How many calories are in a Coke Zero?
A 12 fl oz can of Coke Zero carries 7 calories. The USDA record behind it measures 2 calories per 100 g, which is about as close to nothing as a flavored drink gets. The can in your hand says 0, the lab says 7, and neither one is wrong.
On this page
- Coke Zero quick facts
- US servings, from a mini can to a fountain cup
- Caffeine free, bigger bottles and the fountain pour
- Sodium is the only row that moves
- How does Coke Zero compare?
- Most popular coke zero brands
- FAQ
Coke Zero quick facts
USDA has no analytical entry for the Coca-Cola brand itself. The closest full profile is SR Legacy 175099, "Beverages, carbonated, low calorie, cola or pepper-type, with aspartame, contains caffeine" — a caffeinated diet cola sweetened with aspartame, which is exactly what a Coke Zero Sugar is. That record is the one used everywhere on this page, and it is the reason a drink advertised as zero shows up here with a number next to it.
The brand's own entries in the USDA Branded database, such as the 12 fl oz can, fdc_id 1627902, list 0 calories, because those rows are transcribed from the printed Nutrition Facts panel rather than measured in a lab. Under FDA labeling rules, anything under 5 calories per serving may be declared as 0. Both numbers describe the same drink; one is rounded and one is not.
| Nutrient | Per 100 g | Per 1 can, 12 fl oz (355 g) | % Daily Value |
|---|---|---|---|
| Calories | 2 | 7 | — |
| Total fat | 0.03 g | 0.1 g | 0% |
| Saturated fat | 0 g | 0 g | 0% |
| Carbohydrate | 0.29 g | 1.0 g | 0% |
| Dietary fiber | 0 g | 0 g | 0% |
| Total sugars | 0 g | 0 g | — |
| Protein | 0.11 g | 0.4 g | 1% |
| Sodium | 8 mg | 28 mg | 1% |
% Daily Value is based on a 2,000-calorie diet.
Verified nutrition data
Numbers on this page come from USDA FoodData Central, the U.S. Department of Agriculture’s food composition database, and from manufacturer labels where a branded product is named. Last verified September 2026. How we verify our data →
There is no added sugars row above because the SR Legacy edition of this record does not carry that field at all, and the drink has no sugar of any kind to declare — total sugars are 0 g. Cholesterol is 0 mg. Potassium comes in at 8 mg per 100 g, or 28 mg in a can, which is under 1% of the 4,700 mg Daily Value and far below what a single small banana would give you.
The two rows people actually notice are protein and carbohydrate, and both are trace amounts. A can holds 1.0 g of carbohydrate and 0.4 g of protein, neither of which registers on a day of eating. If you log this drink at 7 calories, or at 0, your daily total lands in the same place.
US servings, from a mini can to a fountain cup
| Serving | Weight | Calories |
|---|---|---|
| 1 oz | 28.4 g | 1 kcal |
| Per 100 g | 100 g | 2 kcal |
| 1 glass with ice, 12 fl oz | 258 g | 5 kcal |
| 1 can, 12 fl oz | 355 g | 7 kcal |
| 1 bottle, 16 fl oz | 473 g | 9 kcal |
| 1 fountain drink, large, 32 fl oz | 722 g | 14 kcal |
The 12 fl oz can is the USDA household measure and the number most people want. Everything else in that table is our own arithmetic from the USDA 100 g figure rather than a listed USDA serving: the ounce line, the bottle, the fountain cup and the iced glass are all the 2 calories per 100 g figure scaled to a weight.
The iced glass is worth a second look, because it is the one place the volume on the cup lies to you. A 12 fl oz glass filled with ice and then topped up holds roughly 258 g of liquid, not 355 g — about 27% less drink for the same nominal size. With a soda this light that costs you two calories and nothing else, but the same ice math is what quietly shrinks a fountain lemonade or a sweetened iced tea by a quarter.
Go the other way and the large fountain cup is 722 g of liquid, more than two cans. It still lands at 14 calories, exactly double what the can carries.
