Calories in mushrooms

White button, raw. 22 kcal (92 kJ) per 100 g. Choose a portion below and every figure on the page updates.

White button mushrooms are among the lowest-energy foods you can eat, with 22 kcal (92 kJ) per 100 g raw. They are 92% water, and unusually for a vegetable, protein supplies a meaningful share of their small energy total. They contribute B vitamins such as riboflavin and niacin, plus potassium and selenium.

Where the energy comes from

Share of total energy contributed by each macronutrient, using the standard 4/4/9 kcal per gram factors:

Things worth knowing

• One medium mushroom (18 g) has about 4 kcal (17 kJ), and a cup of sliced raw mushrooms (70 g) about 15 kcal (64 kJ).
• Mushrooms shrink a lot when cooked. Boiled and drained, they come to about 28 kcal per 100 g, because the same energy is packed into less weight.
• Fat is the real variable. USDA's stir-fried white mushrooms, cooked with almost no fat, are about 26 kcal per 100 g; mushrooms fried in butter or oil soak it up and end up far higher.
• 100 g of raw white mushrooms provides about 17% of the Daily Value for selenium, plus useful amounts of riboflavin and niacin.

Converting these figures

One 1 cup, sliced of mushrooms is 15 kcal, which is 64 kJ. To convert any other figure, divide kilojoules by 4.184 for calories, or use the converter on the home page.

It takes 1,086 g of mushrooms to reach 1,000 kJ (239 kcal). See how that compares with other foods on the 1000 kJ to calories page.