How Many Calories Are In Squash And Zucchini? | Smart Plate Math

Why These Veggies Are So Low Calorie

Summer squash and zucchini sit in a rare sweet spot: plenty of bite for barely any energy. Raw sliced zucchini delivers about 18 to 19 calories in a 1-cup serving (roughly 113 grams) and brings water, fiber, and a light touch of natural sugar.

A raw cup of yellow summer squash lands right beside it, at roughly 18 calories in that same 1-cup sliced size. This tiny number is why a plate piled with raw coins or thin sticks can feel like a “real snack” without blowing through your meal plan.

Now line that up with winter squash. Roast butternut cubes and you climb to about 82 calories per cooked cup (around 205 grams). That still beats a cup of mashed potatoes, but it’s far higher than raw green zucchini coins.

The gap comes down to starch. Pale green summer squash (zucchini, yellow crookneck, pattypan) is picked young, before much starch packs in. Winter squash, like butternut, grows longer and concentrates natural carbs, which raises energy per bite and gives that sweet, dense texture we use in soups and mash.

Type / Serving (Plain)	Calories Per Cup	Notes
Raw Zucchini, 1 cup sliced (113 g)	~18–19 kcal	Crisp, watery texture; low starch.
Raw Yellow Summer Squash, 1 cup sliced (113 g)	~18 kcal	Same ballpark as zucchini; mellow flavor.
Cooked Summer Squash, boiled & drained, 1 cup sliced (180 g)	~36 kcal	Water cooks off, cup packs tighter.
Butternut Squash, baked cubes, 1 cup (205 g)	~82 kcal	Orange, sweet, starchier bite.

Cooked summer squash shows almost double the calories per cup compared with raw. When heat drives off water, each forkful holds less moisture and more solids. A level measuring cup ends up holding more vegetable by weight, so the math per cup goes up.

Dietitians often point out that this “water first, starch later” pattern helps with weight control: low-energy vegetables can fill plate space, stretch a meal, and slow between-meal grazing. Zucchini shows up on many weight management lists for that reason.

Once you know your own daily calorie needs, it gets easier to see how a bowl of sautéed zucchini or roasted butternut fits into dinner without guesswork.

Calorie Numbers For Squash And Zucchini By Size And Cooking Method

Portion size matters more than people think. A single “medium” zucchini (about 196 grams) lands near 31 to 33 calories total, which means you can grill an entire one and barely add more than a splash of energy to the plate.

The classic 1-cup raw slice serving for zucchini sits under 20 calories. Summer squash in that same raw 1-cup sliced size lands under 20 calories as well. In that cup of yellow squash you’ll pick up around 1.2 grams of fiber and close to 300 milligrams of potassium, plus vitamin C in the ~20% Daily Value range.

Steam or boil those slices with no oil and drain them, and the cup shifts. Cooked summer squash at 1 cup sliced (about 180 grams now that the plant softened) gives roughly 36 calories. You’re getting the same vegetable, just denser in the measuring cup because the heat wilted it.

USDA FoodData Central tracks these servings down to the gram and lists calories, fiber, carbs, and even specific minerals for raw and cooked forms. USDA FoodData Central is the source behind most mainstream nutrition labels in apps and cookbooks.

Where Winter Squash Lands

Now turn to orange winter squash. One cooked cup of butternut cubes (about 205 grams) lands near 82 calories, about 21.5 grams of carbs, and close to 6.6 grams of fiber. That cooked cup brings a huge jolt of vitamin A — well over 400% of the Daily Value — along with vitamin C, potassium, and magnesium.

This explains why butternut tastes closer to sweet potato than raw zucchini sticks. The deep orange color signals carotenoids like beta carotene. Your body can convert beta carotene into vitamin A, which plays a direct part in night vision and normal immune defense.

Serving Size Tips For Meal Planning

Volume tricks help. Zucchini noodles (“zoodles”) are basically spiralized raw zucchini. You can fill a full pasta bowl with those ribbons for fewer than 40 calories before sauce hits the pan. The mild taste means the ribbons soak up garlic, lemon, tomato, pesto, anything. Dietitians often lean on this swap because it stretches pasta night without pushing total energy through the roof.

Spaghetti squash gives you a similar noodle move. A cooked cup of spaghetti squash strands (about 155 grams) has around 42 calories, which is only a fraction of what you’d get from a cup of cooked wheat spaghetti, often ~220 calories.

