Choy — bok choy, choy sum, napa cabbage and other Asian leafy greens — is prized for its crisp texture and mild flavor, but how much natural sugar does a serving actually contain? This Choy Sugar Calculator gives you a quick, evidence-based estimate based on commonly cited nutrition data, so you can track natural sugars alongside your other macros.
Simply choose your choy type, enter a portion in grams, ounces, cups or handfuls, and hit Calculate. The tool breaks down total sugar, sugar per 100 g, calories from sugar, and how that compares to a 50 g daily sugar budget. It is handy for meal planners, people watching sugar, anyone monitoring carbohydrate intake, and curious home cooks who want to know whether their stir-fry contributes meaningful sugar.
Choy is naturally very low in sugar, but portions add up. Use this calculator to see exactly what your bowl contains.
🥬 Enter Your Choy Serving
How to Use This Tool
This calculator is built for anyone who tracks sugar intake without overthinking nutrition labels. Start by selecting the choy type that matches what you have in the kitchen. The dropdown already lists the typical sugar value per 100 g for raw bok choy, boiled bok choy, choy sum, and napa cabbage, so you do not need to look anything up.
Next, enter the portion you actually plan to eat. The amount field works with grams and ounces for weighed portions, and with chopped cups and handfuls for quick estimates. A rough guide is embedded in the unit dropdown: one cup of chopped raw choy weighs about 70 g, and one handful weighs about 30 g. If your recipe lists a weight, grams will always give the most accurate result. The Quick add buttons let you jump to common portions. After clicking Calculate, the result panel shows total sugar, sugar per 100 g, calories from sugar, and the share of a 50 g daily sugar budget.
Reference Sugar Values
The values used in the calculator are based on standard nutrient databases, including USDA FoodData Central, and are rounded to two decimal places. Actual numbers vary by variety, growing conditions, and maturity, but these are a reliable starting point:
| Choy type | Sugar per 100 g | Notes |
|---|---|---|
| Bok choy, raw | 1.18 g | Most common stir-fry green; mild and crisp. |
| Bok choy, boiled (drained) | 0.81 g | Some sugar leaches into cooking water. |
| Choy sum, raw | 0.70 g | Also called flowering cabbage; slightly earthier. |
| Napa cabbage, raw | 1.20 g | Paler, juicier leaves; common in kimchi and hot pots. |
For precise values for a specific product, check the package label or search the official USDA FoodData Central database.
How the Calculation Works
The math is deliberately simple. Sugar content is expressed per 100 grams of edible portion, so the formula is:
Sugar (g) = portion weight (g) × sugar per 100 g ÷ 100
For ounce entries, the calculator first converts ounces to grams using 1 oz = 28.3495 g. For cups, it uses a chopped raw conversion of about 70 g per cup; for handfuls, 30 g per handful. It then estimates calories from sugar using the standard 4 kcal per gram of carbohydrate, and compares the sugar result to a 50 g daily sugar budget, which is a common reference target for added sugars and total sugar monitoring.
This calculator does not estimate total carbohydrates, fiber, or glycemic impact. Sugar is just one fraction of the total carb picture in choy.
Worked Examples
Example 1: You make a 1-cup serving of raw bok choy. One cup is about 70 g, and raw bok choy has 1.18 g sugar per 100 g. Sugar = 70 × 1.18 ÷ 100 = 0.83 g. Calories from sugar = 0.83 × 4 = 3.3 kcal. That is about 1.7% of the 50 g sugar budget.
Example 2: You stir-fry 250 g of choy sum for a main-dish salad. Sugar = 250 × 0.70 ÷ 100 = 1.75 g. Calories from sugar = 7.0 kcal, and the share of a 50 g budget is 3.5%. Even a large plate of choy contributes very little sugar.
Limitations & Accuracy Notes
Natural foods vary. A bok choy plant harvested in one season can differ from another by a few tenths of a gram of sugar per 100 g. The values here are typical averages, not laboratory results for your exact bunch. Cooking method also matters: boiling can lower sugar because some sugars dissolve into the water, while stir-frying with sauces can add sugar from seasonings. If you are tracking a dish with soy sauce, honey, oyster sauce, or sugar, include those ingredients separately.
Frequently Asked Questions
Is choy good for low-sugar diets? Yes. Even a generous 200 g portion of raw bok choy supplies only about 2.4 g of natural sugar, and most of the carbohydrate in leafy greens comes from fiber and water rather than sugar. If you are watching carbs, the total carb value is still low, but check a full nutrition entry for net carbs.
Does cooking increase or decrease sugar? Cooking does not create sugar, but it changes weight. Boiled choy often shows a slightly lower sugar value per 100 g because water-soluble sugars can leach into the cooking liquid. Dry cooking methods such as stir-frying remove water, so the same food may have a slightly higher sugar concentration per 100 g after cooking.
Why does my package label show a different number? Labels can use different databases, serving-size conventions, or growing-region data. This calculator is a practical estimate, not a substitute for the label on the product you bought.
What about baby bok choy or other Asian greens? Baby bok choy is very close to mature bok choy in sugar content; choose the raw bok choy option. If you are tracking fat as well, the Choy Fat per 100g Calculator covers that side of the nutrition profile. For a leafy green comparison, the avocado sugar per 100g calculator shows how a higher-sugar plant food stacks up.