Butter glycemic index
Butter has no measurable glycemic index: a 10 g serving (2 teaspoons) has only 0 g of available carbohydrate, so its glycemic load is about 0 and it barely raises blood sugar on its own.
Also known as: unsalted butter
- Serving10 g
- Available carbs0 g
- Fiber0 g
- Sugars0 g
- Protein0.1 g
- Calories72 kcal
Serving: 2 teaspoons.
What to know
Butter is almost pure fat and has no GI. Adding fat to a carbohydrate food lowers its GI, but not its calories.
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Frequently asked questions
Does butter have a glycemic index?
Not a measurable one. GI can only be tested in foods with enough carbohydrate: the test needs a 25 or 50 g carbohydrate portion. Butter has 0.1 g per 100 g, so its direct effect on blood sugar is minimal and its glycemic load is about 0.
Does butter raise blood sugar?
Barely, on its own. What matters more is what you eat it with: bread, rice, potatoes, sauces or sugary drinks. Pairing carbohydrate foods with protein, fat or fiber tends to soften the rise.
How many carbs are in butter?
A 10 g serving has about 0 g of total carbohydrate, including 0 g of fiber, leaving 0 g of available carbohydrate (the part that raises blood sugar). Per 100 g: 0.1 g of carbohydrate.
Nutrition facts
| per 100 g | Serving (10 g) | |
|---|---|---|
| Calories | 717 kcal | 72 kcal |
| Carbohydrates | 0.1 g | 0 g |
| Available carbs | 0.1 g | 0 g |
| Fiber | 0 g | 0 g |
| Sugars | 0.1 g | 0 g |
| Protein | 0.9 g | 0.1 g |
| Fat | 81 g | 8.1 g |
Source: USDA FoodData Central, Butter, without salt (SR Legacy, FDC 173430). 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.