Quick answer: rice usually has more carbs

For a common serving comparison, 1 cup of cooked white rice has about 45 grams of carbs, while 1 medium baked sweet potato has about 26 grams. Brown rice is similar in total carbs to white rice, often landing in the mid-40s per cup as well.

So if your goal is to reduce carb intake at a meal, sweet potato is often the lower-carb option by serving size. If you want more carbohydrate energy for training or a bigger meal, rice usually gives you more carbs per cup.

Why serving size matters so much

The comparison changes if you measure by weight instead of by common portions. Cooked rice is dense in starch, so a cup can add up quickly. Sweet potatoes contain more water and fiber, which lowers the carb count per bite compared with a cup of rice.

Preparation also matters. A plain baked sweet potato is very different from mashed sweet potatoes with brown sugar or a rice bowl with sauce. Add-ins can make either food much higher in carbs, calories, and total sugar.

Carbs aren’t the whole story

Sweet potatoes usually offer more fiber and more micronutrients than white rice, especially vitamin A in the form of beta-carotene. Brown rice adds more fiber and minerals than white rice, but it still usually contains more carbs than a similar serving of sweet potato.

If you care about blood sugar, the overall meal matters more than one ingredient alone. Protein, fat, fiber, and portion size all affect how quickly carbs are digested and how full you feel afterward.

How to choose based on your goal

Choose rice when you want a larger carb hit in an easy-to-digest form, such as around workouts or when building a higher-calorie meal. Choose sweet potato when you want fewer carbs, more fiber, and a more filling side dish with added nutrients.

If you track food for fitness, a photo-based log can help you estimate portions more consistently. Fitnit’s meal photo recognition can be useful for spotting when portions of rice, potatoes, or add-ons are bigger than they look in real life. For exercise tracking, its phone camera rep counting can also make home workouts easier to follow.

Tips

• Compare foods by the same serving size, not just by eye.
• Use plain cooked rice or plain baked sweet potato when you want the cleanest carb comparison.
• Check labels and recipes for added butter, sugar, or sauces.
• If blood sugar is a concern, pair either food with protein, vegetables, and healthy fats.
• For training meals, choose the option that fits your carb target and digestion comfort.