Potassium · Food Composition Guide

Avocado and Potassium: A Guide to Portions and Food Labels

Avocado ranks among the most cited potassium-rich foods, but food labels can be confusing. Nutrition databases report values per 100 grams while labels show per serving—and a typical half-avocado serving weighs considerably less than 100 grams. According to USDA FoodData Central, a 68-gram serving of Hass avocado provides roughly 345 mg of potassium, about 7% of the 4,700 mg daily Adequate Intake recommended by the NIH Office of Dietary Supplements. Here is what that number means—and what food composition data cannot tell you on its own.

By Marion Ellis

Health & Nutrition Desk · Updated October 2026 · 8 min read

Half an avocado sliced onto toast, mixed into a salad, or mashed into guacamole is a familiar part of many Americans’ diets—and many people are aware that avocado is frequently described as a potassium-rich food. But when someone reads a label claiming “485 mg of potassium per 100g” and then checks a nutrition tracking app that says “345 mg per serving,” it is reasonable to wonder: which number is right?

Both are. They measure different things. Understanding the distinction matters if you are trying to read food labels accurately or compare potassium content across different foods.

Per 100 grams vs. per serving: what each number means

The per-100-gram format is a standardized reference unit. It allows you to compare potassium density across foods of very different serving sizes on a level playing field. It is the format used in research databases like USDA FoodData Central and in scientific literature.

The per-serving format is what appears on food labels in the United States, as defined by FDA labeling rules. The serving size reflects a “reference amount customarily consumed”—approximately how much people typically eat in one sitting. For Hass avocado, the FDA reference serving is one-fifth of a medium fruit (approximately 30 grams); nutrition labels also commonly show half a medium avocado (approximately 68 grams) as the labeled serving size.

According to USDA FoodData Central (FDC ID 171705), Hass avocado contains approximately 485 mg of potassium per 100 grams of edible portion. At a 68-gram half-avocado serving, that translates to roughly 330–345 mg. Neither number is wrong; they answer different questions.

Source: USDA FoodData Central. Values are approximate; exact amounts vary by fruit ripeness, weight, and measurement method. AI = Adequate Intake per NIH ODS.

How avocado compares to other high-potassium foods

Avocado is a meaningful source of potassium, but several foods rank considerably higher by typical serving. The NIH Office of Dietary Supplements Potassium Fact Sheet lists the following selected foods:

• Cooked white beans (~1,189 mg per half-cup, cooked)
• Baked potato with skin (~952 mg per medium potato)
• Cooked acorn squash (~896 mg per cup, cubed)
• Dried apricots (~756 mg per half-cup)
• Cooked lentils (~731 mg per half-cup, cooked)
• Prune juice (~707 mg per 3/4 cup)
• Carrot juice (~689 mg per 3/4 cup)
• Cooked spinach (~572 mg per half-cup, cooked)
• Plain nonfat yogurt (~579 mg per 8 oz)
• Half medium avocado (~345 mg per ~68g serving)
• Medium banana (~422 mg per banana)
• Cooked sweet potato (~542 mg per medium potato)

Avocado is a convenient, versatile source. But if potassium intake is a priority in your diet, legumes and root vegetables offer substantially more per serving.

What food composition data cannot tell you

A frequent mistake in nutrition reading is to treat food composition numbers as if they were measures of clinical outcome. They are not. Knowing that a serving of avocado contains 345 mg of potassium tells you something about the food; it does not tell you:

• How much potassium you absorb. Bioavailability—the fraction of a nutrient that the body actually absorbs and uses—varies by individual, gut health, food preparation method, and what else is eaten at the same meal.
• Whether your dietary pattern is adequate overall. Potassium intake is a function of your entire diet over time, not of any single food. Most American adults fall short of the 4,700 mg daily Adequate Intake, according to NIH ODS data.
• Your current nutritional status. Assessing whether an individual has adequate potassium, or whether potassium intake is relevant to their blood pressure picture, requires clinical evaluation—diet recall, blood and urine panels, medication review, kidney function testing, and medical history. A food label cannot do this.

Potassium, sodium, and the dietary ratio

Nutrition researchers often discuss the potassium-to-sodium ratio in the diet rather than potassium in isolation. The standard American diet tends to be high in sodium (average ~3,400 mg/day, well above the recommended 2,300 mg) and low in potassium (average ~2,320 mg for women, ~3,016 mg for men, per NIH ODS). That ratio is roughly the inverse of what research associates with favorable cardiovascular nutritional patterns.

Avocado supports a better ratio on both sides: it is a potassium-rich food that is naturally low in sodium. Replacing processed, high-sodium foods with whole foods like avocado, leafy greens, legumes, and sweet potatoes shifts the dietary ratio in a direction that population research has consistently associated with healthier cardiovascular outcomes, though individual results depend on the total dietary pattern.

The FDA-authorized qualified health claim for potassium states that “diets containing foods that are good sources of potassium and low in sodium may reduce the risk of high blood pressure and stroke.” This claim applies to the dietary pattern, not to any individual food or supplement.

Putting it into practice: building a potassium-conscious diet

If you want to increase potassium through food choices, a practical approach includes:

• Anchor meals with legumes. White beans, lentils, and chickpeas are calorie-efficient, budget-friendly, and among the highest-potassium foods per serving.
• Keep root vegetables in rotation. Baked potato (with skin), sweet potato, and winter squash provide large amounts of potassium alongside fiber.
• Use avocado and banana as convenient boosts. They are portable, do not require cooking, and add meaningful potassium to a meal or snack.
• Read sodium alongside potassium. Canned beans have high potassium but can also be high in added sodium; rinsing reduces sodium by about 40%, per USDA data, while preserving most of the potassium.
• Replace processed snacks. The biggest lever on the potassium-to-sodium ratio is often reducing ultra-processed snack foods rather than adding specific potassium foods.