Collard greens are one of the most nutrient-dense leafy vegetables you can add to a low-glycemic diet. This Collard Glycemic Load Calculator estimates the glycemic load (GL) of a serving of collard greens based on how much you eat, the carbohydrate and fiber content, and the glycemic index (GI) you assign. Because collards are naturally very low in digestible carbohydrate, their GL usually stays well below 1 — even with a generous bowl of cooked greens.
The calculator is built for meal planners, type 2 diabetes patients, keto and low-carb dieters, nutrition students, and anyone who tracks daily carbohydrate load. It lets you switch between raw and cooked serving sizes, edit the nutrition values per 100 g, and compare what-if scenarios by changing the GI. The result includes a healthy GL category and a step-by-step breakdown of net carbs and GL, so you can see exactly where the number comes from. Use it to compare collards with other greens, plan plates for diabetes management, or simply become more precise about vegetable portions.
🍃 Collard Glycemic Load Calculator
Estimate the glycemic load of collard greens from your serving size, carbohydrate, fiber, and glycemic index.
How the Glycemic Load Is Calculated
Glycemic load (GL) is a practical measure that combines both the speed of carbohydrate digestion (the glycemic index, or GI) and the amount of carbohydrate in a real serving. The standard formula is:
Net carbohydrates are used in this calculator because dietary fiber is not digestible and does not raise blood glucose in the same way as starch or sugars. Net carbs are simply total carbohydrate minus fiber. For collards, fiber makes up a very large share of the carbohydrate count, which is why the final GL is so low. One cup of cooked collard greens provides only about 4 to 6 g of total carbohydrate and 3 to 4 g of fiber, leaving just 1 to 2 g of available carbohydrate — often less.
The GI of collard greens has not been measured in large clinical databases, but leafy greens are consistently reported as very low-glycemic foods. Most published estimates place the GI of collards in the range of 10 to 15 on the 0–100 glucose scale. This calculator lets you choose any GI from 0 to 100, so you can be conservative (20) or model a higher value (45) as a what-if scenario.
Step-by-Step Example: A Bowl of Cooked Collards
Suppose you plan to eat 1 cup of cooked collard greens, which is about 190 g. Using the default values:
- Total carbohydrate: 2.7 g per 100 g
- Fiber: 2.8 g per 100 g
- GI: 15
First, find the carbohydrate and fiber in 190 g:
Fiber = 2.8 × 190 ÷ 100 = 5.32 g
Net carbs = max(0, 5.13 − 5.32) = 0 g (practically zero)
GL = (15 × 0) ÷ 100 = 0
Even if the measured fiber value were lower, say 2.0 g per 100 g, the GL would still be tiny: net carbs would be (2.7 − 2.0) × 1.9 = 1.33 g, and GL = 15 × 1.33 ÷ 100 = 0.20. That is firmly in the low category (≤ 10).
Reference: Typical Nutrition Values for Collard Greens
Values are approximate and vary by variety, cooking method, and water content. Use your package label or USDA FoodData Central for more precise numbers.
| Form | Total carbs (g/100 g) | Fiber (g/100 g) | Net carbs (g/100 g) | Typical serving |
|---|---|---|---|---|
| Raw collards | 5.6 | 4.0 | 1.6 | 1 cup chopped = 36 g |
| Boiled / cooked from raw | 2.7 | 2.8 | 0 | 1 cup cooked = 190 g |
| Frozen, boiled | 3.7 | 3.4 | 0.3 | 1 cup cooked = 170 g |
| Raw, chopped (salad) | 5.6 | 4.0 | 1.6 | 2 cups = 72 g |
If you are tracking for a low-carb or keto plan, the lesson is that collards are almost a free vegetable in terms of glucose impact. The USDA FoodData Central database provides per-100 g values that you can enter directly into this calculator.
Common Mistakes to Avoid
Also avoid double-counting the effects of cooking oil or sugar. If you sauté collards with honey, bacon, or sweet barbecue sauce, those added carbohydrates must be added separately. This tool measures the collards only, not your entire meal.
Frequently Asked Questions
Is collard greens keto-friendly? Yes. The net carbohydrate content is typically below 2 g per cup, and the GL is effectively zero, so collards fit easily into ketogenic and low-carb eating patterns. For another low-carb leafy comparison, see the Brussels sprouts net carbs calculator.
Why does fiber sometimes appear higher than total carbs? Different databases may define total carbohydrates differently. Some older entries report carbohydrate by difference and may exclude certain fiber components. The calculator therefore floors net carbs at zero and is not sensitive to small database inconsistencies.
Should I count collard greens toward my daily carbs? For most people, the amount of available carbohydrate is so small that exact counting is unnecessary. However, if you eat very large portions, such as 500 g or more, the net carbs can add up to about 8 g, and the GL may climb to around 1.2 — still low, but worth noting if you are on a strict under-20-g keto protocol. The radish glycemic load calculator shows how the same formula applies to another low-GL vegetable.
Can this calculator be used for other leafy greens? Yes, if you enter the correct per-100 g carbs, fiber, and a reasonable GI, the GL formula works for kale, spinach, chard, and any vegetable. Just change the nutrition values and keep the serving size in grams.
Where can I find accurate collard nutrition data? The USDA FoodData Central (fdc.nal.usda.gov) is the standard reference. The American Diabetes Association (diabetes.org) also offers general guidance on non-starchy vegetables. GI values for many foods are listed in the international GI database hosted by the University of Sydney (glycemicindex.com).
Tips for Blood Sugar-Friendly Meals
Collards have a negligible effect on blood glucose on their own, but the foods you serve with them matter. Pair collards with a moderate portion of complex carbohydrate such as lentils or quinoa and a source of protein, and the combined meal GL stays manageable. The fiber in collards also slows gastric emptying and can blunt the glucose response of foods eaten alongside them. To keep collards low-glycemic, cook them by steaming, boiling, or sautéing in olive oil and garlic, and avoid sugar-laden glazes. If you are planning a larger meal, use this calculator first for the collard component, then estimate the GL of the other dishes separately.