Sugar Nutrition Facts: Calories, Carbohydrates, and Added Sugars
Author: Ukrainian Psychological Hub · Published: September 29, 2026 · Editorial Policy
Granulated table sugar is nutritionally simple: it is almost entirely carbohydrate, and that carbohydrate is almost entirely sucrose. In the USDA National Nutrient Database reference for granulated sugar, 100 grams provides 387 calories, 99.98 grams of carbohydrate, 99.80 grams of total sugars, and essentially zero fat, protein, or dietary fiber. The same reference gives 1 teaspoon as 4.2 grams, with 16 calories and about 4.2 grams of carbohydrate and sugar. USDA’s archived SR28 record is a useful compositional benchmark; current USDA food-composition work is maintained through FoodData Central and the Food and Nutrition Information Center.
On a U.S. Nutrition Facts label, pure table sugar also belongs to the category “Added Sugars.” That can sound counterintuitive because nothing has been added to the sugar itself. The category describes how the sugar enters the diet, not whether another ingredient was mixed into the bag. The FDA definition of Added Sugars explicitly includes foods packaged as sweeteners, such as table sugar.
Sugar Nutrition Facts at a Glance
For ordinary white granulated table sugar, these are useful approximate amounts. Spoon weights vary slightly with the product and how a spoon is filled, so a package label should take priority when you need the value for a specific product.
• 1 teaspoon, about 4.2 g: about 16 calories; about 4.2 g total carbohydrate; about 4.2 g total sugar; 0 g fiber; 0 g protein; 0 g fat.
• 1 tablespoon, about 12.6 g: about 48–49 calories; about 12.6 g total carbohydrate and sugar.
• 1/4 cup, about 50 g: about 193–195 calories; about 50 g total carbohydrate and sugar.
• 1 cup, about 200 g: about 773 calories; about 200 g total carbohydrate and about 200 g sugar.
• 100 g: 387 calories; 99.98 g carbohydrate; 99.80 g total sugars; 99.80 g sucrose in the USDA SR28 reference.
The arithmetic is intuitive because traditional sugars are carbohydrates. The USDA’s Food and Nutrition Information Center gives the general energy factor of 4 calories per gram of carbohydrate. Food-composition databases may use more specific Atwater factors for a particular food, while packaged-food labels also apply regulatory rounding rules. That is why you may see small differences such as 15, 16, or 17 calories for a teaspoon rather than one universal number.
What Exactly Is Table Sugar?
In everyday American English, “table sugar” usually means sucrose, the crystalline sweetener commonly refined from sugar cane or sugar beets. Sucrose has the molecular formula C12H22O11 and is a disaccharide built from glucose and fructose units. The chemical identity is described in the U.S. National Library of Medicine’s PubChem record for sucrose.
This matters for nutrition labels because “sugar” can mean several different things. Sucrose is one specific sugar. Glucose, fructose, lactose, maltose, and other simple carbohydrates are also sugars. “Total Sugars” on a Nutrition Facts label is a labeling category that can contain more than one specific sugar. “Added Sugars” is another labeling category based on the source and use of sugars in a food.
Is Sugar a Carbohydrate?
Yes. Sugar is a carbohydrate. More precisely, the word “sugars” generally refers to simple carbohydrates, while the broader carbohydrate category also includes starches and dietary fiber. On the U.S. Nutrition Facts label, Total Sugars appears under Total Carbohydrate because sugar grams are part of the total carbohydrate grams.
For pure granulated sugar, almost every gram is carbohydrate, so the numbers are nearly identical. For a mixed food, they usually are not. A cereal, yogurt, sauce, fruit product, or baked food can contain total carbohydrate from sugar plus starch and fiber. Reading only the Total Sugars line therefore does not tell you the food’s total carbohydrate content.
How Many Calories Are in Sugar?
Traditional sugars such as sucrose provide about 4 calories per gram. The FDA explains that traditional sugars such as sucrose are treated as providing 4 calories per gram, while certain other sugars that are metabolized differently can be handled differently for labeling purposes. The general 4-calorie rule is therefore appropriate for ordinary table sugar, but it should not be automatically transferred to every sweetener.
Calories in a teaspoon of sugar
A level teaspoon of granulated sugar is about 4.2 grams in the USDA reference, which corresponds to about 16 calories in that database. This is why “about 16 calories per teaspoon” is a useful everyday estimate.
