One medium ear of sweet corn has about 20–24 grams of net carbs, depending on size and whether you eat every kernel.
If you track carbs, corn on the cob can feel tricky. When you type “how many net carbs in an ear of corn?” you want a clear answer that fits real plates, not lab charts.
This guide keeps the math simple and shows how net carbs change with ear size, cooking style, and portion, so you can place corn in a low carb day with less guesswork. That feels manageable.
How Many Net Carbs In An Ear Of Corn? By Size And Portion
Net carbs equal total carbs minus fiber. A medium ear of sweet corn on the cob usually lands around 20–24 grams of net carbs once the fiber is taken out of the equation. Smaller ears come in lower, larger fairground style ears come in higher.
The numbers below bring together recent nutrition data for cooked sweet yellow corn on the cob from sources that mirror USDA FoodData Central tables and other current databases. Serving sizes vary a bit by brand and variety, so treat these as ranges rather than lab values carved in stone.
| Ear Size & Type | Estimated Total Carbs (g) | Estimated Net Carbs (g) |
|---|---|---|
| Small ear, 5–6 in, boiled | 16–19 | 14–17 |
| Medium ear, 6.5–7.5 in, boiled | 22–27 | 20–24 |
| Large ear, 8 in or more, boiled | 28–34 | 25–30 |
| Medium ear, grilled, plain | 22–27 | 20–24 |
| Medium ear, with light butter | 22–27 | 20–24 |
| Half medium ear, boiled | 11–14 | 10–12 |
| One cup kernels cut from ear | 28–32 | 25–29 |
If you think of a standard summer ear, 6.5–7.5 inches long after cooking, around 20–24 grams of net carbs is a safe working range. That puts a single medium ear in the same carb neighborhood as a small baked potato, though the portion looks different on the plate.
What Net Carbs Mean For Corn On The Cob
Before you decide how much corn fits your plate, it helps to know what net carbs actually measure. Total carbohydrate on a label includes starch, sugar, and fiber. Fiber does not digest in the same way as starch and sugar, so many low carb plans count “net” carbs instead.
Net carbs are usually calculated as:
Net carbs = total carbs − fiber
Sweet corn has starch, natural sugar, and a small but helpful amount of fiber. Nutrition tables that mirror USDA data for boiled sweet yellow corn list around 18–21 grams of total carbohydrate and about 2–3 grams of fiber in a medium portion, which brings net carbs down into the high teens or low twenties per ear, depending on length and weight.
Health groups that teach carb counting, such as the American Diabetes Association, often treat one “carb choice” as about 15 grams of carbs. An ear of corn can take up more than one carb choice in that system, so it sits closer to bread or pasta than to leafy salad greens when you plan a meal.
Net Carbs In Your Corn On The Cob: Portion Guide
Not every meal comes with a perfect medium ear. Some nights you nibble half an ear beside grilled chicken, other nights you snack on loose kernels mixed into salsa. Net carbs shift with each portion, while the corn itself stays the same.
Whole Ear Versus Half Ear
A common way to think about “how many net carbs in an ear of corn?” is to ask whether you should eat the full ear or split it. Using the ranges above, you can treat a medium ear as about 20–24 grams of net carbs and a half ear as about 10–12 grams.
That split can matter if you follow a lower carb plan and want room on your plate for beans, fruit, or dessert. Sharing an ear across the table lets you taste corn without giving all of your carb budget to one side dish.
Kernels Cut From The Cob
Cutting kernels off the cob does not change total carbohydrate. The main shift is portion control. A packed cup of cooked kernels often holds a little more corn than one medium ear, so the net carbs land closer to the top of the range in the first table.
If you mix kernels into salads or grain bowls, the spoon you use for serving makes a difference. A heaping half cup of kernels will carry a share of net carbs that looks small on the plate yet matches half to three quarters of a full ear.
Fresh, Frozen, And Canned Corn
Fresh corn on the cob, frozen ears, and canned kernels all draw from the same plant. Total carbs stay in the same band across these forms when you match equal weights. The main differences sit in added salt, brine, or cream sauces.
