Enter a food's Glycemic Index (GI), carbohydrates per portion (g), and portion size (g) to calculate its Glycemic Load (GL) — a more precise measure of how much that food will raise your blood sugar. Your results include the GL value, a classification (low, medium, or high), and a visual breakdown to guide smarter food choices.
Glycemic Load (GL)
--
GL Category
--
GI Category
--
Carbs per 100 g
--
Glycemic Load measures both how quickly a food raises blood sugar (its GI) and how much carbohydrate it actually delivers in a real portion. Unlike GI alone, GL accounts for serving size, making it a more practical guide for managing blood sugar. A food can have a high GI but a low GL if you eat a small portion of it.
The formula is: GL = (GI × Carbohydrates per portion) ÷ 100. For example, if a food has a GI of 50 and contains 30 g of carbs per portion, its GL = (50 × 30) ÷ 100 = 15. This calculator automatically applies that formula based on your inputs.
The Glycemic Index (GI) ranks how rapidly a food's carbohydrates raise blood glucose on a scale of 0–100, based on a standard 50 g carbohydrate portion. Glycemic Load (GL) refines this by factoring in the actual amount of carbohydrates in a realistic serving, giving you a truer picture of a meal's blood sugar impact.
A GL of 10 or below is considered low, 11–19 is medium, and 20 or above is high. For context, health authorities recommend keeping your total daily GL under 100 for good blood sugar management, and ideally around 80 or lower.
Yes. Watermelon is a classic example — it has a high GI of around 72 but delivers very few carbohydrates per typical serving, giving it a low GL of about 4–5. This is why using GL alongside GI gives you a more accurate picture of a food's real blood sugar impact.
The carbohydrate content is listed on any standard nutrition label. GI values can be found in databases such as the University of Sydney's official GI database (glycemicindex.com). Keep in mind that GI can vary depending on food ripeness, cooking method, and processing.
GL is especially useful for people managing type 2 diabetes, prediabetes, insulin resistance, or PCOS, as well as anyone trying to maintain steady energy levels or control weight. It can also benefit athletes planning pre- and post-workout nutrition. Always consult a healthcare professional for personalised dietary advice.
Absolutely. Because GL is directly proportional to the carbohydrates eaten, doubling your portion size doubles the GL. This is why portion control is one of the most effective tools for keeping GL low, even when eating moderate-GI foods.