Calories in a tablespoon of sugar
A tablespoon is three teaspoons. Using the same household-measure reference, that is about 12.6 grams of sugar and roughly 48–49 calories. A label or recipe can differ slightly because sugar crystals, spoon filling, product moisture, and rounding affect the measured weight.
Calories in 100 grams of sugar
The USDA SR28 entry lists 387 calories per 100 grams of granulated sugar. That may look lower than the simple 4 × 100 = 400 calculation. The reason is that the database uses a food-specific carbohydrate calorie factor for this entry and reports measured composition rather than assuming that exactly 100.00 grams of every sample is metabolizable carbohydrate. For practical label reading, the difference is small; for a specific product, use its own Nutrition Facts label.
What Nutrients Does Granulated Sugar Contain?
Carbohydrate and total sugars
Carbohydrate is the dominant nutrient. In the USDA reference, granulated sugar contains 99.98 grams of carbohydrate and 99.80 grams of total sugars per 100 grams. The listed sugar is essentially all sucrose.
Protein, fat, and fiber
Granulated table sugar contains essentially no protein, fat, or dietary fiber. This is why nearly all of its food energy comes from carbohydrate. A “fat-free” or “protein-free” description does not by itself make a food nutritionally better or worse; it only tells you what macronutrients are present.
Vitamins and minerals
Refined granulated sugar contains only trace amounts of minerals in standard composition data and no nutritionally meaningful amount of fiber, protein, or the vitamins typically highlighted on a Nutrition Facts label. Its main nutritional contribution is carbohydrate energy, while its culinary contributions include sweetness, browning, texture, moisture control, fermentation substrate, and structure in many foods.
Total Sugar vs Added Sugar: The Difference on a U.S. Label
This is the part of sugar labeling that causes the most confusion. The FDA’s Nutrition Facts guidance distinguishes Total Sugars from Added Sugars. The dedicated explainer Total Sugar vs Added Sugar: What Nutrition Labels Mean shows why the Added Sugars grams are already included inside Total Sugars.
Total Sugars
Total Sugars includes all sugars present in one serving, whether those sugars occur naturally in an ingredient or were added during processing. A plain dairy food can contain naturally occurring lactose. Whole or processed fruit can contain naturally occurring glucose, fructose, and sucrose. A sweetened version of the same food can contain those sugars plus added sugars.
The FDA has not established a Daily Value for Total Sugars. That is why the Total Sugars line normally shows grams without a % Daily Value.
Added Sugars
Added Sugars include sugars added during processing, such as sucrose or dextrose; foods packaged as sweeteners, such as table sugar; sugars from syrups and honey; and sugars from concentrated fruit or vegetable juices as defined by FDA labeling rules. Naturally occurring sugars in milk, fruits, and vegetables are excluded from the U.S. Added Sugars category. The FDA currently sets the Daily Value for added sugars at 50 grams for a 2,000-calorie reference diet.
Why pure sugar can be “added sugar”
A bag of table sugar is a single-ingredient product, yet the sugar it provides is still treated as added sugar for Nutrition Facts purposes because it is packaged as a sweetener. The FDA has a special presentation rule for single-ingredient sugars and syrups: the label must communicate the % Daily Value contribution without making it look as though extra sugar was added to the sugar itself. FDA guidance explains this single-ingredient exception.
Added Sugars vs Free Sugars: They Are Not the Same Term
“Added sugars” is the U.S. regulatory label concept used on the Nutrition Facts panel. “Free sugars” is the broader term used by the World Health Organization. WHO defines free sugars as monosaccharides and disaccharides added to foods or drinks by a manufacturer, cook, or consumer, plus sugars naturally present in honey, syrups, fruit juices, and fruit juice concentrates. It does not treat the sugars naturally present in intact fruit and vegetables or milk as free sugars.
The categories overlap substantially, but they are not interchangeable. A U.S. label question should be answered with FDA definitions. A WHO public-health recommendation should be interpreted using the WHO free-sugars definition. The WHO guideline information note recommends reducing free sugars to less than 10% of total energy intake and suggests a further reduction below 5% for additional benefits.
How to Read Sugar on a Nutrition Facts Label
1. Start with serving size
Every calorie and nutrient number on the panel is tied to the serving size unless the package uses an additional per-package or dual-column presentation. The FDA emphasizes that serving size reflects the amount people typically consume and is not a recommendation. If you eat two servings, you generally double the listed calories, total carbohydrate, total sugars, and added sugars.
