Potassium is a vital mineral that supports nerve signaling, muscle contraction, and healthy blood pressure. Fruits are among the best natural sources, but their potassium content varies widely — from about 90 mg per 100 g in apples to over 600 mg in dried apricots. This calculator helps you estimate the potassium you get from a specific serving of fruit, whether you're tracking daily intake, managing kidney health, or planning a balanced diet.
Simply choose a fruit from the dropdown, enter your serving size, and select the unit (grams, ounces, cups, or pieces). The tool instantly calculates the potassium content and also shows the percentage of your daily value (based on a 4,700 mg reference). You can compare multiple fruits, adjust serving sizes, and use the quick-fill buttons for common portions. Ideal for dietitians, fitness enthusiasts, and anyone curious about their micronutrient intake.
🍌 Fruit Potassium Calculator
📊 Results
How to Use This Tool
Using the Fruit Potassium Calculator is straightforward. Start by selecting a fruit from the dropdown list — it includes common fresh fruits, dried fruits, and even avocado (technically a fruit). Next, enter your serving size in the number field and choose the unit: grams, ounces, cups, or pieces. The calculator automatically converts your serving to grams using standard reference weights for each fruit. For example, if you select "Banana" and enter "1" with unit "piece", it uses the average weight of a medium banana (118 g). If you prefer to work in cups, the tool uses typical cup weights from USDA food composition databases.
After clicking the blue "Calculate Potassium" button, you'll see three pieces of information: the total potassium in milligrams, the percentage of the daily value (based on a 4,700 mg reference for adults), and a breakdown showing the approximate weight of your serving and the potassium density of the fruit. The reset button clears all inputs and results, so you can quickly try different fruits or serving sizes.
How It Works
The calculator relies on potassium values per 100 grams of edible portion, sourced from the USDA FoodData Central database. For each fruit, we store a fixed value (e.g., banana = 358 mg/100g, avocado = 485 mg/100g). When you enter a serving, the tool converts it to grams using the selected unit and then applies the formula:
Potassium (mg) = (Potassium per 100 g ÷ 100) × Serving weight (g)
For unit conversions, we use standard reference weights: 1 ounce = 28.3495 grams, and cup weights vary by fruit because density differs (e.g., 1 cup of sliced banana weighs about 150 g, while 1 cup of whole strawberries weighs about 152 g). Piece weights are based on typical medium-sized fruit portions. The daily value percentage is calculated against the FDA's reference of 4,700 mg for adults, which is the amount used on nutrition labels.
Worked Examples
Example 1: Banana — You eat one medium banana (118 g). Potassium = (358 ÷ 100) × 118 = 422 mg. That's about 9% of your daily value.
Example 2: Dried Apricots — A 40 g handful of dried apricots. Potassium = (1162 ÷ 100) × 40 = 465 mg. That's nearly 10% of your daily value, showing how concentrated potassium is in dried fruit.
Example 3: Watermelon — A 200 g slice of watermelon. Potassium = (112 ÷ 100) × 200 = 224 mg. That's only about 5% of your daily value, making watermelon a lower-potassium option.
Tips & Best Practices
- For accuracy, weigh your fruit on a kitchen scale rather than relying on visual estimates. A "medium" banana can vary from 100 to 140 g.
- If you're tracking potassium for kidney disease, always consult your healthcare provider or renal dietitian, as individual needs vary widely.
- Dried fruits like raisins, prunes, and dates are potassium powerhouses — a small serving can add up quickly. Be mindful of portion sizes.
- Boiling fruits can leach some potassium into the water, but most people eat fruit raw, so the values here reflect raw fruit.
- Use the quick-fill buttons to quickly compare 100 g, 1 cup, or 1 piece across different fruits.
Factors Affecting Accuracy
Potassium content can vary due to several factors: growing conditions, soil quality, ripeness, and variety. For instance, a ripe banana may have slightly higher potassium than a green one. The values used are averages from the USDA, so your actual fruit may differ by 10-20%. Additionally, cup weights are approximations — if you pack sliced fruit tightly, the weight increases. For the most precise tracking, weigh your food in grams. Also note that the daily value of 4,700 mg is a general guideline; the adequate intake for adults is 3,400 mg for men and 2,600 mg for women, but the FDA uses 4,700 mg for labeling purposes.
Frequently Asked Questions
Which fruit has the most potassium?
Among the fruits in this calculator, dried apricots top the list with 1,162 mg per 100 g, followed by raisins (749 mg), prunes (732 mg), and dates (656 mg). Among fresh fruits, avocado leads with 485 mg per 100 g, then banana (358 mg) and kiwi (312 mg).
Is avocado a fruit?
Yes, botanically avocado is a fruit, and it's an excellent source of potassium — even more than bananas per 100 g. It also provides healthy monounsaturated fats.
Can I use this calculator for meal planning?
Absolutely. You can estimate the potassium contribution of fruit to your daily intake. For a full meal, you'd need to add potassium from vegetables, dairy, and other foods. You might also find our bulgur potassium calculator useful for whole grains.
Why is potassium important?
Potassium helps regulate fluid balance, nerve signals, and muscle contractions. Adequate intake is linked to lower blood pressure and reduced risk of kidney stones. Most adults need about 2,600-3,400 mg per day, but the FDA label uses 4,700 mg as the daily value.
Additional Resources
For more detailed nutritional data, visit the USDA FoodData Central database, which provides comprehensive nutrient profiles for thousands of foods. The NIH Office of Dietary Supplements offers evidence-based information on potassium and health. If you're managing a medical condition, always consult a registered dietitian.