Stir-fries can pack a surprising amount of potassium into one pan. Chicken, tofu, broccoli, mushrooms, spinach, and cashews are common stir-fry ingredients that contribute meaningful amounts of this electrolyte. Knowing how much ends up on your plate helps with meal planning, kidney-friendly diet limits, or just balancing your daily nutrients.
This calculator estimates potassium from a single ingredient at a time. Choose the ingredient closest to your stir-fry, enter the amount you cook with, and set the number of servings. You get total potassium, potassium per serving, its share of the Daily Value, and a quick banana-equivalent comparison. Run it once for each ingredient in a mixed stir-fry, then add the results for the full batch.
Values come from average USDA FoodData Central data, so the tool works well for home cooks, nutrition trackers, and anyone curious about the potassium content of a quick stir-fry. It is a planning estimate, not a substitute for lab-tested medical nutrition advice.
🍳 Stir Potassium Calculator
Pick an ingredient, enter the amount in your pan, and get potassium totals per batch and per serving.
Values are averages from USDA FoodData Central; actual potassium varies by brand, variety, and cooking method.
Step-by-Step Guide
Using the calculator takes about ten seconds. Start by choosing the ingredient in the first dropdown — the list covers common stir-fry proteins, vegetables, noodles, and nuts. Next, enter the amount used in grams. If your recipe calls for 1½ cups of broccoli, weigh it when possible; a food scale gives the most reliable result. If you don't have a scale, use the quick-pick buttons as a rough starting point — they load typical portions for common stir-fry ingredients. Finally, enter how many servings the batch makes and click Calculate Potassium.
- For a single ingredient: the result area shows total potassium, potassium per serving, % DV, and a banana-equivalent comparison.
- For a mixed stir-fry: run the calculator once per ingredient and add the totals. If the serving count is the same, you can simply add the per-serving numbers.
- All results are rounded to the nearest whole milligram for clarity.
Worked Examples
Example 1 — Chicken and broccoli stir-fry. Suppose you make a classic stir-fry with 200 g cooked chicken breast, 150 g broccoli, and 100 g white mushrooms, and you want 2 servings. Run the tool three times: Chicken: (200 ÷ 100) × 360 = 720 mg. Broccoli: (150 ÷ 100) × 316 = 474 mg. Mushrooms: (100 ÷ 100) × 318 = 318 mg. Total: 720 + 474 + 318 = 1,512 mg. Per serving: 756 mg, about 16.1% of the 4,700 mg Daily Value.
Example 2 — A lighter stir-fry. Now try 150 g cooked rice noodles, 120 g firm tofu, and 80 g carrots. Rice noodles: (150 ÷ 100) × 14 = 21 mg. Tofu: (120 ÷ 100) × 150 = 180 mg. Carrots: (80 ÷ 100) × 320 = 256 mg. Total: 457 mg, or about 9.7% DV. Split across 2 servings, that's about 228.5 mg per plate — a much lighter potassium load than the chicken and broccoli version.
How the Estimate Is Calculated
Each ingredient in the dropdown has an average potassium concentration in milligrams per 100 grams, taken from USDA FoodData Central. The calculation is a simple proportion: multiply the concentration by the number of grams used and divide by 100. Then divide by the number of servings to get the per-serving amount.
Why per 100 g? Nutrition databases standardize nutrient values this way so foods can be compared directly, no matter what serving size a manufacturer prints on the label. Because the math is linear, doubling the amount simply doubles the potassium.
Reference Potassium Values
These are rounded average values from USDA FoodData Central. Use them for meal planning, not as laboratory results.
| Ingredient | Approx. K per 100 g |
|---|---|
| Spinach (raw) | 558 mg |
| Cashews (dry roasted) | 660 mg |
| Chicken breast (cooked) | 360 mg |
| White mushrooms | 318 mg |
| Broccoli | 316 mg |
| Carrots | 320 mg |
| Zucchini | 261 mg |
| Bok choy | 252 mg |
| Bell pepper | 211 mg |
| Snap peas | 200 mg |
| Firm tofu | 150 mg |
| Rice noodles (cooked) | 14 mg |
Values vary by cultivar, season, brand, and cooking method. The table is a quick reference, not a guarantee.
Tips for Lower-Potassium Stir-Fries
- Trim the big contributors. Spinach, cashews, mushrooms, and carrots are the highest on the list. A handful instead of a pile keeps the total moderate.
- Dilute with neutral fillers. Rice and rice noodles are very low in potassium and stretch the dish into more servings, lowering potassium per plate.
- Drain and rinse canned ingredients. Some potassium leaches into canning liquid, and rinsing can lower the amount further.
- Watch the sauces. Soy sauce, fish sauce, and bottled stir-fry sauces add potassium; a tablespoon of soy sauce contributes roughly 30 mg. Use them mindfully when tracking.
- Keep cooking method in mind. Boiling removes more potassium than stir-frying because potassium is water-soluble and leaves the food in the cooking water. Since stir-fry uses dry heat, almost all the potassium stays in the food — so portion size matters even more.
- Confirm personal limits with a professional. If you are on a potassium-restricted diet, check your individual targets with a doctor or renal dietitian before relying on any estimate.
Frequently Asked Questions
Why is potassium listed per 100 g? It is the standard format in nutrition databases. It lets you compare foods directly regardless of the serving size printed on a label or used in a recipe.
Should I weigh ingredients raw or cooked? Use the form that matches the database entry. Vegetables like broccoli and spinach are listed raw in this tool, so weigh them raw. Chicken, beef, and shrimp are cooked values, so weigh them after cooking.
How accurate is this for kidney-friendly meal planning? It is a useful planning estimate, but actual potassium varies with soil, variety, ripeness, processing, and preparation. For clinical decisions, use values supplied by a renal dietitian or the food label when available.
Is stir-frying different from boiling for potassium? Yes. Boiling leaches water-soluble potassium into the cooking liquid, so much of it is discarded. Stir-frying uses dry heat, so most of the potassium remains in the food; that is why portion control is especially important here.
The underlying analytical data can be searched directly at USDA FoodData Central.