How Much Sugar Is in a Grapefruit?
Half a grapefruit has about 8.5 g of natural sugar — one of the milder citrus fruits, with a tart edge that makes it taste less sweet than the number suggests.
in 1/2 medium (123 g) · about 2 teaspoons
- Per serving
- 8.5 g
- Per 100 g
- 6.9 g
- Type
- Natural sugar
- In teaspoons
- ≈ 2 tsp
Fine in a portion — worth keeping an eye on.
Half a grapefruit carries roughly 8.5 g of sugar, noticeably less than a whole orange. Much of that restraint comes from naringin, the compound behind grapefruit's bitter edge — it dulls the perceived sweetness even though real sugar is still there. You also get about 2 g of fibre and a full day's vitamin C in that same half.
Grapefruit is one of the better citrus choices for a low-sugar breakfast, especially compared to a glass of orange juice. If the tartness is too much, a light dusting of cinnamon works better than sugar for taking the edge off.
Lower-sugar swaps
- A dusting of cinnamon instead of sugar to soften the tartness
- Reach for grapefruit over orange juice when you want citrus without the liquid sugar hit
Frequently asked questions
- Is grapefruit low in sugar?
- Relatively, yes — at about 6.9 g per 100 g it's one of the milder citrus fruits, lower than a whole orange.
- Why does grapefruit taste bitter as well as sweet?
- A compound called naringin gives grapefruit its bitter edge, which is why it often tastes less sweet than its sugar count suggests.
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Sugar values from USDA FoodData Central; actual amounts vary by brand, ripeness, and recipe. Last updated 2026-08-09.