By Zencalcy Editorial TeamLast reviewed About us
Glycemic load adjusts glycemic index for the amount of carbohydrate actually eaten. A high-index food in a small portion can have a modest load, while a medium-index food eaten in quantity can have a large one. This calculator returns the load and places it in a low, medium or high band.
Combine glycemic index and carbohydrate amount.
| Use a GI value from a reliable table. | |
GL = GI × available carbohydrate(g) ÷ 100
Available carbohydrate excludes fibre that is not digested. Glycemic load bands commonly used are low at 10 or below, medium from 11 to 19, and high at 20 or above. Individual glucose responses also depend on portion size, food preparation and the rest of the meal.
| Symbol | Meaning |
|---|---|
| GI | Glycemic index of the food on a 0–100 scale. |
| carbohydrate | Grams of available carbohydrate in the portion. |
| GL | Glycemic load, the GI scaled by carbohydrate amount. |
GL = 75 × 30 ÷ 100 = 22.5, which is in the high band. An apple with GI 36 and 20 g of available carbohydrate gives 36 × 20 ÷ 100 = 7.2, a low load. GI 55 with 30 g gives 16.5, a medium load.
Glycemic index is measured against a fixed carbohydrate reference, which makes it easy to forget that people eat different amounts. Watermelon has a relatively high GI, but a usual slice contains little carbohydrate, so its glycemic load is modest. White bread has a similar GI and a much larger load in a typical serving. Multiplying by carbohydrate grams resolves that mismatch. The approach still has limits: cooking, ripeness, food structure and the rest of the meal all change digestion. Fat, protein, fibre and acidity can slow gastric emptying and blunt the peak. Glycemic load is therefore best used to compare portions and combinations, not to label individual foods as allowed or forbidden. For someone monitoring glucose, the meter or sensor response remains the most direct feedback.
Continue with the Blood Sugar Converter, Estimated Average Glucose Calculator, or the A1c Calculator — or browse more diabetes tools and all health calculators.
Glycemic index describes how quickly a fixed amount of carbohydrate raises glucose. Glycemic load multiplies that index by the carbohydrate actually eaten, so it reflects both food quality and portion size.
These tools convert or screen laboratory values using published formulas. They do not diagnose diabetes, insulin resistance or ketoacidosis, and they do not calculate an insulin dose. Laboratory methods vary; confirm results with the reporting lab and a clinician. DKA symptoms need urgent medical care.
Reference material used to build and check this calculator:
Last reviewed: September 2026. See how we build and check every tool on the about page.
Content updated: September 2026