2. Read Total Carbohydrate
This is the broad carbohydrate amount. The FDA Daily Value for Total Carbohydrate is 275 grams for the standard 2,000-calorie label reference. The number is a labeling reference, not a personalized prescription.
3. Read Total Sugars
This tells you how many grams of all sugars are present in the serving. It does not distinguish naturally occurring from added sugars by itself, and it does not have a % Daily Value.
4. Read the “Includes X g Added Sugars” line
This amount is already part of Total Sugars; it is not an extra quantity to add on top. If a yogurt says “Total Sugars 15 g” and “Includes 7 g Added Sugars,” the serving has 15 grams of sugar in total, of which 7 grams are added sugars. The other 8 grams are not added sugars under the label definition.
5. Use % Daily Value as context
The FDA’s % Daily Value guide treats 5% DV or less per serving as low and 20% DV or more as high for a nutrient. Because the Added Sugars Daily Value is 50 grams, 5 grams of added sugar equals 10% DV, 10 grams equals 20% DV, and 25 grams equals 50% DV.
What Does One Teaspoon of Sugar Mean on the Label?
One teaspoon of granulated sugar, about 4.2 grams, supplies roughly 8% of the FDA Daily Value for added sugars because 4.2 ÷ 50 is about 0.084. The same teaspoon contributes only about 1.5% of the Total Carbohydrate Daily Value of 275 grams. These percentages differ because “total carbohydrate” and “added sugars” are different label categories with different Daily Values.
This is also why converting every sugar number into teaspoons can be useful for visualization but should not replace the label. The grams and %DV are the standardized regulatory information. Teaspoons are a household measure, and the weight of a spoonful can vary.
Why Sugar Labels Sometimes Seem Inconsistent
Serving-size differences
Two products can list different calories simply because one label uses a larger serving. Always compare both the serving amount and the nutrient numbers.
Rounding
Nutrition labels use regulatory rounding conventions, while scientific databases can report more precise analytical values. Small discrepancies do not necessarily mean one source is wrong.
Household measures are approximate
A teaspoon is a volume measure; grams are a mass measure. Crystal size, packing, and how level the spoon is can change the mass. The USDA reference’s 4.2 grams per teaspoon is a useful standard estimate, not a guarantee that every spoon in a kitchen weighs exactly 4.2 grams.
Not every substance called a sugar has the same calorie treatment
The simple 4-calorie-per-gram rule applies to traditional sugars such as sucrose. The FDA notes that allulose and some other sugars can be metabolized differently and may receive different calorie and sugar-label treatment. Sugar alcohols and high-intensity sweeteners are separate categories again. Evidence and labeling rules for one sweetener should not be generalized to all sweeteners.
Does “No Added Sugar” Mean “Sugar-Free”?
No. “No added sugar” and “sugar-free” answer different questions. A food can contain naturally occurring sugars and still have no added sugars. Plain milk contains lactose; fruit contains naturally occurring sugars. A product made from those foods can therefore have Total Sugars above zero while Added Sugars is zero, depending on its ingredients and the applicable labeling rules.
Conversely, pure table sugar is essentially all sugar and, when consumed as a sweetener, counts toward added-sugar intake. The words on the front of a package should always be checked against the actual Nutrition Facts panel and ingredient list.
Is Naturally Occurring Sugar Chemically Different From Added Sugar?
Sometimes the individual molecules are identical. Sucrose is sucrose whether it was already present in a plant tissue or was refined and added to a recipe. Glucose and fructose do not acquire a new molecular identity because they were “natural” or “added.” The nutrition-label distinction describes source and use within the food, while the food matrix and the rest of the diet determine the broader nutritional context.
This is why “natural sugar” is not a precise substitute for the FDA term Added Sugars, and why a statement about one purified sugar should not automatically be applied to intact fruit, milk, juice, honey, syrup, or a mixed food.
For the molecule-level distinction between glucose in food, glucose produced during digestion, and glucose used in metabolism, see Glucose: What It Is, Where It Comes From, and How the Body Uses It.
Current Guidance: Label Daily Value, U.S. Dietary Guidance, and WHO Guidance
Three different numbers can appear in sugar discussions because they serve different purposes.
First, the FDA Nutrition Facts label uses a Daily Value of 50 grams for Added Sugars on a 2,000-calorie reference diet. That number is a standardized labeling reference that helps interpret a serving; it is not an individualized medical target.
