Watercress is one of the most nutrient-dense leafy greens you can add to your diet, yet it's remarkably low in calories. This calculator helps you determine exactly how many calories are in any amount of watercress, whether you're tracking a specific recipe, meal-prepping salads, or simply curious about the energy content of this peppery green.
Simply enter the weight of watercress in ounces (or grams) and choose your preferred unit, and the tool will instantly compute the calories, along with a breakdown of carbohydrates, protein, and fat. You can also use the quick-fill buttons to see common serving sizes like a standard 1-ounce portion or a typical 2-cup salad serving. Perfect for calorie counters, dietitians, and anyone following a low-calorie or nutrient-dense eating plan.
🥬 Watercress Calorie Calculator
How to Use This Tool
Using the watercress calorie calculator is straightforward. Enter the amount of watercress you have in the input field, select the unit (ounces, grams, or cups of chopped leaves), and click Calculate. The tool instantly shows the total calories along with a macronutrient breakdown (carbs, protein, and fat) based on the weight you entered.
You can also use the quick-fill buttons to instantly load common serving sizes: 1 ounce, 2 cups (a typical salad portion), or 100 grams. This is handy when you're following a recipe that lists watercress in cups but you want to know the calorie impact, or when you're logging your meal in a food diary that uses grams.
The calculator is designed for anyone tracking calories or macros — whether you're on a weight-loss plan, building muscle, or just curious about the nutritional profile of this leafy green. It's also useful for meal preppers who want to batch-calculate the calorie content of salads or soups.
How It Works
The calorie and macronutrient values are derived from the USDA FoodData Central database for raw watercress. Per 100 grams, raw watercress contains approximately:
- Calories: 11 kcal
- Carbohydrates: 1.29 g
- Protein: 2.3 g
- Fat: 0.1 g
The calculator converts your input to grams using standard conversions: 1 ounce = 28.3495 grams, and 1 cup of chopped watercress ≈ 34 grams (this is an average density; actual weight can vary slightly depending on how tightly it's packed). Then it scales the per-100g values proportionally.
For example, if you enter 2 ounces, the tool converts to 56.7 grams, then calculates calories as (56.7 / 100) × 11 = 6.2 kcal. The same proportional scaling applies to carbs, protein, and fat.
Worked Examples
Example 1: Salad serving
You're making a salad with 2 cups of chopped watercress. Using the quick-fill button, the calculator converts 2 cups to 68 grams. Calories = (68/100) × 11 = 7.5 kcal. Carbs = 0.88 g, protein = 1.56 g, fat = 0.07 g.
Example 2: Recipe ingredient
A soup recipe calls for 150 grams of watercress. Enter 150 in grams. Calories = (150/100) × 11 = 16.5 kcal. Carbs = 1.94 g, protein = 3.45 g, fat = 0.15 g.
Example 3: Snack portion
You grab a handful of watercress as a snack, roughly 1 ounce. Calories = (28.35/100) × 11 = 3.1 kcal. That's almost negligible, making watercress an excellent low-calorie snack base.
Tips & Best Practices
- Use a kitchen scale for the most accurate results, especially if you're tracking macros precisely. Volume measurements like cups can vary by 10-20% depending on how tightly the leaves are packed.
- Remember that watercress is mostly water — about 95% — which is why it's so low in calories. This also means it's very hydrating and adds bulk to meals without adding significant energy.
- Pair watercress with a source of fat (like olive oil or nuts) to help absorb fat-soluble vitamins A and K, which are abundant in this green.
- When logging in an app, choose the entry for "watercress, raw" to match the values used here. Cooked watercress has slightly different values due to water loss.
Factors Affecting Accuracy
The calorie content of watercress can vary slightly depending on growing conditions, variety, and freshness. The USDA values are averages from multiple samples. The main source of error in your calculation is the volume-to-weight conversion for cups. Chopped leaves settle differently than whole leaves, and a loosely packed cup will weigh less than a tightly packed one. For the most accurate results, always weigh your watercress in grams or ounces rather than relying on cup measurements.
Also note that if you're adding dressings, oils, or other ingredients, those calories are not included in this calculator. Watercress itself is nearly calorie-free, but the toppings can add hundreds of calories.
Frequently Asked Questions
Is watercress really that low in calories?
Yes. Watercress is one of the lowest-calorie vegetables, with only about 11 calories per 100 grams. A full 2-cup salad portion has fewer than 10 calories.
Can I use this calculator for cooked watercress?
Cooked watercress loses water and becomes more concentrated, so the calorie density per gram increases slightly. However, the difference is small. For cooked watercress, you might estimate about 20 calories per 100 grams. This calculator is best for raw watercress.
How does watercress compare to other leafy greens?
Watercress is similar to spinach and arugula in calorie content, but it's exceptionally high in vitamin K, vitamin C, and antioxidants. It's often ranked as one of the most nutrient-dense foods per calorie.
Why does the calculator show grams in the result?
Showing the converted weight helps you verify the calculation and understand the basis for the calorie estimate. It's also useful if you're cross-checking with a nutrition label or app.
Additional Resources
For more detailed nutritional data, you can consult the USDA FoodData Central database, which provides comprehensive nutrient profiles for thousands of foods. The NIH Office of Dietary Supplements also offers fact sheets on vitamins and minerals found in leafy greens.
If you're tracking calories for weight management, you might also find our protein needs calculator useful for planning your daily intake.