Which has more calories, onion or zucchini?

Per 100 g, onion has 40 calories and zucchini has 17. Zucchini is lower in calories.

Which has more protein, onion or zucchini?

Onion has 1.1 g of protein per 100 g; zucchini has 1.2 g. Zucchini wins on protein.

Is onion or zucchini better for weight loss?

For a calorie deficit, the lower-calorie, higher-protein option usually helps you stay full on fewer calories. Here that leans toward zucchini — but portion size matters more than which food you pick.

Calorie comparison

Onion vs Zucchini

Per 100 grams, zucchini is the lighter choice by 23 calories, while zucchini delivers more protein. The right pick depends on your goal — fewer calories for a cut, more protein to stay full.

Onion nutrition →Zucchini nutrition →

Per 100 grams

Per 100 g	Onion	Zucchini
Calories	40	17
Protein	1.1 g	1.2 g
Carbs	9 g	3.1 g
Fat	0.1 g	0.3 g

Orange highlights the "better for a calorie deficit" value (fewer calories, fat and carbs; more protein). Your goals decide what "better" means.

Per typical serving

🧅 Onion

1 medium (110 g)

44 cal

1.2 g protein · 9.9 g carbs · 0.1 g fat

🥒 Zucchini

1 cup sliced (124 g)

21 cal

1.5 g protein · 3.8 g carbs · 0.4 g fat

Frequently asked

Which has more calories, onion or zucchini?
Per 100 g, onion has 40 calories and zucchini has 17. Zucchini is lower in calories.
Which has more protein, onion or zucchini?
Onion has 1.1 g of protein per 100 g; zucchini has 1.2 g. Zucchini wins on protein.
Is onion or zucchini better for weight loss?
For a calorie deficit, the lower-calorie, higher-protein option usually helps you stay full on fewer calories. Here that leans toward zucchini — but portion size matters more than which food you pick.

More comparisons

Onion vs Carrot Onion vs Brussels Sprouts Onion vs Beets Onion vs Butternut Squash Onion vs Broccoli Onion vs Kale

Don't guess. Snap it.

Whether it's onion or zucchini, CalorieScan AI logs it from a photo in seconds.

Download for iPhone