How many calories an onion has, raw or cooked
A medium onion has 44 calories
A medium raw onion has 44 calories. A small onion has 28 and a large one has 60.
USDA's medium onion weighs 110 g, and the portion table gives its width so you can size yours up.
USDA FoodData Central. Onions, raw. Source checked September 29, 2026.
Chopped, by the cup or the spoonful
A cup of chopped raw onion is 160 g and 64 calories. A tablespoon of chopped onion has 4 calories.
| Portion | Weight | Calories kcal | Protein g | Carbs g | Fat g | Fiber g | Sugar g | Sodium mg | Caffeine mg | Portion source |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 medium onion | 110 g | 44 | 1.2 | 10.3 | 0.1 | 1.9 | 4.7 | 4.4 | 0 | USDA portion, 1 medium, 2 1/2 inches across |
| 1 small onion | 70 g | 28 | 0.8 | 6.5 | 0.1 | 1.2 | 3 | 2.8 | 0 | USDA portion, 1 small |
| 1 large onion | 150 g | 60 | 1.6 | 14 | 0.1 | 2.5 | 6.4 | 6 | 0 | USDA portion, 1 large |
| 1 cup chopped raw onion | 160 g | 64 | 1.8 | 14.9 | 0.2 | 2.7 | 6.8 | 6.4 | 0 | USDA portion, 1 cup, chopped |
| 1 tablespoon chopped raw onion | 10 g | 4 | 0.1 | 0.9 | 0 | 0.2 | 0.4 | 0.4 | 0 | USDA portion, 1 tbsp chopped |
| 1 cup boiled onion | 210 g | 92 | 2.9 | 21.3 | 0.4 | 2.9 | 9.9 | 6.3 | 0 | USDA portion, 1 cup |
| 1 cup chopped sauteed onion | 87 g | 107 | 0.8 | 6.8 | 9.4 | 1.5 | Not reported | 10.4 | Not reported | USDA portion, 1 cup chopped |
USDA FoodData Central. Onions, raw. USDA FoodData Central. Onions, cooked, boiled, drained, without salt. USDA FoodData Central. Onions, yellow, sauteed. Source checked September 29, 2026.
Carbs and sugar in a medium onion
Most of an onion's calories are carbs. A medium onion has 10.3 g of carbs, 4.7 g of sugar and 1.9 g of fiber, with 1.2 g of protein.
Onion usually goes into something else. If that's a tray of roasted vegetables, broccoli, corn, sweet potato and baked potato have their own pages, and every other food is in the calorie references.
| Nutrient | 1 medium onion | Per 100 g |
|---|---|---|
| Calories | 44 kcal | 40 kcal |
| Protein | 1.2 g | 1.1 g |
| Carbs | 10.3 g | 9.3 g |
| Fat | 0.1 g | 0.1 g |
| Fiber | 1.9 g | 1.7 g |
| Sugar | 4.7 g | 4.2 g |
| Sodium | 4.4 mg | 4 mg |
- Calories in broccoli
- Calories in corn
- Calories in sweet potato
- Calories in a baked potato
- Calories in carrots
- Calories in tomato
- All calorie references
USDA FoodData Central. Onions, raw. Source checked September 29, 2026.
Sauteed onions carry the cooking fat
Sauteed onions have 123 calories per 100 g against 40 for raw, because they're cooked in fat. They have 10.8 g of fat per 100 g, and raw onion has 0.1 g. USDA's sauteed record doesn't list sugar.
Boiled onion has 44 calories per 100 g. A cup of boiled onion weighs 210 g, more than a cup of chopped raw onion at 160 g, because cooked onion packs down into the cup.
| Preparation | Weight | Calories kcal | Protein g | Carbs g | Fat g | Fiber g | Sugar g | Sodium mg | Caffeine mg |
|---|---|---|---|---|---|---|---|---|---|
| Raw onion | 100 g | 40 | 1.1 | 9.3 | 0.1 | 1.7 | 4.2 | 4 | 0 |
| Boiled onion without salt | 100 g | 44 | 1.4 | 10.2 | 0.2 | 1.4 | 4.7 | 3 | 0 |
| Sauteed yellow onion | 100 g | 123 | 0.9 | 7.9 | 10.8 | 1.7 | Not reported | 12 | Not reported |
USDA FoodData Central. Onions, raw. USDA FoodData Central. Onions, cooked, boiled, drained, without salt. USDA FoodData Central. Onions, yellow, sauteed. Source checked September 29, 2026.
Peel the onion, then weigh it
Peel off the papery skin, trim the ends and weigh what goes in the pan. The calculator uses raw onion, so for onion cooked in oil or butter, use the sauteed numbers above.
Onion is one part of most dishes. Describe the whole dish to TrueCal and review the estimate.
110 g has about 44 calories.
USDA FoodData Central. Onions, raw. Source checked September 29, 2026.
How many calories are in a cup of sauteed onions?
A cup of chopped sauteed onions is 87 g and 107 calories, with 9.4 g of fat from the pan.
USDA FoodData Central. Onions, yellow, sauteed. Source checked September 29, 2026.
How many calories does an onion have by weight?
Raw onion has 40 calories per 100 g. Boiled onion has 44.
USDA FoodData Central. Onions, raw. USDA FoodData Central. Onions, cooked, boiled, drained, without salt. Source checked September 29, 2026.
Log the portion you ate
Add food from a photo or a sentence, then check the portion before saving.
USDA FoodData Central. Onions, raw. USDA FoodData Central. Onions, cooked, boiled, drained, without salt. USDA FoodData Central. Onions, yellow, sauteed. Source checked September 29, 2026.