How many calories are in fennel?

Raw fennel bulb is 31 calories per 100g. A cup sliced is 87g and 27 calories, and a whole bulb is 234g and 73. That puts it level with cabbage at 31 calories per 100g and just under kale's 35.

Is fennel seed the same as fennel bulb?

Same plant, entirely different food. The bulb is 31 calories per 100g and mostly water; the dried seed is a spice more than ten times as dense, used a teaspoon at a time. Logging a fennel salad against the seed is how a bowl of vegetables ends up reading like a bowl of granola.

Is fennel keto-friendly?

Yes. 4.2g of net carbs per 100g once 3.1g of fiber comes off, so a cup sliced is under 4g. It roasts sweet, which is worth knowing: roasted fennel tastes like it should cost far more carbs than it does.

Does fennel taste like liquorice?

Raw, mildly. The compound is anethole, the same one in aniseed and star anise. Cooking changes it: braised or roasted long enough, fennel loses most of the anise note and turns sweet and soft, closer to a gentle onion.

Can you eat fennel fronds and stalks?

Yes. Fronds are a herb, used like dill, and the stalks are too fibrous to eat but excellent in stock or under a roasting fish. The 31 calories per 100g describes the bulb only, which is fine, because the fronds weigh almost nothing.

Does fennel help with bloating?

The seed has a longer folk record here than the bulb, and the trial evidence is thin either way: small studies on fennel tea and infant colic, little else. What the bulb definitely brings is 3.1g of fiber per 100g, which can cut in either direction if bloating is the complaint.

How do you cut a fennel bulb?

Trim the stalks, halve it through the root, cut out the solid core at the base, then slice with the grain for salad or across it for roasting. A mandoline is what makes raw fennel work: paper-thin is crisp where thick is stringy.

How much potassium is in fennel?

414mg per 100g, above broccoli's 316mg and short of spinach's 557mg. A whole 234g bulb comes to roughly 969mg, and since that bulb is only 73 calories, the ratio is the argument for eating it.

How do you pick and store fennel?

Firm white bulbs, no browning at the cut end, fronds that still look alive rather than tired. It keeps about a week in the crisper. Cut fennel browns like apple, so drop slices into water with lemon if they have to wait.

All Foods

Calories in Fennel

USDA Verified · FDC 169385 · Sep 2026

27 calories

per 1 cup sliced (87g)

1.2g

Protein

7.3g

Carbs

0.2g

Fat

3.1g

Fiber

Per 100g raw

Log Fennel in one photo

That took a search. Point Calvin at the plate and it takes about three seconds, with every food listed separately so you can fix anything it got wrong.