That difference matters on nights when you want a creamy sauce or cheese on top. The base “noodle” barely adds any energy. You can build a big bowl, feel like you ate pasta, and still stay calm on total intake for the meal.

What About Spaghetti Squash?

Spaghetti squash sits in the botanical squash family, but texturally it behaves like thin pasta strands once roasted or microwaved. One cooked cup brings around 42 calories, roughly 10 grams of carbs, and a couple grams of fiber, plus minerals like potassium.

People like it because it gives that “long noodle” experience without leaning on refined pasta. You can roast it cut side down, then scrape the strands with a fork and toss them with marinara or olive oil and herbs. It’s an easy way to bulk up dinner volume with fewer carbs and fewer calories than a normal pile of spaghetti.

Oil, Butter, And Sauce Matter

All the calorie numbers so far assume plain vegetables. Toss those same slices in fat and the math shoots up fast. One tablespoon of olive oil brings about 119 calories by itself, and many pans get more than a tablespoon in one pass.

This doesn’t mean you skip olive oil. Olive oil helps browning, carries herbs, and helps your body absorb fat-soluble pigments such as carotenoids from orange squash. The point is that the oil, not the vegetable, drives most of the calorie jump in a sauté.

Nutrition Benefits Beyond Calories

These vegetables are more than “low calorie sides.” A raw cup of summer squash or zucchini gives water, fiber, and minerals with hardly any sodium. That same cup supplies potassium in the ~6% Daily Value range. Potassium helps with fluid balance and can help with steady blood pressure.

Cooked butternut squash pushes the micronutrient story even harder. One cooked cup brings more than 450% of the Daily Value for vitamin A, plus about 31 milligrams of vitamin C, near 7 grams of fiber, and more than 580 milligrams of potassium.

USDA’s seasonal produce guide for zucchini lists only 33 calories for a whole medium zucchini (about 196 grams). That makes grilled zucchini planks a smart add to any dinner plate when you want bulk without blowing energy targets. USDA Zucchini Profile backs that number with lab data.

Nutrient Per Cooked Cup*	Steamed Summer Squash / Zucchini	Roasted Butternut Squash
Calories	~36 kcal (180 g cooked cup)	~82 kcal (205 g cooked cup)
Fiber	~1.2 g	~6.6 g
Potassium	~296 mg	~582 mg
Vitamin C	~19 mg (~20% DV)	~31 mg (~34% DV)
Vitamin A	Small amount	>400% DV

*Plain veg, no butter, no oil. Values pulled from USDA nutrient databases and MyFoodData, which compiles USDA lab numbers for typical household servings.

Why Fiber And Potassium Matter Here

A cooked cup of butternut cubes can land near 7 grams of fiber. Fiber slows how fast carbs hit your bloodstream, helps you stay satisfied between meals, and keeps digestion regular.

Both pale summer squash and orange winter squash bring a useful amount of potassium. Potassium helps counter sodium in the diet and can help keep blood pressure in a comfortable range. Many adults fall short on potassium, so piling roasted squash next to lean protein makes sense if you’re trying to keep salt in check without giving up flavor.

Vitamin A, Carotenoids, And Eye Health

The bold orange flesh of butternut signals beta carotene. Your body can turn beta carotene into vitamin A, which plays a direct part in low-light vision and normal immune response. USDA data shows that one cooked cup of butternut squash blows past 400% of the Daily Value for vitamin A.

How To Use Squash And Zucchini Day To Day

Raw snack plate: Cut zucchini or yellow squash into sticks and pair with hummus or Greek yogurt dip. You get crunch for almost no calories, plus water for volume.

Fast skillet side: Slice zucchini, toss it in a teaspoon of olive oil, salt, pepper, and garlic, and cook in a hot pan until browned. A teaspoon of oil runs roughly 40 calories while still coating the pan, so the vegetable itself stays in low-calorie territory.

Meal-prep bowl: Roast a tray of butternut cubes with a light spray of oil. Add beans or grilled chicken and call it lunch. That cup of orange cubes helps you feel full thanks to starch and fiber, and it brings a surge of vitamin A and potassium in one scoop.

Want a deeper walk-through on calorie budgeting during weight loss? Try our calorie deficit guide for practical math around intake targets and fat loss pacing.