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Glycemic Load (GL) Calculator

Calculate glycemic load — a more practical measure than GI alone. GL = (GI × carbs per serving) / 100. GL accounts for portion size: a food with high GI may have low GL if the serving is small.

Concept Fundamentals
<10
Low GL
11-19
Medium GL
≥20
High GL

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Key values and context for this tool: • Low GL: <10 • Medium GL: 11-19 • High GL: ≥20

Key values
<10
Low GL
Key value
11-19
Medium GL
Key value
≥20
High GL
Key value

Ready to run the numbers?

Why: Calculate glycemic load for meal planning.

How: Enter your values in the calculator fields below, keep units consistent, then run the calculation to see results and any step-by-step work shown on this page.

Run the calculator when you are ready.

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For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.

Glycemic load (GL) = (GI × carbs per serving) / 100. It's a more practical measure than GI alone because it accounts for portion size. A food with high GI may have low GL if the serving is small. Low GL <10, medium 11-19, high ≥20. Use GL for meal planning and diabetes management.

<10
Low GL
11-19
Medium GL
≥20
High GL
GI×C/100
Formula

Key Takeaways

  • • GL = (GI × carbs in portion) / 100 — accounts for both quality and quantity.
  • • Low GL <10: minimal blood sugar impact per serving.
  • • Medium GL 11-19: moderate impact — watch portion size.
  • • High GL ≥20: significant spike — combine with protein/fat or reduce portion.

Did You Know?

🔢 Watermelon: high GI (72) but low GL (4-7 per cup) — few carbs per serving.
📊 White rice: high GI and high carbs → high GL. Smaller portions help.
💡 Carrots: medium GI but very low carbs → very low GL per serving.
🌍 Daily GL &lt;100 is often recommended for general health.
📈 GL predicts post-meal glucose better than GI alone for mixed meals.
🎯 Aim for GL &lt;10 per snack, &lt;20 per meal for diabetes.

How Does GL Work?

1. Formula

GL = (GI × digestible carbs in serving) / 100. Carbs in portion = (carbs per 100g × portion g) / 100.

2. Why Portion Matters

Same food, different portions = different GL. A small serving of high-GI food can have low GL.

3. Practical Use

Use GL for meal planning. Target <10 per snack, <20 per meal for stable blood sugar.

Expert Tips

Don't avoid high-GI fruits — check GL. Watermelon and cantaloupe have low GL per serving.
Reduce portion size of high-GL foods rather than eliminating them entirely.
Pair high-GL foods with protein, fat, or vinegar to blunt the glucose spike.
Track GL per meal for diabetes — it complements carb counting and insulin dosing.

GL Ranges

CategoryGL RangeImpact
Very Low≤5Minimal
Low6-10Low
Medium11-19Moderate
High≥20Significant

Frequently Asked Questions

What is glycemic load?

Glycemic load (GL) = (GI × carbs per serving) / 100. It accounts for portion size. A food with high GI may have low GL if the serving is small (e.g., watermelon). Low GL &lt;10, medium 11-19, high ≥20.

How is GL calculated?

GL = (Glycemic Index × grams of digestible carbs in the serving) / 100. First find carbs in your portion: (carbs per 100g × portion in g) / 100. Then multiply by GI and divide by 100.

Why use GL instead of GI alone?

GI shows quality (how fast); GL shows quantity (total impact). Watermelon has high GI (72) but low GL (4 per cup) because it has few carbs per serving. GL is more practical for meal planning.

What is a good GL per meal?

Low GL &lt;10 per serving. Aim for &lt;20 per meal for diabetes management. Daily GL &lt;100 is often recommended. Combine low-GL foods with protein and fat for stable blood sugar.

How does GL help diabetes?

GL predicts blood sugar impact better than GI alone. Meals with GL &lt;10 cause minimal spikes. Use GL for insulin dosing and meal planning alongside carb counting.

Can this replace medical advice?

No. This calculator is for educational purposes. Diabetics should work with a healthcare provider for meal planning and medication. Not a substitute for professional medical consultation.

Key Statistics

<10
Low GL
11-19
Medium GL
≥20
High GL
<100
Daily GL

Official Data Sources

Harvard Health ↗
GL and nutrition
Sydney University GI ↗
GI/GL database
ADA ↗
Diabetes nutrition
PubMed ↗
GL research

⚠️ Disclaimer: This calculator is for educational purposes only. It is not a substitute for professional medical advice. Diabetics should work with a healthcare provider for meal planning and medication.

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