Bok choy, also known as Chinese cabbage, is a low-calorie leafy green packed with vitamins A, C, and K, as well as calcium and iron. Whether you're tracking your daily intake, meal prepping, or following a specific diet plan, knowing the exact calorie count per tablespoon can help you stay on target.
This calculator lets you enter the weight of bok choy (raw or cooked) and instantly converts it to calories per tablespoon. It supports both metric (grams) and imperial (ounces) units, and accounts for the typical water loss during cooking. Perfect for nutritionists, dietitians, fitness enthusiasts, and anyone who wants precise calorie data for their meals.
🥬 Choy Calories Per Tablespoon
📊 Results will appear here.
How to Use This Tool
Enter the weight of your bok choy (raw or cooked) in grams or ounces. Select whether the choy is raw or cooked — cooking reduces water content, concentrating calories slightly. Click "Calculate" to see total calories and calories per tablespoon. Use the reset button to clear and start over.
Formula Explained
The calculation uses standard USDA nutrition data: raw bok choy contains approximately 13 kcal per 100g, while cooked (boiled) bok choy contains about 20 kcal per 100g due to water loss and concentration of solids. One tablespoon of raw chopped bok choy weighs roughly 15g; cooked bok choy is denser at about 17g per tablespoon. The formula is:
Total Calories = (Weight in grams / 100) × Calories per 100g
Calories per Tablespoon = (Calories per 100g / 100) × Grams per tablespoon
Worked Examples
Example 2: 200g cooked bok choy. Total calories = (200/100) × 20 = 40 kcal. Calories per tbsp = (20/100) × 17 = 3.4 kcal/tbsp.
Let's walk through a more detailed example. Suppose you have 85 grams of raw bok choy (about 3 ounces). First, the weight is already in grams, so no conversion is needed. Total calories = (85 / 100) × 13 = 11.05 kcal. Calories per tablespoon = (13 / 100) × 15 = 1.95 kcal/tbsp. So if you eat 3 tablespoons of this raw bok choy, you'd consume about 5.85 kcal. For cooked bok choy, say you have 120 grams of boiled bok choy. Total calories = (120 / 100) × 20 = 24 kcal. Calories per tablespoon = (20 / 100) × 17 = 3.4 kcal/tbsp. Three tablespoons would give you about 10.2 kcal. These examples show how the calculator handles different weights and states.
Common Mistakes to Avoid
- Using raw density for cooked choy: Cooked choy is denser — using 15g/tbsp instead of 17g will underestimate calories per tablespoon by about 13%.
- Forgetting unit conversion: If you enter ounces but leave the unit on grams, the result will be off by a factor of ~28.3. Always double-check the unit selector.
- Ignoring added fats: Stir-frying with oil adds significant calories — this calculator is for plain choy only. If you add oil, you'll need to account for those extra calories separately.
- Assuming all cooking methods are equal: Steaming causes less water loss than boiling, so the calorie density will be slightly lower. For steamed choy, the raw setting is a closer approximation.
Real-World Applications
This tool is useful for dietitians planning low-calorie meal plans, fitness enthusiasts tracking macros, and anyone following a calorie-controlled diet. Bok choy is a staple in many Asian cuisines and is often used in soups, stir-fries, and salads. Knowing its calorie density helps you incorporate it without guesswork. For example, if you're making a stir-fry with 200g of raw bok choy, you'll know it contributes only about 26 kcal, leaving plenty of room for other ingredients. In a soup, where bok choy is often added in larger quantities, this calculator helps you keep the total meal within your calorie target.
Frequently Asked Questions
Q: Does the calorie count change if I steam instead of boil?
A: Steaming causes less water loss than boiling, so the calorie density will be slightly lower. Use the "raw" setting as a close approximation for steamed choy.
Q: Is baby bok choy different?
A: Baby bok choy has a similar calorie density but may have slightly more water. The difference is negligible for most purposes — less than 1 kcal per tablespoon.
Q: Can I use this for other leafy greens?
A: No — each green has a different calorie density. For similar tools, see our Choy Carbs Calculator or Choy Glycemic Load Calculator.
Q: Where does the data come from?
A: Values are based on the USDA FoodData Central database, a reliable source for nutrition information. You can access the full dataset at fdc.nal.usda.gov.
Q: How accurate are the tablespoon measurements?
A: The weight of a tablespoon of chopped bok choy can vary depending on how finely it's chopped and how tightly it's packed. Our values (15g for raw, 17g for cooked) are averages based on standard chopping and light packing. For the most accurate results, weigh your portion rather than relying on volume.