How Many Calories in Oats (flakes)?

A bowl of oatmeal made from 50g of dry oat flakes cooked with water (the most common breakfast portion) has about 195 calories, with 8.5g protein, 33g carbs, and 3.5g fat. The amount of water used doesn't add calories - only volume - so a large bowl with lots of water still comes to 195 calories as long as the dry oats amount stays the same.

40g of dry (uncooked) oat flakes has about 156 calories, with 6.8g protein, 26.5g carbs, 2.8g fat, and 4.2g fiber. This is the minimum portion recommended for a filling breakfast - weigh the oats before cooking, not after, for an accurate calorie count.

50g of dry oat flakes has about 195 calories, with 8.5g protein, 33g carbs, 3.5g fat, and 5.3g fiber. This is the standard portion recommended in FitAzi plans for a balanced breakfast, especially combined with a protein source (yogurt, whey) and fruit.

100g of dry (uncooked) oats has about 389 calories, with 16.9g protein, 66.3g carbs, 6.9g fat, and 10.6g fiber. By contrast, 100g of already-cooked oatmeal (porridge with water) has only 68 calories, because the water absorbed by the flakes greatly increases the weight without adding calories - 100g of dry flakes becomes about 550g of cooked porridge.

Yes, significantly more. Oats cooked with water don't add any calories beyond what's in the dry flakes, while 200ml of semi-skimmed milk adds about 90-95 extra calories. So a bowl from 50g dry oats (195 calories) cooked with water stays at 195 calories, but the same bowl cooked with 200ml semi-skimmed milk comes to about 285-290 calories. These are average values - they depend on the exact type of milk used.

A typical serving of overnight oats, made from 50g of dry oats and 150ml of semi-skimmed milk with no toppings, has about 265 calories - an average value, since the final result depends heavily on the liquid used (water, milk, plant milk) and add-ins like fruit, honey, or peanut butter, which can easily add another 100-200 calories.