Quick answer: one small corn tortilla (about 25g) has roughly 50 calories, 10g carbs, 1.5g fibre and 1g protein. It is naturally gluten-free and runs 30–40% fewer calories than a flour tortilla of the same size, which makes it the lighter pick for tacos.
What Is a Corn Tortilla?
Corn tortillas are thin flatbreads made from masa — corn that has been cooked and steeped in an alkaline solution, traditionally limewater — plus water and salt. That alkaline step is called nixtamalization, and it is the most interesting thing about this food nutritionally. More on it below.
Corn Tortilla Nutrition Facts
Per 47g serving (about 2 small tortillas):
| Nutrient | Amount | % Daily Value* |
|---|---|---|
| Calories | 100 | — |
| Total Fat | 1.5 g | 2% |
| Cholesterol | 0 mg | 0% |
| Sodium | 10 mg | <1% |
| Total Carbohydrates | 20 g | 7% |
| Dietary Fibre | 3 g | 12% |
| Total Sugars | 2 g | — |
| Added Sugars | 0 g | — |
| Protein | 2 g | 4% |
| Phosphorus | 9% DV | — |
| Magnesium | 6% DV | — |
| Iron | 4% DV | — |
| Calcium | 2% DV | — |
Per one small tortilla (about 25g)
- Calories: ~50
- Carbohydrates: ~10 g
- Fibre: ~1.5 g
- Protein: ~1 g
- Fat: ~0.5 g
Nixtamalization: Why Masa Beats Plain Cornmeal
Most articles about corn tortillas skip this, and some get it backwards by describing masa production as causing “nutrient loss”. The opposite is closer to the truth.
Soaking corn in an alkaline solution does three useful things:
- Releases niacin (vitamin B3). In untreated corn, niacin is bound in a form the body cannot absorb well. Nixtamalization frees it. This is not a trivia point — populations that adopted corn as a staple without the alkaline step historically developed pellagra, the niacin-deficiency disease, while those using traditional masa methods did not.
- Adds calcium. Some of the lime is retained in the masa, which is why corn tortillas contribute calcium where plain cornmeal contributes almost none.
- Improves protein quality and texture, and makes the masa bind so it can be pressed into tortillas at all.
So a corn tortilla is not simply “corn, flattened”. It is a processed food where the processing genuinely improves the nutrition — an unusual case worth knowing about.
Health Benefits
1. Lower in calories than flour tortillas
Corn tortillas typically carry 30–40% fewer calories than flour tortillas of the same size, mostly because flour tortillas contain added fat.
2. Naturally gluten-free
Corn contains no gluten, so tortillas made purely from masa are suitable for a gluten-free diet. Two cautions if you have coeliac disease, because “naturally gluten-free” and “safe for coeliacs” are not the same claim:
- Some commercial tortillas sold as “corn” contain added wheat flour. Read the ingredient list, not just the name on the front.
- Corn is frequently milled and packed in facilities that also handle wheat, so cross-contact is a real risk. If you have coeliac disease, buy tortillas explicitly labelled gluten-free, and be aware that restaurant tortillas may share a fryer or griddle with flour ones.
3. A source of fibre
Around 1.5g per small tortilla, or 3g for a two-tortilla serving — about 12% of the daily value. Useful, though not a high-fibre food on its own.
4. Easy portion control
Tortillas come in fixed, small units, which makes them simpler to count than sliced bread of varying thickness.
Corn Tortilla vs Flour Tortilla
| Per 1 small tortilla | Corn | Flour |
|---|---|---|
| Calories | ~50 | ~90 |
| Carbs | 10 g | 15 g |
| Fat | 0.5 g | 2.5 g |
| Fibre | 1.5 g | 1 g |
| Gluten-free | Yes | No |
Tortillas vs Chips vs Shells
This is the comparison that matters most, and it is about frying rather than corn:
| Product | Serving | Calories | Fat |
|---|---|---|---|
| Soft corn tortillas | ~44–47 g (2) | 90–100 | 1–1.5 g |
| Tortilla chips | 28 g | ~140 | ~6 g |
| Fried taco shells | 28 g (2) | ~140 | ~7 g |
Blue versus yellow corn makes very little practical difference — blue corn carries somewhat more anthocyanins, but the amounts are small relative to everything else on the plate.
Things to Watch
- Corn allergy exists but is uncommon, and corn is not one of the major allergens requiring declaration in the US or EU. If you react to corn, avoid it — but this is a rarer situation than allergy to wheat, milk or nuts.
- Added wheat flour in some commercial “corn” tortillas — check the ingredients if you avoid gluten.
- Not a protein source. At 1–2g per tortilla, pair with beans, eggs, chicken or fish.
- Preparation drives the numbers. Warming a tortilla dry keeps it at ~50 calories; frying it does not.
Using Them Well
- Warm on a dry pan rather than frying in oil.
- Pair with lean protein — grilled chicken, fish, or beans.
- Two to three small tortillas is a normal meal portion.
- Keep sealed in the fridge and use within about a week of opening.
3 Nutrition Facts About Corn Tortillas
Final Takeaway
Corn tortillas are a light, gluten-free, genuinely well-processed staple that works in most eating patterns. The things that change the picture are frying and what you fill them with — not the tortilla itself.
FAQ about Corn Tortilla Nutrition
Corn contains no gluten, so tortillas made purely from masa are gluten-free. If you have coeliac disease, buy ones labelled gluten-free — some commercial “corn” tortillas contain added wheat flour, and corn is often milled in facilities that also handle wheat.
They are lower in calories and fat than white bread at a typical portion. Wholegrain bread is comparable or better on fibre, so it depends which bread you are comparing.
A small 6-inch tortilla has around 10g of carbs; a larger 8-inch one is roughly double that. Sizes vary considerably between brands, so check the packet if you are counting.
Masa is made by soaking corn in an alkaline solution, a process called nixtamalization. It releases niacin that is otherwise bound and unabsorbable, adds calcium from the lime, and improves protein quality — so the processing genuinely improves the nutrition.
No. Chips and hard taco shells are fried, carrying roughly four to seven times the fat of soft tortillas at a smaller serving weight. Baked versions sit in between.
In moderation. At about 10g of carbs each they are lower-carb than most bread, but two or three still adds 20–30g. They do not fit a strict keto allowance easily.
Blue corn contains more anthocyanins, but the practical difference is small. Choose on flavour rather than expecting a health advantage.
Keep them sealed in the fridge and use within about a week of opening. They also freeze well — separate with baking paper so they do not stick.
Sources
- Celiac Disease Foundation — Gluten-free foods and grains
- Harvard T.H. Chan School of Public Health — Carbohydrates
- American Culinary Federation — Corn and masa
Last updated: August 2026. Nutrition figures are approximate and vary by brand and tortilla size — check the packet. This article is general information, not medical or dietetic advice. If you have coeliac disease or a food allergy, rely on the product label and your clinician’s guidance rather than general articles.