Second, the current Dietary Guidelines for Americans, 2025–2030 changed the federal presentation of added-sugar guidance. The guideline document states that one meal should contain no more than 10 grams of added sugars and recommends limiting highly processed foods, added sugars, and refined carbohydrates. The official guideline PDF is the source for that meal-level wording.
Third, WHO guidance uses the broader free-sugars category and recommends less than 10% of total energy, with a suggested reduction below 5% for additional benefit. These frameworks should not be collapsed into one number because the definitions and purposes differ.
The Psychology of Sugar Numbers: Why the Same Grams Can Feel Different
Sugar nutrition facts are numerical, but people do not process nutrition information as neutral calculators. The format, reference frame, and surrounding claims influence what a number means to a reader. That makes label comprehension a genuine psychology issue, especially when grams, percentages, serving sizes, and front-of-package language compete for attention.
Grams are precise but not always intuitive
A person may know that a drink contains 24 grams of added sugar without knowing whether 24 grams is a little or a lot in the context of the label. A randomized experiment in 2,509 U.S. adults found that adding interpretive context such as %DV or high/medium/low wording improved understanding compared with showing added-sugar grams alone. Khandpur, Graham, and Roberto (2017) therefore provides direct evidence that presentation can change comprehension even when the underlying nutrient amount is unchanged.
Interpretive labels can change understanding and choice
A systematic review and meta-analyses by Scapin and colleagues included 23 studies and 39 comparisons. Interpretive “high in sugar” text and warning formats generally improved understanding, while health warnings, teaspoon graphics, and warning signs were among the formats associated with choosing products containing less sugar. The evidence supports a modest but important point: communication design changes how easily consumers translate sugar data into a judgment.
One nutrient can become a shortcut for the whole product
The added-sugars line can improve knowledge without becoming a complete measure of food quality. In a randomized experiment of 1,156 U.S. adults, the updated Nutrition Facts label improved understanding of added sugars, but purchase-intention effects differed by product; the authors also observed a possible unintended shift toward a product low in added sugars but high in refined carbohydrate. Khandpur, Rimm, and Moran (2020) illustrates why one salient nutrient can become a mental shortcut.
Practical implication: read the added-sugars line for what it tells you, then return to the rest of the label. Total carbohydrate, fiber, protein, saturated fat, sodium, serving size, ingredients, and the nature of the food still matter. “Low added sugar” is information about added sugar, not a universal health verdict.
Naturalness, Color, and the Health Halo
Brown, raw, organic, cane, coconut, or less-refined language can create expectations that a sugar is nutritionally different before a person checks the actual label. Some sugars do contain small amounts of minerals or molasses components that refined white sugar does not, and different sugars can have different moisture, flavor, crystal size, and culinary behavior. Those differences should be evaluated directly rather than inferred from a “natural” image.
This article uses white granulated table sugar as its nutritional reference. Brown sugar, raw sugar, cane sugar, and alternative sweeteners have their own search intents and should be compared using their own composition and serving-size data. A darker color or more rustic package does not, by itself, tell you how many calories or grams of sugar are in a serving.
Sugar in Drinks and Recipes: A Practical Calculation
If you add table sugar yourself, you can estimate its contribution before it disappears into the food or drink. One teaspoon is about 4.2 grams and about 16 calories. Two teaspoons are about 8.4 grams and about 32 calories. Three teaspoons—one tablespoon—are about 12.6 grams and about 48–49 calories.
For a recipe, multiply the amount of sugar used by its approximate gram weight, then divide by the number of portions if you want an average per portion. The result is an estimate because actual portion sizes and spoon weights vary. For packaged foods, use the package Nutrition Facts panel rather than reconstructing the manufacturer’s calculation.
What Sugar Nutrition Facts Do Not Tell You
A nutrition label describes the food, not the person eating it. It does not diagnose diabetes, insulin resistance, ADHD, an eating disorder, or any other condition. It does not tell you a personal blood-glucose target, fasting glucose range, A1C goal, insulin dose, or continuous glucose monitor strategy.
Those are medical questions and belong to clinical guidance. This article stays with food composition, U.S. food labeling, general dietary guidance, and the psychology of interpreting nutrition information.
Common Questions About Sugar Nutrition Facts
How many calories are in 1 teaspoon of sugar?
About 16 calories for a level teaspoon of granulated sugar weighing about 4.2 grams in the USDA reference.
How many carbohydrates are in 1 teaspoon of sugar?
About 4.2 grams. Granulated table sugar is almost entirely carbohydrate.
