3% DV).

• A current USDA-linked branded entry for Diet Coke Bottles, 16.9 fl oz lists sodium as 0 mg, likely reflecting missing or rounded-down data rather than a genuinely sodium-free formulation, because the 12 fl oz Diet Coke panel clearly shows sodium present.

Given these sources, a reasonable and conservative description for a 16.9 fl oz bottle is “about 55–60 mg sodium, or about 2–3% of the Daily Value”, while still recognizing that some databases currently list sodium as 0 mg due to data gaps or rounding.

Notes on caffeine

Caffeine data for Diet Coke are more consistent:

• Multiple sources for 12 fl oz list 46 mg caffeine per 12 fl oz.

• Scaling to 16.9 fl oz gives:

46 mg×16.912≈64.8 mg46\,\text{mg} \times \frac{16.9}{12} \approx 64.8\,\text{mg}46mg×1216.9​≈64.8mg

• A retailer listing for Diet Coke Bottles, 16.9 fl oz, 6-pack explicitly states: “Caffeine Content: 64 mg” per bottle.

• The USDA-linked branded data for Diet Coke Bottles, 16.9 fl oz report 65.9 mg caffeine per 507 g bottle.

Taken together, the caffeine content of a 16.9 fl oz Diet Coke bottle can be summarized as:

• Analytical database value: ~65.9 mg per bottle

• Typical labeled/retail value: about 64 mg per bottle

Phenylalanine and the Diet Coke warning label

Why the label mentions phenylalanine

Diet Coke is sweetened with aspartame, a low-calorie sweetener made from the amino acids phenylalanine and aspartic acid.

People with a rare genetic disorder called phenylketonuria (PKU) cannot properly metabolize phenylalanine. If phenylalanine builds up in the body, it can lead to neurological damage and other serious health problems. For this reason, U.S. regulations require that any product containing aspartame carry a specific warning so individuals with PKU can identify and avoid those products.

Exact warning text

On Diet Coke products containing aspartame, the required warning appears as:

PHENYLKETONURICS: CONTAINS PHENYLALANINE

This is a regulatory statement aimed specifically at people with PKU (phenylketonuria). For individuals who do not have PKU, major medical and regulatory bodies regard aspartame and phenylalanine exposure from diet sodas as acceptable within normal intake limits.

Ingredients in a 16.9 fl oz Diet Coke bottle

The U.S. ingredient line for standard Diet Coke (including the 16.9 fl oz bottle) is consistent across manufacturer and retailer sources and is typically listed as:

CARBONATED WATER, CARAMEL COLOR, ASPARTAME, PHOSPHORIC ACID, POTASSIUM BENZOATE (TO PROTECT TASTE), NATURAL FLAVORS, CITRIC ACID, CAFFEINE.

Brief description of each ingredient:

• Carbonated water - The base of the beverage; essentially all of the 507 g serving weight is water with dissolved carbon dioxide, giving the drink its fizz.

• Caramel color - A common food coloring produced by controlled heating of carbohydrates; provides Diet Coke’s brown color.

• Aspartame - A high-intensity, low-calorie sweetener approximately 200 times sweeter than sucrose (table sugar). This ingredient is the source of phenylalanine, creating the need for the PKU warning on the label.

• Phosphoric acid - An acidulant that contributes tartness and affects flavor balance; also used in many other colas.

• Potassium benzoate (to protect taste) - A preservative that helps inhibit microbial growth and maintain flavor stability over shelf life.

• Natural flavors - Proprietary flavoring components derived from natural sources, used to give Diet Coke its characteristic taste.

• Citric acid - Another acidulant that adjusts acidity and enhances flavor brightness.

• Caffeine - The stimulant component of Diet Coke; for a 16.9 fl oz bottle, the caffeine content is roughly 64–66 mg, as detailed above.

Practical takeaways

For a 16.9 fl oz (0.5 L) plastic bottle of Diet Coke in the U.S.:

• Energy and macronutrients:

  • 0 kilocalories

  • 0 g fat

  • 0 g carbohydrates (0 g total and added sugars)

  • 0 g protein

• Sodium:

  • Realistically on the order of 55–60 mg per bottle, or about 2–3% of the Daily Value, based on the 12 fl oz can label (40 mg sodium) scaled to bottle size and classified by retailers as “low sodium.”

• Caffeine:

  • Approximately 64–66 mg per 16.9 fl oz bottle, with retailer labels often stating 64 mg and USDA-linked branded data indicating 65.9 mg.

• Phenylalanine warning:

  • Carries the mandatory statement “PHENYLKETONURICS: CONTAINS PHENYLALANINE” due to the presence of aspartame, which is relevant for individuals with phenylketonuria (PKU).

• Ingredients:

  • Carbonated Water, Caramel Color, Aspartame, Phosphoric Acid, Potassium Benzoate (to Protect Taste), Natural Flavors, Citric Acid, Caffeine.

***Product information can change at any time. For the most up to date and accurate nutrition, ingredient, allergen, and other product information, please view the product label.

***This information does not constitute health or medical advice.