Calories in Oatmeal
Plain cooked oatmeal contains 71 kcal per 100g. A standard breakfast portion (1 cup cooked, ~234g) is 166 kcal. Restaurant or instant flavored oatmeals add 100-300+ kcal.
Nutrition by portion size
| Portion | kcal | Carbs (g) | Protein (g) | Fat (g) | Fiber (g) |
|---|---|---|---|---|---|
| 1 cup plain cooked oatmeal (~234g) | 166 | 28 | 5.9 | 3.6 | 4 |
| 1 packet instant flavored oatmeal (43g) | 160 | 32 | 3 | 2 | 2.5 |
| Starbucks oatmeal (without toppings) | 160 | 28 | 5 | 2.5 | 4 |
| Starbucks oatmeal with brown sugar + nuts | 290 | 50 | 8 | 8 | 6 |
| Overnight oats (1 cup oats + milk + fruit + chia) | 380 | 55 | 14 | 12 | 10 |
| 100g cooked oatmeal | 71 | 12 | 2.5 | 1.5 | 1.7 |
Glycemic index
55
About these numbers
Oatmeal calorie content varies enormously based on preparation. Plain cooked oats are calorically modest (~166 kcal per cup); add toppings — milk, fruit, honey, nuts, brown sugar — and the meal easily reaches 400-500 kcal. Instant flavored varieties contain 8-12g of added sugar per packet, doubling the carb load and tripling the glycemic load vs plain oats.
Use the calculators
- Calorie Deficit Calculator — find how this portion fits your daily target
- Glycemic Load Calculator — compute exact GL for any serving size
- Macro Calculator — set protein, carb, fat splits for cut/maintain/bulk
- Net Carbs Calculator — useful for keto and T1D insulin dosing
Related foods
Frequently asked questions
- How many calories in a bowl of oatmeal?
- Plain cooked: 166 kcal per cup. Instant flavored: 160 kcal per packet. Starbucks oatmeal with toppings: 290 kcal. Overnight oats with fruit/milk/chia: 380 kcal. The toppings drive the calorie variation more than the oats themselves.
- Is oatmeal good for weight loss?
- Plain oats: excellent (high fiber, high satiety, moderate calorie density). The 2013 Rebello study showed oatmeal at breakfast reduced subsequent meal intake by ~30%. Flavored instant oats: less ideal (added sugar reduces satiety benefit). For weight loss: plain steel-cut or rolled oats, topped with berries and Greek yoghurt.
- Steel-cut vs rolled vs instant oats?
- Steel-cut: lowest GI (~55), most chew, ~165 kcal per cooked cup. Rolled: GI ~62, quick to cook, 166 kcal per cup. Instant: GI ~79, fastest but largest glucose spike. Calorie content similar; glucose response substantially different.
- Diabetes-friendly oatmeal?
- Yes, with the right type and toppings. Steel-cut or rolled (avoid instant flavored). Top with berries, nuts, and Greek yoghurt — not honey or brown sugar. The beta-glucan content provides modest glucose-lowering benefit (FDA-recognised health claim).
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