Corn is a staple side dish, but its carbohydrate content can vary depending on how it is prepared. This corn carbs per 100g calculator helps you estimate total carbohydrates, fiber, and net carbs for any serving size — from a single ear to a cup of kernels — using standard USDA nutrition values for raw, boiled, canned, and frozen sweet corn.
Whether you are following a low-carb or ketogenic plan, counting carbs for diabetes management, or simply logging your macronutrients, this tool gives you a quick, consistent baseline. You can use the preset portion buttons for common serving sizes, or enter an exact weight in grams. If your product label has different nutrition data, switch on custom values to match your specific food.
Net carbs are calculated by subtracting fiber from total carbs. Because fiber is not digested like other carbohydrates, many low-carb eaters prefer this number when planning meals. Use the results to plan portions, compare corn forms, or track your daily carbohydrate target.
🌽 Corn Carbs Per 100g
Enter a serving weight and choose a corn form to see total carbs, fiber, and net carbs.
How to Use This Calculator
Start by choosing the corn form that matches what you're eating. The built-in values represent the edible kernel portion of sweet corn as reported by USDA FoodData Central, with total carbohydrate and dietary fiber shown per 100 grams. Next, enter the weight of your serving in grams. If you don't have a scale, the portion presets provide useful estimates: a small ear of corn usually yields about 90 g of kernels, a medium ear about 110 g, a large ear about 140 g, and a cup of cooked kernels about 145 g. Press Calculate to see total carbs, fiber, and net carbs for that serving, plus the per-100g breakdown. Use Reset to clear the results and return to the default 100 g portion.
Carbohydrate Reference for Common Corn Forms
| Corn form | Total carbs (g/100g) | Fiber (g/100g) | Net carbs (g/100g) |
|---|---|---|---|
| Sweet corn, raw | 19.0 | 2.0 | 17.0 |
| Sweet corn, boiled | 21.0 | 2.4 | 18.6 |
| Sweet corn, canned, drained | 17.2 | 2.0 | 15.2 |
| Sweet corn, frozen, boiled | 22.2 | 2.6 | 19.6 |
These are average values from the USDA FoodData Central database and may vary slightly by brand, maturity, and preparation method. Boiled or frozen corn often tests slightly higher in carbohydrates per 100 grams because cooking removes some water and concentrates the nutrients. Canned corn that is drained before serving usually has a lower carbohydrate density because the packing liquid is discarded.
How Net Carbs Are Calculated
Portion carbs = (carbs per 100 g × serving weight in grams) ÷ 100
Portion fiber = (fiber per 100 g × serving weight in grams) ÷ 100
Net carbs = portion total carbs − portion fiber
The logic is simple: fiber is a type of carbohydrate that your body doesn't fully digest into sugar in the way starch or simple sugars do. For that reason, many low-carb and keto eaters subtract fiber from total carbs to estimate the carbohydrate that will have the most noticeable impact on blood sugar. The calculated net carb value is not a scientifically standardized term, and not every health organization defines it identically, but it remains a popular planning metric.
Worked Examples
Example 1: One medium ear of boiled corn (110 g)
Carbs = 21.0 × 110 ÷ 100 = 23.1 g. Fiber = 2.4 × 110 ÷ 100 = 2.6 g. Net carbs = 23.1 − 2.6 = 20.5 g.
Example 2: Half a cup of raw kernels (72.5 g)
Carbs = 19.0 × 72.5 ÷ 100 = 13.8 g. Fiber = 2.0 × 72.5 ÷ 100 = 1.5 g. Net carbs = 13.8 − 1.5 = 12.3 g.
Example 3: 100 g canned drained corn
Carbs = 17.2 g. Fiber = 2.0 g. Net carbs = 17.2 − 2.0 = 15.2 g.
Use these examples as a sanity check when you calculate a new portion. Results may round differently depending on how many decimal places your food diary uses.
Frequently Asked Questions
Is corn a starchy or non-starchy vegetable?
Corn is botanically a grain and nutritionally considered a starchy vegetable. Its carbohydrate content is closer to potatoes, peas, and winter squash than to leafy greens or broccoli. That doesn't make it bad, but it does mean portions add up faster than low-carb vegetables. If you want a direct comparison with a non-starchy vegetable, try the broccoli carbs per 100g calculator.
Why does boiled corn have more carbs per 100g than raw corn?
Both forms start with the same kernels. Cooking drives off water and causes slight changes in density, so 100g of boiled kernels contains a slightly larger share of undiluted carbohydrate than 100g of raw kernels. The difference is modest — roughly 2g per 100g — and mostly disappears when you weigh the corn before cooking or track by the whole ear rather than by a fixed 100g serving.
Should I use net carbs or total carbs?
For keto and many low-carb diets, net carbs is the common decision number. For diabetes meal planning, some dietitians prefer total carbs because fiber's effect on blood sugar can still vary. Ask your care team which number fits your goals. If you're also tracking calories, the corn calories per cup calculator can help you estimate energy alongside your carb count.
Tip: For packaged corn products, always check the nutrition label. Added sugars, butter sauce, or cream-style processing can change the carb count well beyond the plain kernel values used here.
Additional Resources
- USDA FoodData Central — searchable nutrient data for corn and thousands of other foods.
- American Diabetes Association: Understanding Carbs — practical guidance on carb counting and meal planning.
- Harvard T.H. Chan School of Public Health: Carbohydrates — a balanced look at carbohydrate quality and health.