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Glycemic Load (GL) combines a food's glycemic index (GI) with the actual amount of carbohydrate in a serving, giving a more complete picture than GI alone of a food's likely effect on blood sugar. GL = (GI x carbohydrate grams per serving) / 100. This calculator is for general reference and educational purposes only, not medical or dietary advice — consult a doctor or registered dietitian for an actual meal plan.
How it works
Enter the glycemic index of the food (a food-specific value you look up separately — no food database is built into this tool) and the grams of carbohydrate in the serving. The tool applies the GL formula and classifies the result as low, medium, or high.
- Enter glycemic Index (0-110).
- Enter carbohydrate per serving (g).
- Click Calculate to see your results.
Examples
A food with GI 65 and 30g carbs per serving
GL = (65 x 30) / 100 = 19.5 — medium glycemic load.
Who should use it
- Comparing the likely blood sugar impact of different carbohydrate foods or portions.
- General nutrition education about carbohydrate quality versus quantity.
Industry applications
- Nutrition and dietetics education
- Diabetes and weight-management meal planning support
Advantages
- Accounts for both the quality (GI) and quantity (carb grams) of carbohydrate in a serving.
- Simple, transparent formula.
Limitations
- Depends entirely on an accurate, separately-sourced glycemic index value.
- Does not account for meal composition (fat, protein, fiber) which also affects blood sugar response.
Common mistakes to avoid
- Using the glycemic index of a similar-sounding food instead of the exact food and preparation method.
- Forgetting that GL depends on serving size — the same food has a different GL at a different portion.
Best practices
- Look up GI values from a single consistent, published source for comparable results across foods.
Tips
- Consider glycemic load alongside overall diet quality, not as a standalone rule for food choices.