Glycemic Load Calculator — GL by Food & Serving Size
Calculate the glycemic load (GL) of any food by selecting a preset or entering a custom GI. GL accounts for both glycemic index and real serving size — a far better predictor of blood sugar impact than GI alone.
This serving produces a significant blood sugar spike. Frequent high-GL servings increase insulin resistance risk. Reduce serving size, pair with protein and fat, or swap for a lower-GI alternative.
A full day of low-GL eating targets a total daily GL under 100. This single serving accounts for 30.2 of that budget. Use this calculator for each meal component to stay within your daily GL goal.
How to use this calculator
Select a food from the preset dropdown — the GI and carbs per 100g auto-fill. Then adjust the serving size to match your actual portion. The glycemic load, carbohydrate content, and GL classification update instantly. For unlisted foods, choose "Custom / manual" and enter the GI and carbs per 100g from a nutrition label or food database.
Understanding your glycemic load result
Glycemic Load = (GI × grams of carbs in serving) ÷ 100. A GL of 0–10 is Low (minimal blood sugar spike), 11–19 is Medium (moderate spike), and 20+ is High (significant spike). Unlike GI alone, GL reflects what actually happens to your blood sugar when you eat a realistic amount of that food.
Frequently asked questions
Glycemic load classification — Low, Medium, and High
Glycemic load (GL) is classified into three tiers. A single serving's GL, not just its GI, determines its real-world blood sugar impact. Low-GL foods are preferred for blood sugar management and sustained energy.
| GL category | GL range | Example foods | Blood sugar impact |
|---|---|---|---|
| Low | 0–10 | Lentils, most vegetables, berries, apple | Minimal spike — steady energy, preferred for diabetes management |
| Medium | 11–19 | Banana, oatmeal, whole wheat bread, brown rice | Moderate rise — manageable with balanced meal composition |
| High | 20+ | White rice, white bread, cornflakes, baked potato | Rapid spike — increases insulin demand, fat storage risk |
GI vs. GL — why glycemic load is more useful
Glycemic Index (GI) measures how quickly a food raises blood sugar on a standardized 50g carbohydrate portion — which often doesn't match real serving sizes. Glycemic Load (GL) corrects for this by factoring in the actual carbohydrate content of a real serving. The formula: GL = (GI × grams of carbs) / 100.
- ·Watermelon has a high GI (76) but a low GL per serving (~4) because a typical serving contains very few carbs (≈200g slice = ~8g carbs)
- ·White bread has both a high GI (75) and a high GL because each slice genuinely delivers a large carb load
- ·Carrots were once falsely maligned for their GI of 47 — but their real-world GL per serving is just ~3, making them a low-GL food
- ·GL accounts for the actual quantity of carbohydrates consumed, not just carbohydrate quality — portion control matters enormously
- ·A daily total GL under 100 is generally considered low-GL; 100–150 is moderate; over 150 is high-GL
Common foods — GI, serving size, carbs, and GL at a glance
Use this reference table to compare foods side by side. GL per serving is what matters most for day-to-day meal planning.
| Food | GI | Typical serving | Carbs/serving | GL/serving |
|---|---|---|---|---|
| White rice | 72 | 150g (cooked) | 42g | 30 — High |
| Brown rice | 50 | 150g (cooked) | 35g | 18 — Medium |
| White bread | 75 | 30g (1 slice) | 15g | 11 — Medium |
| Whole wheat bread | 69 | 30g (1 slice) | 12g | 8 — Low |
| Oatmeal (cooked) | 55 | 250g (1 bowl) | 30g | 17 — Medium |
| Cornflakes | 81 | 30g | 25g | 20 — High |
| Pasta (cooked) | 49 | 180g | 45g | 22 — High |
| Potato (baked) | 78 | 150g | 32g | 25 — High |
| Sweet potato | 63 | 150g | 30g | 19 — Medium |
| Banana | 51 | 120g (1 med) | 28g | 14 — Medium |
| Apple | 36 | 120g (1 med) | 17g | 6 — Low |
| Watermelon | 76 | 200g slice | 12g | 9 — Low |
| Lentils | 32 | 150g (cooked) | 30g | 10 — Low |
| Chickpeas | 28 | 150g (cooked) | 40g | 11 — Medium |
| Chocolate (dark) | 40 | 30g | 14g | 6 — Low |
| Orange juice | 50 | 240ml (1 cup) | 24g | 12 — Medium |
| Cola | 63 | 355ml (12oz) | 39g | 25 — High |
| Carrot | 47 | 80g | 8g | 4 — Low |
Tips for lowering the glycemic load of your meals
You don't have to eliminate high-GI foods entirely — strategic pairing and preparation changes can meaningfully reduce the glycemic impact of any meal.
- ·Pair carbs with protein and fat — both slow gastric emptying and blunt the blood sugar spike (e.g., add olive oil to pasta, eat bread with nut butter)
- ·Add vinegar or lemon juice — acetic acid reduces the glycemic response of a meal by up to 20–30%; use in dressings, marinades, or as a side dip
- ·Choose al dente over soft — more cooking time gelatinizes starch and raises GI; slightly undercooked pasta and firmer grains have lower GIs
- ·Cool then reheat carbs — cooling cooked rice, potatoes, and pasta forms resistant starch, cutting the GL by 15–25% (this starch survives reheating)
- ·Eat carbs last in the meal — consuming vegetables and protein first significantly reduces the glucose peak of the carbohydrate course
- ·Opt for whole over refined — fiber slows digestion, reducing both GI and GL; choose intact grains, legumes, and whole fruit over juice
- ·Watch liquid calories — sugary drinks and juice lack fiber, causing rapid glucose spikes with a high GL despite a small volume
Who should track glycemic load
GL tracking is most valuable for people with specific metabolic or weight management goals. It is not necessary for everyone, but it is a powerful tool for certain populations.
- ·Type 2 diabetes — low-GL diets consistently improve HbA1c, reduce postprandial spikes, and decrease insulin requirements vs. low-fat diets
- ·Prediabetes — GL-aware eating can delay or prevent progression to full type 2 diabetes; current evidence supports GL reduction as a first-line lifestyle intervention
- ·PCOS (polycystic ovary syndrome) — insulin resistance is central to PCOS; low-GL diets reduce fasting insulin, improve cycle regularity, and support weight loss in affected women
- ·Weight loss — foods with a low GL tend to produce greater satiety and less fat storage than calorie-matched high-GL foods, even at the same calorie intake
- ·Sustained energy goals — athletes, executives, and shift workers who need stable mental and physical energy benefit from minimizing large GL swings throughout the day