How many calories are in 1 tablespoon of sugar?
About 48–49 calories, using three teaspoons or roughly 12.6 grams as an estimate.
Is table sugar 100% carbohydrate?
It is very close. The USDA SR28 reference lists 99.98 grams of carbohydrate per 100 grams of granulated sugar, with 99.80 grams of total sugars.
Does sugar have fat or protein?
Ordinary refined granulated sugar contains essentially zero fat and zero protein. Its calories come from carbohydrate.
Does sugar have fiber?
Refined granulated table sugar contains 0 grams of dietary fiber in the USDA reference.
Why does Total Sugars not have a % Daily Value?
The FDA has not established a Daily Value for Total Sugars because no recommendation has been set for one total amount covering both naturally occurring and added sugars. Added Sugars does have a Daily Value.
Is all sugar on a label added sugar?
No. Total Sugars can include naturally occurring sugars and added sugars. The separate Added Sugars line tells you how much of the total meets the FDA added-sugar definition.
Does pure table sugar count as added sugar?
Yes for U.S. Nutrition Facts labeling and dietary accounting. FDA includes foods packaged as sweeteners, such as table sugar, in Added Sugars, with special label presentation rules for single-ingredient sugars and syrups.
Is “no added sugar” the same as “sugar-free”?
No. A food can contain naturally occurring sugars while containing zero added sugars. “No added sugar” therefore does not mean zero Total Sugars.
Are free sugars the same as added sugars?
No. WHO free sugars and FDA Added Sugars overlap but use different definitions. WHO free sugars include sugars in honey, syrups, fruit juices, and fruit juice concentrates in addition to sugars added by manufacturers, cooks, or consumers.
Can I calculate every sweetener at 4 calories per gram?
No. The 4-calorie rule works for traditional sugars such as sucrose. Some sugars, sugar alcohols, and non-sugar sweeteners have different energy values and labeling rules. Check the specific substance rather than generalizing from table sugar.
Is the FDA 50-gram Added Sugars Daily Value a personal recommendation?
It is a standardized reference used on Nutrition Facts labels for a 2,000-calorie diet. Individual energy and nutrition needs vary, and the current Dietary Guidelines for Americans also uses meal-level added-sugar guidance rather than treating 50 grams as a personal goal.
Is this the same as blood sugar?
No. “Sugar nutrition facts” describes dietary sugar in foods. Blood glucose measurements, A1C, hyperglycemia, hypoglycemia, continuous glucose monitoring, and diabetes treatment are separate medical topics.
The Bottom Line
Granulated table sugar is almost pure sucrose and almost pure carbohydrate. A teaspoon is about 4.2 grams and about 16 calories; a tablespoon is about 12.6 grams and about 48–49 calories. It contains essentially no fiber, protein, or fat. On U.S. labels, Total Sugars includes all sugars in a serving, while Added Sugars identifies the portion that meets the FDA added-sugar definition. Pure table sugar itself counts as Added Sugars because it is packaged as a sweetener.
The most useful way to read sugar information is to keep the denominator visible: serving size first, then Total Carbohydrate, Total Sugars, Added Sugars, and % Daily Value. The psychology of labeling matters because grams without context are harder to interpret, while a single salient number can also become an overly broad shortcut. A Nutrition Facts label works best as a structured set of information, not as a one-number verdict on the whole food.
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References
Khandpur, N., Graham, D. J., & Roberto, C. A. (2017). Simplifying mental math: Changing how added sugars are displayed on the Nutrition Facts Label can improve consumer understanding. Appetite, 114, 38–46. DOI: 10.1016/j.appet.2017.03.015. PubMed
Khandpur, N., Rimm, E. B., & Moran, A. J. (2020). The influence of the new US Nutrition Facts Label on consumer perceptions and understanding of added sugars: A randomized controlled experiment. Journal of the Academy of Nutrition and Dietetics, 120(2), 197–209. DOI: 10.1016/j.jand.2019.10.008. PubMed
Scapin, T., Fernandes, A. C., Curioni, C. C., Pettigrew, S., Neal, B., Coyle, D. H., Rodrigues, V. M., Bernardo, G. L., Uggioni, P. L., & Proença, R. P. C. (2021). Influence of sugar label formats on consumer understanding and amount of sugar in food choices: A systematic review and meta-analyses. Nutrition Reviews, 79(7), 788–801. DOI: 10.1093/nutrit/nuaa108. PubMed
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