Nutrition
Glycemic Load Calculator
Glycemic index alone misleads, watermelon is 'high GI' but harmless per serving. Glycemic load fixes the math.
Glycemic load (GL) shows a food’s real blood-sugar impact: glycemic index × grams of carbohydrate ÷ 100. GL under 10 is low, 11–19 medium, 20 or above high. A watermelon has high GI but low GL. Pair the target with whole foods and adjust based on your own progress and energy levels.
GL = GI × carbs ÷ 100.
Low < 10 · Medium 11–19 · High ≥ 20.
GL reflects actual portion sizes.
Calculate Your Glycemic Load
Glycemic Load
What Is Glycemic Load?
Glycemic index (GI) ranks how fast a food's carbohydrates raise blood sugar on a 0–100 scale. But GI ignores portion size, the flaw glycemic load corrects.
Glycemic load multiplies GI by actual grams of carbohydrate in a serving, giving the real metabolic impact of what you actually eat.
How It Is Calculated
GL = GI × grams of carbohydrate ÷ 100
Example: Example: watermelon GI 72 × 12 g carbs/serving → GL ≈ 8.6 (low)
GI vs GL in practice
| Food | GI | Typical serving GL |
|---|---|---|
| Watermelon | 72 (high) | 8 (low) |
| White bread | 75 (high) | 23 (high) |
| Apple | 36 (low) | 6 (low) |
| Baked potato | 85 (high) | 26 (high) |
| Lentils | 32 (low) | 5 (low) |
Limitations
- GI values vary by ripeness, cooking, and individual response.
- GL assumes isolated servings, mixed meals change the response.
- People with diabetes should base decisions on measured glucose and clinician guidance.
Sources & Review
References used for this calculator’s formulas and thresholds:
Glycemic Load FAQ
What is the difference between GI and GL?
GI rates the speed of a food's carbs per 50 g; GL multiplies GI by the actual carbs eaten, so it reflects real portions.
What is a good glycemic load?
Keep daily GL under about 80–120, and individual foods under 10 where possible.
Should I avoid high-GI foods?
Not necessarily — portion and pairing matter. High-GI foods with protein, fat, or fiber (and in small servings) have modest impact.
Does low GL help weight loss?
Low-GL diets improve satiety and blood-sugar stability, which supports adherence, the mechanism that actually drives weight loss.
A note before you begin: this tool offers educational estimates only. It cannot replace advice from your doctor or another qualified professional.