A medium ear of sweet corn contains about 90 calories from its edible kernels, while one cup of cooked kernels contains about 120 to 125 calories. An ear provides a smaller portion than a filled cup.
You’ll find portion charts, form comparisons, topping adjustments, and a weight-based method for calculating calories in fresh, frozen, canned, and popped corn.
Corn’s Calorie Content Depends on the Edible Weight
A cup doesn’t provide a fixed weight because whole, chopped, and drained kernels pack differently. Sweet corn supplies roughly 0.8 calorie per gram, or 80 to 90 calories per 100 grams. Weighing the kernels gives you the most consistent basis for your estimate.
Moisture accounts for much of the variation among varieties. Fresh sweet corn contains water, while dry field corn has less moisture and more concentrated starch. A 100-gram portion of dry field corn therefore carries about 365 calories, far above the 80 to 90 found in sweet corn.
| Corn basis | Approximate amount | Calories |
|---|---|---|
| Plain sweet corn kernels | 100 grams | 80 to 90 |
| Cooked sweet corn kernels | 1 cup | 120 to 125 |
| Medium ear, edible kernels | 1 ear | About 90 |
| Air-popped popcorn | 1 cup | About 90 |
Sweet corn, field corn, and popcorn require separate values because their moisture and starch levels differ. Your log should identify the variety, preparation, and edible weight. That detail keeps a package serving from being confused with a standard cup or an ear.
Common Sweet Corn Portions by Cup, Ounce, and Ear
Measuring Kernels by Cup and Weight
One cup of cooked kernels usually weighs about 145 to 165 grams. At 0.8 calorie per gram, a 150-gram cup contains roughly 120 calories. Your exact result shifts with kernel size, cutting, and packing.
Your kitchen scale avoids the packing differences created by cups. A cooked ounce contains about 30 calories, so 3 ounces supply roughly 90 calories and 5 ounces supply about 150. You can scale either number to match the kernels on your plate.
| Plain sweet corn portion | Weight or basis | Estimated calories |
|---|---|---|
| Small bowl | 3 ounces, or about 85 grams | About 70 |
| Medium ear of corn on the cob | Edible kernels only | About 90 |
| Cooked kernels | 1 cup | 120 to 125 |
| Large bowl | 1.5 cups | About 180 to 190 |
Identifying the Edible Part of an Ear
The cob itself isn’t part of the calorie count because it isn’t eaten. A medium ear with about 110 grams of kernels supplies roughly 90 calories. Your edible weight is the useful measure, not the length or width of the cob.
Short, thick ears can hold more kernels than long, narrow ears, so size alone can’t set an exact total. Package directions create another measurement issue. You may see a half-cup, one cup, drained weight, dry weight, or the entire container listed as a serving.
Read both the calorie line and serving description before transferring a package value to your bowl. Your scale can separate the kernels from canned liquid, and package weight can include ingredients that never reach your plate.
Comparing Fresh, Frozen, Canned, and Popped Corn
At equal drained or cooked weights, fresh, frozen, and canned sweet corn have similar calorie levels. Processing changes moisture and convenience, but plain kernels remain close to 0.8 calorie per gram. Canned liquid and dry field corn require separate treatment.
| Form | Comparison basis | Estimated calories |
|---|---|---|
| Fresh cooked sweet corn | 1 cup of kernels | About 120 to 125 |
| Frozen cooked sweet corn | 1 cup of kernels | About 120 to 125 |
| Canned sweet corn, drained | 1 cup of kernels | 120 to 125 |
| Air-popped popcorn | 1 cup | About 90 |
| Dry field corn | 100 grams | About 365 |
Canned Corn and Popcorn
Packing liquid adds calories to canned corn, so comparisons should focus on the drained kernels. A label can describe the entire contents, including that liquid, while another part of the package may list only the solid weight. The two numbers aren’t interchangeable.
Popcorn occupies more space because heated moisture expands each small kernel. Air-popped kernels contain about 90 calories per cup, despite their volume. Oil-popped and packaged forms add fat, so a similarly filled cup can carry substantially more energy.
Field Corn and Sweet Corn
About 365 calories per 100 grams appear in dry field corn, versus roughly 80 to 90 in sweet corn. Field corn isn’t normally eaten in the same form, but the difference shows why the word “corn” cannot represent one universal portion.
Your choice of number also depends on whether you’re tracking an ear, a cup, or a package. Sweet corn, fresh corn, canned corn, frozen corn, corn kernels, and popcorn each have a different basis. Naming that basis removes most source confusion.
How Preparation and Toppings Change the Total
Cooking Plain Kernels
Boiling or steaming keeps plain kernels close to their original calorie count. Water contributes no calories, and reheating doesn’t remove the energy stored in the corn. Draining canned corn changes its weight by removing the packing liquid.
Air has the same limited role in popcorn because it supplies no dietary energy. The popped kernels provide the base calories, while oil used during popping belongs in your added total. Butter and seasoning follow the same rule.