Caffeine free, bigger bottles and the fountain pour
| Version | Per 100 g | Typical serving | Calories |
|---|---|---|---|
| Coke Zero Sugar, label figure | 0 kcal | 12 fl oz can, 355 g | 0 kcal |
| Diet cola with aspartame and caffeine (USDA lab) | 2 kcal | 12 fl oz can, 355 g | 7 kcal |
| Caffeine free diet cola with aspartame | 1 kcal | 12 fl oz can, 355 g | 4 kcal |
| Diet non-cola soda with aspartame | 0 kcal | 12 fl oz can, 355 g | 0 kcal |
| Diet cola, 16 fl oz bottle | 2 kcal | 473 g | 9 kcal |
| Diet cola, 32 fl oz fountain cup | 2 kcal | 722 g | 14 kcal |
Caffeine Free Coke Zero Sugar maps to a different USDA record, and that record measures 1 calorie per 100 g instead of 2, which is 4 calories in a can once we scale it to 355 g ourselves. The gap is measurement noise on a drink this dilute, not a real difference in the formula, and the printed label on both cans reads 0.
The diet lemon-lime and orange sodas sitting next to the colas in the cooler come in at 0 calories per 100 g in the USDA data, because they carry no caramel color and none of the trace solids that push a cola to 2. That is the whole spread of the diet soda aisle: everything between 0 and 14 calories, depending mostly on cup size.
Every Coke Zero Sugar package in the USDA Branded set behaves the same way on paper. The 8 fl oz mini can, the 10.5 fl oz, the 12 fl oz can, the 14 fl oz, the 16 fl oz bottle and the caffeine free 12 fl oz all declare 0 calories per serving, all from Coca-Cola USA Operations. Package size changes the sodium and the caffeine you drink, not the calorie line on the panel.
Sodium is the only row that moves
Calories are settled, so the only nutrient here that scales into anything visible is sodium. A can gives 28 mg, or 1% of the 2,300 mg Daily Value. The 16 fl oz bottle gives 38 mg, and the 32 fl oz fountain cup gives 58 mg, which is 3% of the day. Those figures are our own arithmetic from the USDA 100 g value of 8 mg.
None of that is a problem on its own. It matters only because sodium arrives in small amounts from many places at once, and the Dietary Guidelines for Americans put the 2,300 mg limit on the total from every source, not from the obviously salty foods alone. Three large fountain refills across a workday is roughly 174 mg before you have eaten anything.
The honest summary of the rest of the panel is that there is nothing to watch. Zero sugar, zero fat, zero fiber, 1.0 g of carbohydrate and 0.4 g of protein per can. This drink does no nutritional work in either direction. It is a flavor and a caffeine delivery vehicle with essentially no energy attached, which is the entire point of it.
One thing this page will not give you is a caffeine number. The USDA record is defined as a cola with caffeine, so the drink is certainly caffeinated, but the milligram figure people quote for Coke Zero comes from the manufacturer's own label rather than a USDA analysis, and this page only publishes numbers it can trace to the USDA record cited above.
How does Coke Zero compare?
| Drink | Per 100 g | US serving | Calories |
|---|---|---|---|
| Coke Zero (diet cola, USDA lab record) | 2 kcal | 12 fl oz, 355 g | 7 kcal |
| Diet lemon iced tea, ready to drink | 1 kcal | 12 fl oz, 355 g | 4 kcal |
| Brewed coffee, black | 1 kcal | 12 fl oz, 355 g | 4 kcal |
| Green tea, brewed | 1 kcal | 12 fl oz, 355 g | 4 kcal |
The 12 fl oz servings for the tea and coffee rows are our own arithmetic from their USDA 100 g figures, since none of those records lists a can.
Our take: the diet cola is the highest of the four, and the difference is three calories, so ranking these drinks by energy is a waste of attention. Pick by what else comes with the glass. If you are watching sodium, black coffee and brewed tea bring essentially none while a large fountain cola brings 58 mg. If what you want is the cola flavor without the sugar of a regular can, Coke Zero does that job at 7 calories. The swap that actually changes a weight-loss ledger is regular soda to diet soda, not diet soda to water — CDC's Rethink Your Drink guidance makes the same point about where the calories in a day's drinks really sit.
