Leek Glycemic Load Calculator

Leeks are one of the gentlest allium vegetables on blood sugar, but gentle never means zero. This Leek Glycemic Load Calculator estimates how a serving of leeks affects blood glucose by combining the food's glycemic index (GI) with the actual net carbohydrates in your portion. GI tells you how quickly carbs enter the bloodstream, while glycemic load (GL) reflects how many carbs you are really eating, making it the more useful number for portion-based meal planning.

Enter your serving in grams, cups, or ounces; use the typical leek GI of 15 or override it; and optionally adjust the net-carb value. The calculator returns your estimated GL, a step-by-step breakdown, and a low/medium/high category label.

Whether you are managing diabetes, following a low-glycemic diet, or just curious how your favorite soup base fits into your daily carb budget, this tool gives you a quick, evidence-based answer in seconds.

🥬 Serving Size

⚙️ Glycemic Index

GI value (glucose = 100)

Net Carbs Override (optional)

g per 100 g — blank uses 12.35 g

Enter a serving amount and press Calculate.

Step-by-Step Guide

Start by entering how much leek you plan to eat — in grams, cups of chopped leek, or ounces. If you are working from a whole leek, remember that only the white and light-green portion is usually eaten; the dark green tops are tough and typically go into the compost bin, so weigh the trimmed edible part.

The glycemic index field is pre-filled at 15, the value most commonly cited for leeks. You can keep it or override it with a value from another database. The net-carb field is optional: leave it blank and the calculator uses 12.35 g of net carbs per 100 g of raw leek (USDA-derived). Press Calculate, and you get the estimated glycemic load, a full breakdown, and a low/medium/high category label.

Portion tip: 1 cup of chopped raw leek weighs about 89 g, and a medium whole leek trimmed to the edible white/light-green part is also roughly 89–100 g. Use the preset buttons above to jump straight to these common portions.

The Math Behind Glycemic Load

Glycemic load refines the glycemic index by scaling it to the actual amount of carbohydrate in your portion:

GL = (GI × available carbohydrate in grams) ÷ 100

Available carbohydrate, often called net carbs, is total carbohydrate minus fiber, because fiber is not digested into glucose. For raw leeks, 100 g contains about 14.15 g of total carbohydrate and 1.8 g of fiber, so available carbohydrate is roughly 12.35 g.

Interpretation scale: GL ≤ 10 is low, 11–19 is medium, and ≥ 20 is high. Most realistic leek portions land well below 10, which is why leeks are considered a low-glycemic vegetable even in generous servings.

Reference Data: Leeks at a Glance

Measure	Weight	Total carbs	Fiber	Net carbs	Typical GL
100 g raw leek	100 g	14.15 g	1.8 g	12.35 g	≈ 1.9
1 cup chopped	89 g	12.6 g	1.6 g	11.0 g	≈ 1.7
1 medium leek (edible part)	~89 g	~12.6 g	~1.6 g	~11.0 g	≈ 1.7

Values reference raw leek data from the USDA FoodData Central database and a commonly cited GI of 15 (glucose reference) from the University of Sydney's glycemic index database. Variety, growing conditions, and cooking method can shift the numbers slightly.

Worked Examples

Example 1 — Small side portion (100 g): Net carbs = 12.35 g. GL = (15 × 12.35) ÷ 100 ≈ 1.9. Category: low.

Example 2 — Hearty leek soup base (200 g): Net carbs = 24.7 g. GL = (15 × 24.7) ÷ 100 ≈ 3.7. Still low — leeks contribute modestly to blood sugar even in generous amounts.

Example 3 — What if the GI were higher? (200 g leek, GI 30): GL = (30 × 24.7) ÷ 100 ≈ 7.4. Even with a doubled GI, the load stays in the low range because the carb density of leeks per serving is low.

Common Mistakes to Avoid

Weighing the whole leek: Count only the trimmed edible portion; the dark green tops add weight that never reaches the plate.
Confusing GI with GL: GI is a property of the food; GL depends on your portion. A low-GI food eaten in huge volume can still produce a meaningful glucose response.
Ignoring added ingredients: This calculator covers leeks alone. If you are making a dish with potatoes, cream, breadcrumbs, or cornstarch, those carbohydrates must be counted separately.

Health note: This tool provides dietary estimates for educational use only and is not medical advice. Anyone managing diabetes or insulin resistance should discuss meal planning with a doctor or registered dietitian.

Frequently Asked Questions

Is 15 the exact GI of leeks? Published values for leeks cluster in the low range, but GI varies with variety, growing conditions, and cooking. The University of Sydney's glycemic index database (glycemicindex.com) rates leeks as low; exact numbers can differ between sources, which is why the calculator lets you override the GI field.

Are leeks suitable for low-carb or keto diets? With roughly 12.35 g of net carbs per 100 g, leeks are similar to onions. Small portions (50–100 g) fit easily into low-carb plans, though leeks are not as carb-light as leafy greens like spinach or lettuce.

Does cooking change leek GL? Cooking softens cell walls and can slightly raise the glycemic response, while boiling leaches some sugars into the cooking water. For most practical purposes, raw and gently cooked leeks are close enough that the same GL estimate applies.

How do leeks compare with other vegetables? Most non-starchy vegetables have a very low GL per serving. If you want to compare blood-sugar impact across your vegetable rotation, try the beet glycemic load calculator or the pumpkin glycemic load calculator.

Where does the nutrient data come from? Carbohydrate and fiber values reference the USDA FoodData Central database (fdc.nal.usda.gov), the standard source behind U.S. nutrition labels.