Calories in Diet Coke
Updated July 2026 · Source: USDA FoodData Central
☕ Calculate Calories in Any Amount of Diet Coke
Nutrition Facts
* % Daily Value based on a 2,000 kcal diet.
Nutritional Content — per 100ml
| Component | Amount | % Daily Value | Bar |
|---|---|---|---|
| Caffeine | 46mg/can | — | |
| Sodium | 12mg | 1% | |
| Aspartame | ~125mg/can | — | |
| Potassium | 0mg | 0% | |
| Calcium | 0mg | 0% | |
| Magnesium | 0mg | 0% | |
| Vitamin C | 0mg | 0% | |
| Iron | 0mg | 0% | |
| Sugar | 0g | — | |
| Protein | 0g | 0% |
Calories in Diet Coke by Volume
| Volume | Calories | Sugar | Carbs |
|---|
Calorie Breakdown — per 100ml
Aspartame sweetener provides sweetness with near-zero calories. 46mg caffeine per can. pH ~3.2 — still acidic but less than regular Coke (2.5). Zero sugar, zero GI impact in most people. Safe for most people including diabetics (not PKU sufferers).
Key Compounds
Diet Coke Facts
Aspartame — The Evidence Base
Aspartame has been one of the most studied food additives in history. The FDA, EFSA, WHO, and national health agencies in 90+ countries have evaluated the evidence and confirmed safety at normal consumption levels. The acceptable daily intake (ADI) is 40-50mg/kg body weight — a 70kg person would need to drink 14+ cans of Diet Coke daily to approach this limit. A 2023 WHO review classified aspartame as 'possibly carcinogenic' (Group 2B) — the same category as aloe vera extract and pickled vegetables — which reflects limited/inadequate evidence rather than confirmed harm.
Calorie Reduction for Sugar Switchers
For people currently consuming regular sugar-sweetened beverages daily, switching to diet versions provides clear benefits: eliminating 39-50g of sugar per serving, reducing calorie intake by 130-200 kcal per serving, and removing a significant driver of insulin resistance and dental erosion. The evidence for switching from regular to diet soda being beneficial for metabolic health is stronger than the evidence of diet soda causing independent harm.
Dental Consideration
While Diet Coke eliminates the sugar-acid synergy of regular Coke, it still has a pH of approximately 3.2 — below the critical pH of 5.5 where tooth enamel begins to dissolve. Regular Diet Coke consumption still presents some dental erosion risk, though less than regular Coke. Drinking through a straw, rinsing with water, and not brushing immediately after consumption reduce but don't eliminate this risk.
Sweet Taste and Appetite
Some research suggests that sweet taste — even from calorie-free sweeteners — may perpetuate sweet food preference and cravings. This psychological effect is highly variable between individuals. For some people, diet sodas maintain a preference for sweet flavours that transfers to other foods; for others, they effectively satisfy sweet cravings without caloric consequences. Individual response varies significantly.
Diet Coke vs Other Drinks
Is Diet Coke Suitable for Your Diet?
Related Calculators
Frequently Asked Questions
Sources
Nutrition values from USDA FoodData Central. Not medical advice.