Weetabix glycemic index
Weetabix has a glycemic index of 71, which is high. A 30 g serving (1 bowl, dry) has a glycemic load of 15 (medium).
Also known as: Weet-Bix, wheat biscuits
- Serving30 g
- Available carbs21 g
- Fiber3.4 g
- Sugars1.7 g
- Protein3.4 g
- Calories111 kcal
Serving: 1 bowl, dry.
What to know
Plain wheat biscuit cereals averaged a high GI of 71 across six tests, despite being whole grain. The fine milling and flaking speed up digestion.
Glycemic load by portion size
GI stays the same whatever you eat, but glycemic load scales with the amount: eating twice as much doubles the effect on blood sugar.
| Amount | Available carbs | Glycemic load | |
|---|---|---|---|
| 50 g | 35 g | 25 | High |
| 100 g | 70 g | 50 | High |
| 30 g · 1 bowl, dry | 21 g | 15 | Medium |
| 60 g · double serving | 42 g | 30 | High |
What the studies found
The value of 71 is the mean calculated by the authors of the International Tables of Glycemic Index (2021) across 6 studies. Results are fairly consistent (69 to 75).
Each dot is one study. Green dots followed the ISO 26642 standard method.
- 69 · Australia 2004
- 69 · Australia 2001
- 75 · Canada 1981
- 75 · Canada 1992
Weetabix compared with other breakfast cereals
Lower-GI swaps
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Frequently asked questions
Is weetabix low glycemic?
No. With a GI of 71, weetabix is in the high range (70 or more). Low GI is 55 or less.
What is the glycemic load of weetabix?
A 30 g serving (1 bowl, dry) has a glycemic load of 15, which is medium. Glycemic load combines GI with the amount of carbohydrate in the portion: 10 or less is low, 11 to 19 medium and 20 or more high.
Can people with diabetes eat weetabix?
With a GI of 71 and a medium glycemic load per serving, weetabix can be part of a diabetes-friendly diet with attention to portion size and pairing it with protein, fat or fiber. Everyone responds differently, so talk to your doctor or dietitian about your plan.
How many carbs are in weetabix?
A 30 g serving has about 24 g of total carbohydrate, including 3.4 g of fiber, leaving 21 g of available carbohydrate (the part that raises blood sugar). Per 100 g: 81.5 g of carbohydrate.
Nutrition facts
| per 100 g | Serving (30 g) | |
|---|---|---|
| Calories | 371 kcal | 111 kcal |
| Carbohydrates | 82 g | 24 g |
| Available carbs | 70 g | 21 g |
| Fiber | 11 g | 3.4 g |
| Sugars | 5.7 g | 1.7 g |
| Protein | 11 g | 3.4 g |
| Fat | 2.9 g | 0.9 g |
Source: USDA FoodData Central, Cereals ready-to-eat, WEETABIX whole grain cereal (SR Legacy, FDC 169040). Available carbohydrate = total carbohydrate minus fiber.
Sources: Atkinson FS, Brand-Miller JC, Foster-Powell K, Buyken AE, Goletzke J. International tables of glycemic index and glycemic load values 2021: a systematic review. Am J Clin Nutr. 2021;114(5):1625–1632. USDA FoodData Central. How we calculate each value: Methodology & sources.
Data last reviewed 2026-09-29.