Lemon Nutrition Facts: Calories, Vitamins & Minerals
Lemon nutrition facts per 100 g and per serving
| Nutrient | Per 100 g | Serving: slice for tea, 10 g |
|---|---|---|
| Calories | 29 kcal | 2.9 kcal |
| Energy (kilojoules) | 121 kJ | 12 kJ |
| Protein | 0.9 g | 0.1 g |
| Fat | 0.1 g | 0 g |
| incl. saturated | 0 g | 0 g |
| Total carbohydrates | 9.3 g | 0.9 g |
| incl. sugars | 2.5 g | 0.3 g |
| incl. fiber | 2.8 g | 0.3 g |
| Salt | 0 g | 0 g |
*Where the numbers come from
Values per 100 g as eaten, averaged from food composition tables (USDA FoodData Central and others) and rounded — a specific brand or recipe will differ a little. Carbohydrates are total carbohydrate, fiber included, as on a US Nutrition Facts label.
29 kcal (121 kJ) per 100 g · P/F/C 0.9/0.1/9.3 g
Serving (slice for tea, 10 g) — 2.9 kcal (12 kJ) · Nutri-Score A
Per 100 g: sugar: low saturated fat: low salt: low fiber: low
Are lemons healthy?
Yes. On their nutrient profile, lemons are a healthy choice: grade A on the open 2023 Nutri-Score algorithm, the top grade.
For
- Low in calories: 29 kcal per 100 g, so a serving (slice for tea, 10 g) is 3 kcal.
- All green on the traffic light: 2.5 g sugar, 0 g salt and 0 g saturated fat per 100 g.
A typical serving (slice for tea, 10 g) has 3 kcal, 0.1 g protein, 0 g fat and 0.9 g carbs. Other weights in the table.
How we judge this, and the sources
The answer comes from the food's composition, not from opinion: its Nutri-Score grade on the open 2023 algorithm, a traffic light for sugar, salt, saturated fat and fiber per 100 g, and the share of daily reference amounts in a typical serving (for salt, sugar, fiber and vegetables, those of the WHO). It rates the food's nutrient profile; it is not medical advice. Formulas, thresholds and every source are on the methodology page; last checked against the sources on November 1, 2026. The short food description was written by our language model (AI) — how we check the text.
More about this food
Nobody eats lemons by the pound; their value is flavor without calories — juice and zest can stand in for salt and sugar in dressings.
protein 12%fat 3%carbs 85%
Vitamins and minerals in lemon
Per 100 g, the standouts are vitamin C — 53 mg, 59% of the Daily Value.
| Nutrient | Per 100 g | Serving: slice for tea, 10 g | % DV |
|---|---|---|---|
| Vitamin C | 53 mg | 5.3 mg | 6% |
| Thiamin (B1) | 0.04 mg | 0 mg | 0% |
| Vitamin B6 | 0.08 mg | 0.01 mg | 0% |
| Folate (B9) | 11 mcg | 1.1 mcg | 0% |
| Potassium | 138 mg | 14 mg | 0% |
| Calcium | 26 mg | 2.6 mg | 0% |
| Iron | 0.6 mg | 0.06 mg | 0% |
| Copper | 0.04 mg | 0 mg | 0% |
*Where the vitamin numbers come from
Vitamins and minerals come from the USDA FoodData Central record “Lemons, raw, without peel” (FDC ID 167746, SR Legacy; public domain), checked October 14, 2026; the record was matched to this food by calories, protein and fat. % DV is per serving, against the FDA Daily Values used on Nutrition Facts labels (2,000-calorie diet). The table lists nutrients that reach at least 2% DV per 100 g; the rest are absent or trace. Varieties, seasons and brands differ, and cooking in water leaches some vitamin C and B vitamins.
Lemon calories by weight, 5–50 g
15 g of lemon has 4.4 calories and 20 g has 5.8. The table gives protein, fat and carbs for each weight; for any other amount, type your own into the calculator below.
| Weight | Kcal | P / F / C, g | Fiber, g |
|---|---|---|---|
| 5 g | 1.5 | 0 / 0 / 0.5 | 0.1 |
| 10 g — typical serving | 2.9 | 0.1 / 0 / 0.9 | 0.3 |
| 15 g | 4.4 | 0.1 / 0 / 1.4 | 0.4 |
| 20 g | 5.8 | 0.2 / 0 / 1.9 | 0.6 |
| 30 g | 8.7 | 0.3 / 0 / 2.8 | 0.8 |
| 50 g | 15 | 0.5 / 0.1 / 4.7 | 1.4 |
Free to reuse with a link to the source, CC BY 4.0
Calories in lemon by serving
| Measure | Kcal | P / F / C, g |
|---|---|---|
| slice for tea, 10 g | 2.9 | 0.1 / 0 / 0.9 |
| half, 50 g | 15 | 0.5 / 0.1 / 4.7 |
How we count
Piece weights are averages. Spoons are level US measures: 1 tsp = 4.9 ml, 1 tbsp = 14.8 ml, 1 cup = 240 ml; the weight follows the density of the food (USDA FoodData Central measure weights). The diary uses the same measures — log a portion in pieces, spoons or grams.
Try it with your numbers
Portion → calories and macros
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Lemon: swaps and alternatives
No need to swap: lemons already get grade A, the top of the scale, and nothing is in the red on the per-100 g traffic light: sugar 2.5 g (red is over 22.5 g), saturated fat 0 g (over 5 g) and salt 0 g (over 1.5 g). We only suggest a swap when it fixes a real problem. How we pick swaps.
Equally good alternatives
Same food group and the same place on the plate, with a Nutri-Score grade at least as good. Figures are for 10 g, a typical serving of lemon.
| Food | Grade | Kcal | Protein, g | Fiber, g |
|---|---|---|---|---|
| Lemon | A | 2.9 | 0.1 | 0.3 |
| Watermelon | A | 3 | 0.1 | 0 |
| Limes | A | 3 | 0.1 | 0.3 |
| Cranberries | A | 2.8 | 0.1 | 0.3 |
Lemon vs similar foods: calories compared
| Per 100 g | Kcal | P / F / C, g |
|---|---|---|
| Lemon | 29 | 0.9 / 0.1 / 9.3 |
| Strawberries | 32 | 0.7 / 0.3 / 7.7 |
| Melon | 34 | 0.8 / 0.2 / 8.4 |
| Cantaloupe | 34 | 0.8 / 0.2 / 8.8 |
| Blackberries | 36 | 1.4 / 0.5 / 11 |
| Honeydew Melon | 36 | 0.5 / 0.1 / 9.1 |
| Peaches | 39 | 0.9 / 0.3 / 10 |
FAQ
How many calories are in 100 g of lemon?
100 g of lemon has 29 calories, with 0.9 g protein, 0.1 g fat and 9.3 g carbohydrates (2.8 g fiber).
How many calories are in a serving of lemon?
A serving (slice for tea, 10 g) has 2.9 calories: 0.1 g protein, 0 g fat and 0.9 g carbs.
What are the macros of lemons?
Per 100 g: 0.9 g protein, 9.3 g carbs and 0.1 g fat. By calories that's about 12% protein, 85% carbs and 3% fat.
What vitamins and minerals are in lemon?
Per 100 g, lemon is richest in vitamin C (53 mg, 59% DV) — from USDA FoodData Central record 167746.
How much fiber is in lemons?
100 g of lemon has 2.8 g of fiber; a serving (slice for tea, 10 g) has 0.3 g — 1% of the 25 g a day the WHO recommends.
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