Carbs in Hamburger Bun: The Quick Answer
Hamburger Bun contains 46.9g of net carbs per 100g, calculated by subtracting 2.3g of dietary fiber from 49.2g of total carbohydrates. With 267.0 calories, 9.4g protein, and 3.6g fat per 100g, it is classified as High Carbs for carbohydrate content.
Net carbs — not total carbs — are what matter for keto and low-carb diets. Only net carbs raise blood sugar and affect insulin, which is why tracking them accurately is key to staying in ketosis. Use our Keto Macro Calculator to find your daily net carb limit based on your body and goals.
Is Hamburger Bun Keto Friendly?
Hamburger Bun is high in carbs with 46.9g net carbs per 100g. It is generally not suitable for strict keto (under 20g net carbs/day) but may fit into a broader low-carb diet depending on portion size and your daily limit.
Best Low-Carb Swaps for Hamburger Bun
Hamburger Bun is high in carbs. If you're eating low-carb or keto, these swaps deliver the same satisfaction with a fraction of the net carbs.
| Instead of | Try this | Why it helps |
|---|---|---|
| Hamburger bun (~25g net carbs) | Lettuce wrap (iceberg or butter lettuce) | Wraps a burger perfectly — crisp, fresh, zero carbs |
| Burger bun | Portobello mushroom cap (broiled) | Hearty, umami-rich, holds a patty firmly — ~3g net carbs |
| Slider buns | Cloud bread rounds | Egg-based bun, ~1g net carb each, toasts well |
| Bun with sesame seeds | Almond flour bun | Closest to the real thing at ~4g net carbs |
How Net Carbs Are Calculated
Net carbs are calculated by subtracting dietary fiber (and sugar alcohols, if present) from total carbohydrates: Net Carbs = Total Carbs − Fiber. For Hamburger Bun: 49.2g − 2.3g = 46.9g net carbs per 100g.
Dietary fiber is subtracted because it passes through the digestive system without being absorbed as glucose. It does not raise blood sugar or trigger an insulin response, making it irrelevant for carb counting on keto and low-carb diets.