Overview and answer
A large ear of corn typically provides about 80 to 110 calories when eaten as a boiled or steamed kernel portion, and roughly 100 to 130 calories when measured as a roasted ear with minimal added ingredients. These ranges reflect variation by ear size, kernel depth, and whether measured with or without the cob. Most nutrition data for a plain large ear of corn cite around 90 to 100 calories for the kernels from a typical market ear weighing approximately 150 to 200 g. The following profile explains how to estimate calories accurately in different preparations and home contexts.
Calorie ranges by portion and preparation
Kernels only (per 100 g)
Corn kernels are low in fat and moderately starchy, yielding roughly 340 to 360 kcal per 100 g of raw kernels. Boiling or steaming retains most of this energy density, while adding butter, salt, or sugary toppings increases calories beyond the base kernel values. A market ear with substantial kernels commonly weighs 150–200 g before cooking, translating to roughly 90–100 calories from the kernels alone in a large ear portion.
Whole ear, boiled or steamed
When cooked with the cob and minimal seasoning, a large ear of corn often supplies 80–110 calories. The cob itself contributes negligible digestible calories, so nearly all energy comes from the kernels. Weights near 170–200 g after light trimming align with the typical calorie range cited for restaurant and home sides.
Roasted or grilled ear
Roasting concentrates flavor and can slightly reduce water weight, so a roasted large ear may test toward the upper end of the 100–130 calorie band. If brushed with oil, butter, or sugary coatings, calories can increase noticeably; in those cases the preparation, not the corn itself, drives the higher total.
Variables that change the calorie count
Three main variables shift calories in a large ear of corn: kernel development (larger, deeper kernels add calories), preparation method (boiled versus roasted and added fats or sugars), and serving definition (with or without cob, single ear versus measured kernel cup). Sweet corn and standard field corn are nutritionally similar at this portion scale, while additives like butter or salt raise sodium and calories without altering the base starch energy.
Practical measurement methods
Weigh kernels at home
For precise tracking, remove kernels from the cob and weigh them. Use a kitchen scale to record grams and apply the roughly 3.4–3.6 kcal per gram for raw kernels. This method removes guesswork from portion size and preparation variables.
Use standard cup measures
One cup of corn kernels, whether fresh, frozen, or canned (drained), is generally equivalent to about 120–130 calories. A large ear that yields close to one cup of kernels can therefore be estimated at roughly 120 calories if lightly prepared.
Restaurant and packaged labels
Chain restaurants often list a plain medium or large side as approximately 100–130 calories; frozen or canned products show values per labeled serving. Check labels for added fats or sugars, because these are the primary drivers of higher totals beyond the inherent corn calories.
Quick reference table
| Item | Verified detail or range | Source type |
|---|---|---|
| Raw corn kernels, 100 g | 340–360 kcal | USDA FoodData Central |
| Large ear (kernels only), cooked | 90–110 kcal | USDA and market weights |
| Large ear, boiled or steamed | 80–110 kcal | Standard restaurant data |
| Large ear, roasted with oil | 100–130+ kcal | Varies by added fats |
| One cup corn kernels | ~120–130 kcal | USDA and labeled values |
Common questions
Does the cob add calories? The cob is mostly cellulose and lignin, so it provides negligible digestible calories; almost all energy in a large ear of corn comes from the kernels.
Do sweet varieties differ much in calories? Sweet corn and standard field corn have similar calorie density per kernel; sweetness comes from sugars that slightly affect total carbohydrate but not overall energy by a large margin at typical ear sizes.
How can I estimate calories without a scale? Use cup measures, compare to labeled frozen or canned products, or rely on the 120–130 calorie ballpark for a lightly prepared large ear with kernels only.
Takeaway
A large ear of corn is a moderate-calorie, starchy vegetable option delivering roughly 90–110 calories from kernels when boiled or steamed, and 100–130 calories when roasted, before generous additions of fats or sugary toppings. For consistent tracking, weigh kernels or rely on cup-based estimates, and read labels for prepared or frozen formats. Preparation choices and portion definition are the biggest factors affecting the final calorie count.