Passion fruit is rarely the first food people think of when planning protein, but its edible seeds and pulp do contribute a small amount of protein, and every gram matters when you are tracking macros. This passion protein calculator estimates how much protein is in a serving of purple or yellow passion fruit, whether you measure in grams, ounces, or whole fruits.
Along with total protein, the tool shows protein calories and how much of your daily protein target the fruit covers. You can adjust the daily target to match your own diet, and the calculation is based on standard food-composition values for the edible portion — the pulp and seeds, not the fibrous shell.
Use it for meal planning, macro tracking, recipe work, or simply to learn how this tropical fruit fits into a balanced diet.
🧮 Passion Protein Calculator
Estimate protein in fresh passion fruit by variety and portion, then see calories from protein and daily-value coverage.
1. Fruit variety
2. Amount eaten
1 average fruit ≈ 18 g edible pulp and seeds. Weigh only the edible portion, not the shell.
3. Daily protein target (optional)
The default 50 g is a common reference on a 2,000-kcal diet. Use your own target if you track macros.
📊 Your Result
Enter an amount and press Calculate.
How the Protein Estimate Is Calculated
Passion fruit protein values come from food-composition databases that analyze the edible portion — the juicy pulp and the seeds — but not the tough outer rind. For the calculator, purple passion fruit is set to 2.2 g protein per 100 g edible portion and yellow passion fruit to 2.0 g per 100 g. The tool converts your serving to grams, multiplies by the variety's protein factor, and divides by 100:
Protein calories use the standard Atwater factor of 4 kcal per gram of protein. For a medium fruit with 18 g of edible pulp and seeds, that works out to roughly 0.4 g protein and about 1.6 kcal from protein — small, but it adds up when you eat several fruits or add pulp to smoothies and yogurt.
Sources used for reference values include the U.S. Department of Agriculture's FoodData Central and general nutrient profiles for passion fruit on Wikipedia.
Standard Protein Values
The table below lists typical values for the edible portion of fresh passion fruit. Actual values can vary with ripeness, cultivar, growing conditions, and how much seed material is included.
| Variety | Protein per 100 g | Protein per fruit (18 g) | Calories from protein per fruit |
|---|---|---|---|
| Purple passion fruit | 2.2 g | 0.40 g | 1.6 kcal |
| Yellow passion fruit | 2.0 g | 0.36 g | 1.4 kcal |
Worked Examples
Example 1 — One purple passion fruit: 18 g edible portion × 2.2 g / 100 g = 0.40 g protein. That contributes about 1.6 kcal and covers 0.8% of a 50 g daily target.
Example 2 — 100 g yellow passion fruit: 100 g × 2.0 g / 100 g = 2.0 g protein. Protein calories are 8 kcal, and it covers 4% of a 50 g daily target.
Example 3 — 3 oz purple passion fruit: 85.05 g × 2.2 / 100 = 1.87 g protein, about 7.5 kcal from protein.
Tips for Accurate Tracking
- Weigh only the edible pulp and seeds, not the shell. One average fruit yields about 18 g; large fruits can yield 25–30 g.
- If you use frozen passion fruit pulp or puree, check the label — added sugar or water lowers the protein percentage per 100 g.
- For macro counting, remember that protein from fruit is incomplete but combines well with dairy, nuts, or legumes in a meal.
- Use your own daily protein target instead of the 50 g default if you follow a specific plan, such as 0.8 g per kg of body weight.
Frequently Asked Questions
Is passion fruit a good protein source?
Compared with meat, eggs, or legumes, no. Passion fruit is primarily a source of fiber, vitamin C, and antioxidants, with only about 2 g protein per 100 g. It can still contribute a small amount to your daily total, especially if you eat large portions or use the pulp in recipes.
Does the shell contain protein?
The fibrous outer rind is not usually eaten and is not included in the standard edible-portion values. The pulp and seeds are the parts counted in the calculator.
Are yellow and purple passion fruit different nutritionally?
They are similar, but the purple variety is often slightly higher in protein and vitamin C. Green or unripe fruits and dried seeds may also differ slightly from fresh averages.
Can I use this calculator for passion fruit juice?
Not directly. Juice and nectar have lower protein per 100 g and often contain added water or sugar. If you know the protein value listed on the label, you can enter it manually using the 2.0 slot as a rough custom value.