Glycemic Index Calculator
Look up the glycemic index and glycemic load of 30+ common foods. Calculate GL for any serving size to support blood sugar management and diabetes control.
About this tool
Search a database of 30+ common foods to find their glycemic index (GI) and calculate glycemic load (GL) for any serving size. Includes low-GI food recommendations, health tips based on classification, and a custom food input for any food not in the database.
How to use it
Quick steps to get the most out of this utility.
- 1
Search or browse the food database
Use the search bar or filter by category (fruits, vegetables, grains, etc.) to find a food from our database of 30+ items.
- 2
Select a food and adjust serving size
Click a food card to select it. Use the serving size slider to adjust the portion — GL is calculated instantly based on your chosen multiplier.
- 3
Read your results and health tip
See the GI value, classification badge (low/medium/high), carb content, and personalized health guidance based on your selected food.
Understanding Glycemic Index & Glycemic Load
The Glycemic Index (GI) ranks foods on a scale from 0 to 100 based on how quickly they raise blood glucose levels after eating. Foods are classified as low GI (55 or less), medium GI (56–69), or high GI (70+). The reference food is glucose (GI = 100). However, GI alone doesn't account for how much carbohydrate is in a realistic serving — that's where Glycemic Load (GL) comes in.
Glycemic Load multiplies the GI by the actual carb content per serving and divides by 100: GL = (GI × carbs per serving) ÷ 100. This gives you the real-world blood sugar impact of eating a specific amount of a food. A GL under 10 is considered low, 11–19 is medium, and 20+ is high. Research suggests that choosing low-GL foods consistently can improve blood sugar control, support weight management, and reduce the risk of type 2 diabetes and heart disease.
Frequently asked questions
What is the Glycemic Index (GI)?+
The Glycemic Index is a ranking of carbohydrates in foods from 0 to 100 based on how quickly and how high they raise blood sugar levels after eating. Foods with a low GI (55 or less) are digested and absorbed slowly, causing a gradual rise in blood sugar. High-GI foods (70+) are digested quickly, causing a rapid spike.
What is Glycemic Load (GL)?+
Glycemic Load accounts for both the quality (GI) and quantity (carbs) of carbohydrates in a serving of food. It's calculated as GL = (GI × carbs per serving) / 100. GL gives a more practical measure of how a food will affect your blood sugar in real-world portion sizes. A GL under 10 is low, 11–19 is medium, and 20+ is high.
What's the difference between GI and GL?+
GI tells you how fast a carbohydrate food raises your blood sugar (the speed), while GL tells you how much it will raise it (the impact per serving). A watermelon has a high GI (76) but a low GL (~5) per slice because it's mostly water and fiber. This is why GL is often more useful for meal planning.
Why do some foods like eggs and fish have GI = 0?+
Foods that contain essentially no carbohydrates (like eggs, fish, and meat) are assigned GI = 0. They have minimal direct impact on blood sugar levels. However, they can still influence insulin response and satiety through protein and fat content.
Is this tool a substitute for medical nutrition therapy?+
No. This calculator provides estimated GI and GL values from published databases for informational purposes. Individual responses to foods can vary based on many factors including ripeness, cooking method, meal composition, gut microbiota, and metabolic health. Always consult a qualified healthcare provider or registered dietitian for personalized dietary advice.
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