Protein and vitamin C are two of the most commonly tracked nutrients, yet most people think about them separately. Protein supports muscle repair, immune function, and satiety, while vitamin C acts as an antioxidant, supports collagen formation, and helps iron absorption. This Protein & Vitamin C Calculator shows you exactly how a serving of common foods contributes to both goals at once.
Pick a food category and item, enter a serving size in grams or ounces, and the calculator instantly returns protein in grams, vitamin C in milligrams, and their percentage of the Reference Daily Intake. It also shows per-100g values so you can compare foods at a glance.
This tool is useful for athletes planning post-workout meals, people tracking macro and micronutrients, and anyone curious about the nutritional density of everyday foods. Use the quick-fill buttons for common serving sizes, and adjust the amount to match your actual plate.
⚙️ Food & Serving Details
📊 Results
How to Use This Calculator
Using the calculator takes three quick steps:
- Choose a food category. The dropdown groups foods into protein-rich choices, fruits and vegetables, legumes and grains, and dairy and eggs.
- Select a specific food item. Each item has a typical protein and vitamin C value per 100 g.
- Enter your serving size. Use grams or ounces, or tap one of the preset buttons for 100 g, 3 oz, or 150 g. The 150 g button approximates one cup for many produce items.
Click Calculate to see your serving's protein and vitamin C content, including the percentage of the Daily Value. Click Reset to clear the results and start over.
Why Protein and Vitamin C Matter Together
Protein provides amino acids that are essential for rebuilding muscle, skin, enzymes, and immune cells. Vitamin C supports collagen synthesis, which is needed for tendons, ligaments, and blood vessels; it also acts as an antioxidant and improves non-heme iron absorption from plant foods. Combining a protein source with a vitamin C-rich vegetable or fruit can make a meal more satisfying and more nutritious.
For example, a chicken salad with red bell peppers, lentils with broccoli, or Greek yogurt with strawberries all pair complementary nutrients. This calculator lets you see what each part of that pairing contributes before you build your plate.
Reference Values for Common Foods
Values below are approximate and based on standard USDA food composition data. Actual values vary by variety, cooking method, and preparation.
| Food | Protein (g / 100 g) | Vitamin C (mg / 100 g) |
|---|---|---|
| Chicken breast (cooked) | 31 | 0 |
| Salmon (cooked) | 25 | 0 |
| Egg (whole) | 13 | 0 |
| Lentils (cooked) | 9 | 1.5 |
| Greek yogurt (nonfat) | 10 | 0.5 |
| Broccoli (cooked) | 2.4 | 65 |
| Red bell pepper (raw) | 1 | 128 |
| Strawberries (raw) | 0.7 | 59 |
Notice that most animal proteins supply little vitamin C, while many fruits and vegetables supply plenty of vitamin C but little protein. That is why the calculator shows both columns at once: it makes it easier to spot which foods cover which need.
Worked Example
Example: You cook 200 g of broccoli as a side dish and want to know what it adds to your daily totals.
Broccoli (cooked) contains about 2.4 g protein and 65 mg vitamin C per 100 g. For a 200 g serving:
- Protein = 2.4 × 200 ÷ 100 = 4.8 g
- Vitamin C = 65 × 200 ÷ 100 = 130 mg
- Protein contribution = 4.8 ÷ 50 × 100 = 9.6% DV
- Vitamin C contribution = 130 ÷ 90 × 100 = 144% DV
One generous serving of broccoli already exceeds your full daily vitamin C target while contributing only a small amount of protein. Pair it with chicken, tofu, or lentils to cover both macros and micros.
Tips for Meeting Both Targets
- Use vitamin C to boost plant iron and protein quality. Have citrus, peppers, or tomatoes with beans, lentils, or spinach.
- Don't rely on animal protein for vitamin C. Meat, poultry, fish, eggs, and dairy contain little or none.
- Aim for a variety of colors. Red peppers and broccoli are vitamin C standouts; kiwi, strawberries, and citrus are excellent quick options.
- Watch portion sizes for calorie-dense proteins. Nuts, cheese, and fatty meats provide protein but can add many calories.
- Steam or microwave vegetables. Vitamin C is heat-sensitive and water-soluble; boiling can leach some into the cooking water.
If you regularly track single foods, tools like the chicken thigh protein calculator and waffle vitamin C calculator can give you a quick per-item estimate for specific dishes.
Frequently Asked Questions
Why are the Daily Values different for protein and vitamin C?
Protein's Daily Value is based on 50 g per day on a 2,000-calorie diet, while vitamin C's Daily Value is 90 mg. These reference amounts come from FDA labeling rules. Your personal needs may be higher or lower depending on age, sex, activity level, pregnancy, and medical conditions.
Does cooking destroy vitamin C?
Some vitamin C is lost during cooking because it is water-soluble and sensitive to heat. Boiling typically causes the greatest losses, while steaming and microwaving preserve more. The values in this calculator are for common cooked forms where indicated, but raw-is-best for maximum vitamin C.
Can I get too much vitamin C?
The upper limit for adults is generally 2,000 mg per day from food and supplements. It is difficult to exceed that with food alone, but very high doses from supplements can cause digestive discomfort. Protein intake above needs is generally stored or used inefficiently, so spread it across meals.
For more detailed nutrition data, consult the USDA FoodData Central database or speak with a registered dietitian.