Plain frozen ears that are boiled or steamed give numbers close to the ranges in the table. Canned cream style corn brings more free sugar into the mix, so net carbs per half cup creep higher compared with plain kernels in brine or water.
Is An Ear Of Corn Low Carb Or Keto Friendly?
Corn rarely lands on strict keto food lists, and the net carb count explains why. Many keto plans cap net carbs for the full day at around 20–30 grams. A single medium ear of corn can reach that entire limit in one side dish.
If you follow a moderate low carb style of eating, with daily carb goals between 50 and 100 grams, an ear of corn fits more easily. One ear in the 20–24 gram net carb range can sit beside a lean protein and a low carb vegetable mix while you stay near your target. The tradeoff is simple: an ear of corn means less room left for bread, rice, or dessert.
Some people with blood sugar concerns still keep corn in rotation, but they watch the rest of the plate. Protein, fat, and fiber from other foods slow the rise in blood sugar from corn, so pairing an ear with grilled chicken and a large salad feels different from pairing several ears with sweet drinks and dessert.
Net Carbs In Corn Versus Other Side Dishes
It helps to see where an ear of corn stands among other familiar sides. The table below compares rough net carb counts for common portions that show up next to grilled meat or fish. Numbers come from recent nutrition tables for cooked foods and assume no added sugar.
| Side Dish | Typical Serving | Estimated Net Carbs (g) |
|---|---|---|
| Medium ear sweet corn, boiled | 1 ear | 20–24 |
| Small baked potato with skin | 1 potato | 23–27 |
| Cooked white rice | 1/2 cup | 20–22 |
| Cooked quinoa | 1/2 cup | 16–18 |
| Cooked green beans | 1 cup | 6–8 |
| Mixed leafy salad, light dressing | 2 cups | 4–6 |
| Coleslaw, light dressing | 1/2 cup | 7–10 |
This quick compare chart shows that corn on the cob sits in the starchy side group, next to potato and rice, not down in the low carb vegetable range. That does not make corn “bad”; it simply means you treat it as a carb rich side rather than a free extra.
Ways To Fit Corn Into A Lower Carb Day
You do not have to skip corn forever just because you watch net carbs. With a bit of planning, sweet corn can stay on the grill plan or weeknight menu without blowing your numbers.
Plan Corn As Your Main Starch
One simple approach is to treat an ear of corn as the starch of the meal. Instead of piling corn beside a big spoonful of mashed potatoes and a roll, pick one starch and fill the rest of the plate with protein and non starchy vegetables.
Many people pair corn with grilled chicken, fish, or a bunless burger plus a large salad so that carbs stay in a range that feels comfortable.
Use Half Ears And Mixed Dishes
If you love the taste of corn but want fewer carbs, half ears and mixed dishes help. Serving half an ear beside grilled meat cuts the load while still giving the crunch you expect, and a spoonful of kernels stirred into tomato, onion, peppers, herbs, and lime makes a salsa that tops grilled fish or chicken.
Watch Toppings And Add Ons
Corn net carbs mostly come from the kernels themselves, not the toppings, yet butter, cheese, and sauces still matter for calories, fat, and sodium. Sweet glazes or bottled sauces can also hide added sugar.
Good flavor ideas that keep carb counts steady include:
- Brushing ears with olive oil and sprinkling salt, pepper, and smoked paprika.
- Rubbing warm ears with a wedge of lime and a light dusting of chili powder.
- Rolling corn in a small amount of crumbled cheese with herbs instead of heavy cream sauces.
Final Thoughts On Net Carbs In Corn
For most people, one ear of corn on the cob is not a problem by itself. The challenge shows up when that ear sits beside several other starches and sweet drinks. Net carb counts help you see that a medium ear of sweet corn lands in the same range as other starchy sides.
When someone asks “how many net carbs in an ear of corn?” the most honest answer is a range, not a single number. Count on about 20–24 grams of net carbs for a medium ear, a little less for small ears, and more for very large ears. Then look at the rest of your meal and decide where that ear of corn fits best for your goals and your taste.