Glycemic Load Calculator
Calculate the glycemic load (GL) of any food. GL accounts for both the glycemic index (GI) and the amount of carbs per serving — a better predictor of blood sugar impact than GI alone.
What's a low, medium, or high GL?
| GL per serving | Category |
|---|---|
| 10 or less | Low (best for blood sugar) |
| 11 – 19 | Medium |
| 20 or more | High (may spike blood sugar) |
GL is a research-backed estimate of a food's blood sugar impact. Individual responses vary based on metabolism, other foods eaten, and activity level.
Why Glycemic Load Matters More Than Glycemic Index
Glycemic Index (GI) measures how quickly a food raises blood sugar, but it doesn’t account for portion size. Watermelon has a high GI of 72 — but because it’s mostly water, a typical serving contains only 11g of carbs, giving it a glycemic load of just 8 (low). Compare that to a slice of white bread (GI 70, 15g carbs, GL 11) or a cup of white rice (GI 73, 45g carbs, GL 33 — high).
For blood sugar management, glycemic load is the better metric because it reflects both the quality of carbs (GI) and the quantity (grams per serving).
How to Use This Calculator
- Find the GI of your food. Databases like the University of Sydney’s Glycemic Index Database list values for thousands of foods.
- Check the carbs per serving on the nutrition label (total carbs, not net carbs).
- Enter both numbers above to see the glycemic load.
Quick Reference: GL of Common Foods
| Food | GI | Carbs (g) | GL | Category |
|---|---|---|---|---|
| Broccoli, 1 cup | 15 | 6 | 1 | Low |
| Strawberries, 1 cup | 40 | 11 | 4 | Low |
| Apple, 1 medium | 39 | 25 | 10 | Low |
| Oatmeal, 1 cup cooked | 55 | 27 | 15 | Medium |
| Banana, 1 medium | 51 | 27 | 14 | Medium |
| White bread, 1 slice | 75 | 15 | 11 | Medium |
| White rice, 1 cup cooked | 73 | 45 | 33 | High |
| Baked potato, medium | 85 | 37 | 31 | High |
| Cornflakes, 1 cup | 81 | 24 | 19 | High |
| Soda, 12 oz | 63 | 39 | 25 | High |
How to Lower the Glycemic Load of Your Meals
- Reduce portion size — halving the carbs halves the GL.
- Add protein and fat — they slow carb absorption and lower the real-world blood sugar response.
- Choose whole grains over refined — they’re usually lower GI and higher fiber.
- Add acidity — vinegar, lemon juice, and fermented foods reduce post-meal glucose spikes.
- Cook al dente — overcooked pasta has a higher GI than al dente pasta.
Daily GL Targets
Research suggests most adults benefit from keeping total daily GL below 100-120. For people with prediabetes or diabetes, aiming for 80-100 is often recommended, spread across 3-5 eating occasions with individual meal GLs of 10-20.
The Bottom Line
Glycemic load gives you a more accurate picture of a food’s real blood sugar impact than glycemic index alone. Use this calculator when you’re unsure whether a particular food or portion size fits your meal plan — and remember, GL is one tool among many. Total carb load, fiber, protein, fat, and your personal glucose response all matter.
