Zucchini might be famous for being low in calories — a 100 g serving has only about 17 kcal — but it also quietly contributes protein to your daily total. This zucchini protein calculator converts any serving size you actually cook with, whether that's grams, ounces, cups of chopped pieces, or whole medium and large zucchini, into grams of protein using USDA reference data. You'll also see the protein calories, carbs, and how much of the daily protein value (50 g) your serving covers.
It's a handy companion for anyone tracking macros: fitness fans logging every gram of protein, dietitians planning vegetable-based meals, low-carb eaters checking their intake, or anyone curious about how plant foods add up. Because zucchini is about 95% water, small measurement errors can swing your numbers, so the calculator handles the conversions for you and even lets you switch between raw and cooked zucchini, which differ slightly in density and nutrition.
Use the quick-fill buttons for common servings, adjust the preparation method, and hit calculate to get an instant protein snapshot.
🥒 Zucchini Protein Calculator
Find the protein in any serving of zucchini — grams, ounces, cups, or whole vegetables.
Quick Start: Using the Calculator
Enter a number in the amount field, choose the unit that matches what you're actually measuring, and select whether your zucchini is raw or cooked. The calculator converts your serving to grams, then applies the protein value per 100 g from the USDA nutrient database.
Three features make it faster in the kitchen:
- The quick-fill preset buttons (1 cup, 1 medium, 1 large, 100 g) set both amount and unit in a single click, so you don't have to touch the dropdowns.
- The raw/cooked toggle swaps between two nutrient profiles: raw zucchini has about 1.21 g of protein per 100 g, while boiled, drained zucchini has about 1.14 g per 100 g.
- The copy button grabs the main protein result so you can paste it straight into a food diary, meal-planning spreadsheet, or macro-tracking app.
The result panel breaks your serving into four useful numbers: protein in grams, protein calories, percent of the daily value, and total calories plus carbs for context.
Protein in Zucchini: The Numbers
Zucchini is not a high-protein food, but it adds up across a dish. A whole medium zucchini provides roughly the same protein as one small egg white. Here are the reference figures this calculator uses for raw zucchini, based on USDA data:
| Serving | Weight | Protein (raw) | Calories |
|---|---|---|---|
| 100 g (about ¾ cup chopped) | 100 g | 1.21 g | 17 kcal |
| 1 US cup chopped | 124 g | 1.50 g | 21 kcal |
| 1 medium zucchini | 196 g | 2.37 g | 33 kcal |
| 1 large zucchini | 323 g | 3.91 g | 55 kcal |
For cooked zucchini (boiled, drained), the protein value per 100 g drops to about 1.14 g. That change is mostly a water effect: cooking removes moisture and changes nutrient concentration, but the absolute amount of protein in the vegetable stays essentially the same before and after cooking.
How the Calculation Works
The tool performs two conversions. First it turns your chosen serving into grams:
- US cup of chopped raw zucchini = 124 g
- Medium zucchini (whole, with skin) = 196 g
- Large zucchini (whole, with skin) = 323 g
- 1 ounce = 28.35 g
Then it applies the core protein formula:
Protein (g) = serving weight (g) × protein per 100 g ÷ 100
Raw zucchini: 1.21 g of protein per 100 g. Cooked zucchini: 1.14 g per 100 g. Protein calories are estimated at 4 kcal per gram of protein, and the percent daily value uses the FDA's 50 g reference for a 2,000-calorie diet.
Calories and carbs are estimated the same way, using 17 kcal and 3.11 g of carbs per 100 g for raw zucchini, and 15 kcal and 2.69 g of carbs per 100 g for cooked zucchini.
Worked Examples
Example 1: One large raw zucchini. A large zucchini weighs about 323 g. Protein = 323 × 1.21 ÷ 100 = 3.91 g. That is roughly 16 kcal of protein and about 7.8% of the daily value.
Example 2: 2 cups of chopped raw zucchini in a stir-fry. Two cups weigh about 248 g. Protein = 248 × 1.21 ÷ 100 = 3.00 g. Add chicken or tofu and the zucchini still contributes meaningfully to the bowl's total protein.
Example 3: 5 oz of cooked zucchini slices. Five ounces equals 141.7 g. Using the cooked value: 141.7 × 1.14 ÷ 100 = 1.62 g of protein. Note that cooked zucchini delivers fewer grams per 100 g than raw because the USDA bases its value on the drained, water-reduced vegetable.
Common Mistakes to Avoid
- Weighing the stem and ends. Trim both before weighing — these parts are essentially inedible and add weight without protein.
- Measuring cooked zucchini in cups. Cooked zucchini shrinks dramatically and packs more pieces per cup, so a "cup of cooked" weighs more than a "cup of raw." Weigh cooked zucchini on a scale for accurate tracking.
- Assuming zucchini covers your protein needs. At roughly 1.2 g per 100 g, you would need about 40 raw zucchini to reach a 100 g protein target. Treat it as a supporting protein source, not a primary one.
- Copying raw values into cooked recipes. If you are logging a cooked dish, use the cooked toggle — raw values will slightly overstate the protein per serving of prepared food.
- Forgetting it is mostly water. Zucchini is about 95% water, which makes it volumetrically satisfying for very few calories. That is precisely why portion-size differences matter little for calories but still matter for precise macro math.
Frequently Asked Questions
Is zucchini a complete protein? No. Zucchini contains all nine essential amino acids but only in small amounts, and it is especially limited in methionine. In practice, pair it with legumes, eggs, dairy, or meat in the same meal to cover amino acid gaps — a classic plate of zucchini with beans or chicken handles this naturally.
Does cooking destroy the protein in zucchini? No. Heat does not destroy zucchini's protein. The per-100 g value shifts from 1.21 g to 1.14 g only because boiling adds water and draining changes concentration. Quick methods like steaming, roasting, or sautéing keep both texture and nutrients intact.
What is a realistic daily protein target? The FDA labels use 50 g per day as a reference for a 2,000-calorie diet, which is the basis of the "% Daily Value" figure here. Individual needs depend on body weight and activity; general guidelines for active adults range from about 1.2 to 2.0 g per kg of body weight per day.
Can I use this calculator for yellow squash or zoodles? Yellow summer squash has a very similar protein profile (about 1.1–1.2 g per 100 g), so results will be close. For zucchini noodles, weigh the spiralized zucchini directly in grams — "cups of zoodles" vary wildly depending on how tightly they are packed.
For the underlying nutrient data used here, see the USDA FoodData Central entry for raw summer squash and the FDA's guidance on Daily Value. If you are building a salad around zucchini and want to total the whole bowl's protein, try the salad protein calculator.