Corn is one of the world’s most widely eaten grains, but its protein content varies surprisingly between forms — a boiled ear of sweet corn, air-popped popcorn, and whole-grain cornmeal all deliver different amounts of protein per 100 grams. This corn protein calculator helps you find the exact protein in your portion, whether you’re tracking macros, planning a vegetarian meal, or just curious about what’s on your plate.
Choose your corn form, enter the amount in grams or ounces, and the calculator instantly returns the protein grams, the per-100g value, and a clear step-by-step breakdown. Quick-fill serving buttons for a cob, a cup of kernels, popcorn, tortilla, and cornmeal make it even faster.
Use it alongside a food journal or macro tracker to build balanced meals and estimate how much corn-based foods contribute to your daily protein target.
🌽 Corn Protein Calculator
Step-by-Step Guide
Using the calculator takes less than a minute. First, pick the corn form that matches what you are eating: boiled sweet corn from the cob, canned or creamed corn, air-popped popcorn, cornmeal, masa flour, tortillas, hominy, or baby corn. Then enter the amount in grams, or switch the unit to ounces and the calculator converts automatically for you.
You can also load a typical portion with the serving buttons, which set both the form and the weight for you. The results panel shows the protein in your portion, the protein density of the selected food, and a short breakdown so you can see exactly how the number was reached.
- Select the closest corn form.
- Enter your portion weight in grams or ounces.
- Tap Calculate Protein.
- Read the total protein and the step-by-step breakdown.
How the Protein Content Is Calculated
This calculator uses the standard nutrition formula: multiply the weight of your portion by the protein density, then divide by 100.
Protein (g) = weight (g) × protein per 100 g ÷ 100
For example, boiled sweet corn has about 3.4 g of protein per 100 g. A 150 g portion therefore contains 150 × 3.4 ÷ 100 = 5.1 g protein. The calculator performs this single-step calculation and also converts ounces to grams when needed.
Corn protein is not a complete protein: it is relatively low in the essential amino acids lysine and tryptophan. Pairing corn with beans, dairy, or other grains helps fill that gap, which is why traditional combinations like corn tortillas with black beans or cornmeal porridge with milk are so common.
Worked Examples
Example 1: A cup of cooked sweet corn kernels. A 150 g portion of boiled yellow sweet corn contains 150 × 3.4 ÷ 100 = 5.1 g protein.
Example 2: An ounce of whole-grain cornmeal. One ounce equals 28.35 g, and whole-grain cornmeal has 8.8 g protein per 100 g. So 28.35 × 8.8 ÷ 100 = 2.5 g protein.
Example 3: Three cups of air-popped popcorn. Three cups weigh about 24 g, and air-popped popcorn has 12.6 g protein per 100 g. So 24 × 12.6 ÷ 100 = 3.0 g protein.
These examples show why the same gram weight can produce very different protein values. Dense, dry corn products like popcorn and cornmeal concentrate protein because they contain very little water, while fresh and canned corn carry more water and therefore have a lower protein density.
Standard Protein Values by Corn Form
| Corn form | Protein per 100 g | Typical portion | Protein per portion |
|---|---|---|---|
| Sweet corn, yellow, boiled | 3.4 g | 1 ear (90 g kernels) | 3.1 g |
| Sweet corn, yellow, raw | 3.3 g | 1 cup kernels (150 g) | 5.0 g |
| Sweet corn, canned, drained | 2.9 g | 1/2 cup (82 g) | 2.4 g |
| Creamed corn | 1.7 g | 1/2 cup (128 g) | 2.2 g |
| Popcorn, air-popped | 12.6 g | 1 cup (8 g) | 1.0 g |
| Cornmeal, whole-grain, yellow | 8.8 g | 1/4 cup (30 g) | 2.6 g |
| Corn masa flour | 8.4 g | 1/4 cup (30 g) | 2.5 g |
| Corn tortilla | 6.0 g | 1 medium tortilla (26 g) | 1.6 g |
| Hominy, canned | 1.5 g | 1 cup (165 g) | 2.5 g |
| Baby corn, canned | 1.9 g | 1/2 cup (62 g) | 1.2 g |
Portion weights are approximate; use a kitchen scale for the most accurate result. The table values are rounded to one decimal place and are intended for meal-planning estimates, not medical advice.
Common Mistakes to Avoid
- Weighing the whole cob including the core. Weigh only the kernels you actually eat.
- Switching between raw and cooked entries without adjusting for water. Boiling hydrates corn and slightly dilutes protein per gram, while dry products concentrate it.
- Using canned corn undrained. The packing liquid adds weight but almost no protein, so the protein percentage of the total drained portion is lower.
- Using cup measures for dense products like cornmeal without leveling the cup. Fluffy versus packed cornmeal can change the actual weight and therefore the protein.
- Assuming flavored popcorn or buttered corn has the same protein density as air-popped. Added fats and sugars change the per-100g value.
Frequently Asked Questions
How much protein is in one ear of corn? A medium cooked ear with about 90 g of kernels provides roughly 3.1 g of protein.
Is popcorn a good protein snack? Popcorn has a higher protein density per 100 g than fresh corn because it is dry and airy, but a typical one-cup serving still provides only about 1 g of protein. It can contribute to your daily protein if you eat several cups, but it remains mostly carbohydrate.
Does cooking change the protein content? Cooking changes the water content and therefore the protein percentage by weight, but the total protein in the kernels stays essentially the same. Boiled corn is slightly lower in protein per 100 g than raw corn for this reason.
Can I use this calculator for corn flour or polenta? Yes. Pick the closest form from the dropdown, or check your package nutrition label and enter the amount based on the listed protein per 100 g. For a similar tool with another staple grain, see the oat protein calculator.