Asparagus is one of the most nutrient-dense spring vegetables, prized for its fiber, folate, and vitamin K — and it also delivers a respectable dose of potassium, roughly 202 mg per 100 g when raw and 224 mg per 100 g after boiling and draining. This calculator converts any portion — grams, ounces, cups, or individual spears — into an estimated potassium total, so you can log micronutrients quickly and consistently.
Choose your portion size, select whether the asparagus is raw or cooked, and the tool instantly reports potassium in milligrams plus its percentage of the 4,700 mg Daily Value. Quick-fill presets (100 g, 1 cup, 5 spears, 3 oz) make repeat tracking effortless, and the step-by-step breakdown shows exactly how the estimate was derived.
Whether you're a dietitian building renal-friendly meal plans, a fitness enthusiast balancing electrolyte intake, or a home cook curious about vegetable nutrition, this calculator turns vague "it's good for you" claims into concrete numbers you can use.
🥬 Asparagus Potassium Calculator
Estimate the potassium content of fresh or cooked asparagus from any portion size.
Quick Start: Using the Calculator
Enter your portion size in the amount field and choose the matching unit — grams, ounces, US cups of chopped asparagus, or individual medium spears. Then pick the preparation form: raw or cooked (boiled, drained). The form matters because boiling leaches a little potassium into the cooking water and changes how the spears pack. Press Calculate Potassium and the tool shows the total potassium in milligrams, the percentage of the 4,700 mg Daily Value, and a short breakdown of the weight conversion.
- Grams: the most accurate unit — weigh the spears on a kitchen scale.
- Ounces: handy for imperial recipes; 1 oz = 28.35 g.
- Cups: 1 US cup of chopped raw asparagus weighs about 134 g.
- Spears: a medium spear (about 18 cm long) weighs roughly 12 g, so 5 spears ≈ 60 g.
Tip: Use the quick-fill pills to jump straight to common portions, and the copy button to drop the result into your food diary in one click.
How It Works: The Potassium Math
This calculator applies a simple proportional formula to published nutrition data.
Formula: Potassium (mg) = portion weight (g) × potassium per 100 g ÷ 100.
For raw asparagus the tool uses 202 mg per 100 g, the value listed in USDA FoodData Central for fresh asparagus. For boiled, drained spears it uses 224 mg per 100 g. The boiled value looks higher per 100 g because cooking drives off water and concentrates the remaining solids, even though some potassium does dissolve into the cooking water.
Try a worked example: a 1-cup serving of chopped raw asparagus weighs about 134 g, so 134 × 202 ÷ 100 = 271 mg of potassium, roughly 5.8% of the Daily Value. Five medium raw spears (about 60 g) come to just 121 mg, or 2.6% of the DV — a good reminder that potassium is a whole-day nutrient that adds up across many foods.
Reference Table: Potassium in Common Vegetables
To put asparagus in context, the table below gives approximate potassium values per 100 g of common vegetables, based on USDA reference data. Actual values vary with variety, season, and cooking method.
| Vegetable (100 g) | Potassium (mg) |
|---|---|
| Beet greens, cooked | 909 |
| Spinach, raw | 558 |
| Baked potato, flesh and skin | 535 |
| Avocado | 485 |
| Swiss chard, raw | 379 |
| Banana | 358 |
| Broccoli, raw | 316 |
| Tomato, raw | 237 |
| Asparagus, boiled, drained | 224 |
| Asparagus, raw | 202 |
| Cucumber, with peel | 147 |
Values are rounded approximations for planning, not laboratory results.
Tips for Tracking Potassium
Consistent habits make potassium tracking far more reliable. Always record the same preparation form so your daily comparisons are fair. If you use canned asparagus, be aware that canning and draining lowers potassium to roughly 120–140 mg per 100 g, so this calculator will overestimate it — the tool assumes fresh spears. For boiled asparagus, remember that some potassium stays in the cooking water: drain and discard the water if you want to keep potassium lower, or save it for soups and sauces if you are happy to keep it in your intake.
Diet tracking is most useful when you look at the whole plate. If you are also managing energy balance, pair this tool with a calorie needs calculator to plan portion sizes around your goals.
Medical note: People with chronic kidney disease or taking certain blood-pressure medications may need to limit potassium. This tool provides an educational estimate, not medical advice — work out your personal target with a doctor or renal dietitian.
Frequently Asked Questions
Is asparagus a high-potassium food? It is moderate. At roughly 200–224 mg per 100 g it sits below spinach, avocado, and potatoes, but well above cucumber and lettuce. A generous 150 g serving provides about 300–340 mg, or roughly 7% of the 4,700 mg Daily Value.
Why does cooked asparagus show more potassium per 100 g? Boiling removes water, so 100 g of cooked asparagus contains more dried solids (and therefore more potassium) than 100 g of raw asparagus. Total potassium in the whole serving is similar either way; some of it simply moves into the cooking water.
How many spears make 100 g? For medium spears about 18 cm long, expect roughly 8 to 9 spears, since each weighs about 12 g.
Can I use this calculator for frozen asparagus? Roughly yes — frozen spears are packed raw and nutritionally similar to fresh. Steaming or microwaving without excess water will retain more potassium than boiling.
What potassium target should I use? The FDA uses 4,700 mg per day as the labeling Daily Value. The Dietary Guidelines for Americans suggest about 2,600 mg for women and 3,400 mg for men. Therapeutic targets for kidney disease are lower and highly individual — follow your clinician's guidance.