Most popular coke zero brands in the United States
Ranked by how widely each product appears among foods sold in the United States, from the BodyPal food database of over 3.3 million products. Calories are the figures printed on each Nutrition Facts label, checked against USDA FoodData Central.
| Product | Calories (per 100 g) |
|---|---|
| Coke Zero Sugar 12 fl oz Can | 0 cal |
| Coke Zero Sugar 16 fl oz Bottle | 0 cal |
| Coke Zero Sugar 14 fl oz | 0 cal |
| Coke Zero Sugar 8 fl oz Mini Can | 0 cal |
| Coke Zero Sugar 10.5 fl oz | 0 cal |
| Caffeine Free Coke Zero Sugar 12 fl oz | 0 cal |
Brand popularity: BodyPal food database. Nutrition: manufacturer labels / USDA FoodData Central.
Coke Zero FAQs
How many calories are in a can of Coke Zero?
A 12 fl oz can holds 7 calories, based on the USDA lab record for a caffeinated diet cola at 2 calories per 100 g and a can weight of 355 g. The printed label says 0, because FDA rules let anything under 5 calories per serving be declared as zero.
Is Coke Zero really zero calories?
Not literally zero, but 7 calories in a can is close enough that it never moves a daily total. The USDA analytical record measures 2 calories per 100 g. The 0 on the panel is a legal rounding allowed for anything under 5 calories per serving, not a claim that the liquid contains no energy at all.
How much caffeine is in Coke Zero?
USDA record 175099 is defined as a cola that contains caffeine, but it carries no milligram figure, so this page publishes none. The amount usually quoted for Coke Zero comes from the manufacturer's label rather than a USDA analysis. The caffeine free version maps to a separate USDA record at 4 calories per can.
Coke Zero vs Diet Coke: what is the difference?
On the numbers, nothing separates them: both fall under USDA record 175099 at 2 calories per 100 g, or 7 calories per 12 fl oz can. USDA does not publish separate analytical records for the two brands, since both are caffeinated colas sweetened with aspartame. The difference is the flavor formula, which no nutrient database measures.
How much sodium is in Coke Zero?
A 12 fl oz can carries 28 mg of sodium, 1% of the 2,300 mg Daily Value. USDA measures 8 mg per 100 g. A 16 fl oz bottle works out to 38 mg and a 32 fl oz fountain cup to 58 mg, or 3% of the day, both scaled by us from the 100 g value.
Does Coke Zero have sugar or carbs?
No sugar and 1.0 g of carbohydrate per 12 fl oz can, which is 0% of the Daily Value. Total sugars measure 0 g in the USDA record, so the sweetness is entirely from aspartame. The SR Legacy edition carries no added sugars field, and there would be nothing to report in it anyway.
How many calories in a 20 oz Coke Zero?
About 12 calories. A 20 fl oz bottle holds roughly 592 g of liquid, and at 2 calories per 100 g that lands at 12, with about 47 mg of sodium. USDA lists no 20 fl oz serving for this record, so that is our own arithmetic from the 100 g figure rather than a USDA serving size.
Is Coke Zero bad for weight loss?
It contributes 7 calories a can, so it adds essentially nothing to a daily total. If you are drinking it in place of a regular cola, that is one of the largest single swaps available in a normal day. If you are counting calories, log the can at 7 or at 0 and your numbers land in the same place.
Similar foods
- Tom yum soup — 191 cal per bowl
- Clementine — 35 cal per clementine
- Ceviche — 158 cal per cup
- Pomegranate — 72 cal for 1/2 cup arils
- Clam Chowder — 237 cal per cup
- Chinese Chicken and Broccoli — 206 cal per cup
Count it without the math
Point the camera at the glass and BodyPal logs the can, the bottle or the fountain cup for you.