Adding Common Toppings
Butter, oil, cheese, and creamy sauces can add more energy than the kernels themselves. One tablespoon of butter contributes about 100 calories, and 1 ounce of shredded cheese contributes roughly 110. Your portion changes faster than the plain corn portion.
| Added ingredient | Typical amount | Approximate calories added |
|---|---|---|
| Butter | 1 tablespoon | 100 |
| Olive or vegetable oil | 1 teaspoon | 40 |
| Granulated sugar | 1 teaspoon | 16 |
| Shredded cheese | 1 ounce | 110 |
| Milk | 2 tablespoons | About 20 |
| Gravy | 1/4 cup | About 70 to 100 |
A lightly seasoned ear with herbs and a small pat of butter contains roughly 110 to 140 calories. Add 100 calories from butter, 110 from cheese, and 80 from sauce, and the same ear exceeds 350 calories. The kernel amount hasn’t changed.
Once toppings are separated from the kernels, that same arithmetic can estimate portions without a standard measure.
Count the edible kernels first, then add each fat, sweetener, cheese, or sauce separately. Your total then reflects actual ingredients rather than an arbitrary serving guess.
Calculating an Estimate for an Unlisted Portion
A weight gives you a straightforward base calculation. Multiply sweet corn grams by 0.8 for an approximate calorie count. A 175-gram portion produces 140 calories through the calculation 175 × 0.8.
A package label offers another route. Divide total calories by total grams, then multiply that value by the portion you ate. A container with 240 calories and 340 grams of kernels provides about 0.71 calorie per gram, so 140 grams supplies roughly 100 calories.
Using a Three-Step Weight Method
- Weigh the kernels. Subtract your bowl’s weight from the combined weight to find the corn portion in grams.
- Select the rate. Use 0.8 calorie per gram for plain sweet corn or calculate the rate from the package’s total calories and total weight.
- Add each topping. Include oil, butter, dressing, sugar, cheese, milk, or sauce after calculating the base amount.
Your homemade bowl may weigh about 100 grams, which produces an 80-calorie base. One tablespoon of oil adds 120 calories, raising the bowl’s total to 200. The same method handles irregular portions that resist cup measurements.
Record the drained or eaten weight for canned corn, not the gross package weight. Packing liquid isn’t part of your corn portion.
Selecting a Practical Number for Your Food Log
Your food log doesn’t require exact precision for every meal. Use about 90 calories for a medium plain ear, 120 to 125 for a cup of cooked kernels, and about 90 for a cup of air-popped popcorn. Adjust the entry as portion weight or toppings change.
- Use weight for consistency. Your scale removes the packing differences that make cup measurements inconsistent.
- Separate kernels and additions. Log the corn before recording butter, oil, sugar, cheese, milk, gravy, or sauces.
- Check serving wording. Confirm whether the stated portion means drained kernels, dry weight, or package contents.
- Use a nutrient database. The United States Department of Agriculture FoodData Central lists raw, cooked, canned, and popped forms.
- Read the package panel. Its stated serving size may differ from one cup or one ear.
Corn’s Carbohydrates, Fiber, and Protein
Corn provides carbohydrates for energy, dietary fiber, and a modest amount of protein. Sweet kernels contain natural sugars, but those sugars differ from added table sugar. Your total and the foods surrounding the corn shape the balance of the meal.
One medium ear contains about 2 grams of fiber and roughly 3 grams of protein. Most of its energy comes from carbohydrates, so a plain ear remains a starch-containing food despite its plant nutrients. Its calorie total depends on the same portion and topping factors discussed above.
Your next step is to identify the corn form, weigh the edible portion, and record additions separately. Check a package label or the United States Department of Agriculture FoodData Central for a product whose weight or serving basis differs from plain sweet corn.
Key Takeaways for Accurate Corn Tracking
Your most reliable starting point is the plain edible corn: about 90 calories for a medium ear, 120 to 125 for a cup, and 0.8 calorie per gram. Weighing solves most cup errors, while separate entries for butter, oil, sugar, cheese, milk, and sauces preserve the full total.
FAQ
How many calories are in one serving of corn?
Kernels from one medium ear of sweet corn contain about 90 calories, while one cooked cup contains 120 to 125. Your exact total depends on the kernels’ weight and any butter, oil, sugar, cheese, or sauce added afterward.
How many calories are in one cup of corn?
About 120 to 125 calories are found in one cup of cooked sweet corn kernels. Fresh, frozen, and canned forms land near the same range by drained cooked weight. For canned corn, exclude the packing liquid before weighing the kernels.
How many calories are in an ear of corn?
The edible kernels on a medium ear of corn on the cob provide about 90 calories. The cob itself contributes nothing to your intake, but ear size varies. Weighing the kernels gives you a more precise number for detailed tracking.
Does corn on the cob have more calories than corn kernels?
No. Corn on the cob and loose kernels have the same calorie density per gram of edible corn. An ear with about 110 grams of kernels contains roughly 90 calories, while one cup of kernels can contain more because its portion weighs more.
How much protein is in corn?
Roughly 3 grams of protein come from a medium ear of sweet corn, or about 3 to 4 grams per cooked cup. Corn belongs mainly in the carbohydrate group, so beans, lentils, dairy, poultry, fish, or another protein source can improve the meal’s balance.
Is corn a healthy food?
Corn fits a balanced diet because it offers carbohydrates, fiber, and a modest amount of protein, and it is made without gluten. Portion size and toppings determine its calorie density, so a plain ear fits comfortably while a heavily topped bowl can carry several times as many calories.
