Glycemic Load Calculator

Glycemic load (GL) measures how much a specific serving of food is likely to raise blood sugar, by combining a food's glycemic index (GI) with how much carbohydrate it actually contains. It answers a more useful question than GI alone: not just how fast a food's carbs convert to blood sugar, but how much of an effect a real serving actually has.

What Glycemic Load Measures

GI alone only measures the quality of a food's carbohydrate, how quickly it raises blood sugar compared to pure glucose. GL multiplies that by quantity, the actual grams of carbohydrate in a serving, so a food with a high GI but very little carbohydrate per serving (like watermelon) can still have a modest glycemic load.

The Formula

Glycemic load is calculated directly from a food's GI value and its carbohydrate content per serving¹.

Glycemic Load = (Glycemic Index x grams of carbohydrate per serving) / 100

The concept was introduced to capture what GI alone misses, the practical, real-serving-size effect of a food on blood sugar¹.

How This Calculator Computes Your Result

Enter the carbohydrate grams for your serving and the food's glycemic index value (use the built-in reference list for common foods, or enter a known GI value manually). The calculator multiplies the two and divides by 100 to return your glycemic load, along with its category.

What Your Result Means

Glycemic load is grouped into three standard categories²:

• Low glycemic load: 10 or under

• Medium glycemic load: 11 to 19

• High glycemic load: 20 or over

A lower glycemic load generally means a smaller, slower rise in blood sugar after eating that food. Public health guidance also recommends looking at glycemic load across a whole meal, not just single foods in isolation, since meals combine multiple carbohydrate sources with protein and fat, all of which affect the overall blood sugar response³.

Why Glycemic Load Is More Useful Than Glycemic Index Alone

GI is measured using a fixed 50g carbohydrate reference amount, regardless of how much of that food a person would realistically eat in one sitting. Glycemic load corrects for this by using the actual carbohydrate content of a typical serving, which is why foods like carrots or watermelon can carry a high GI but a low real-world glycemic load, there simply isn't enough carbohydrate in a normal serving to have a large effect¹. This is the main reason nutrition guidance has increasingly shifted toward glycemic load as the more clinically meaningful of the two numbers.