Celery is a low-calorie, hydrating vegetable, but it is often assumed to be a rich source of iron. In reality, raw celery contains only about 0.22 mg of iron per 100 grams, which means a typical medium stalk delivers a modest 0.09 mg. This iron calculator helps you translate a serving of celery — whether weighed in grams, ounces, cups, or stalks — into a precise milligram value.
You can then compare that amount to the U.S. Daily Value of 18 mg or to your personal iron target, such as 8 mg for adult men, 18 mg for premenopausal women, or 27 mg during pregnancy. The calculator also shows how much celery would be required to reach your full daily iron target, which makes it easier to see why pairing this vegetable with well-planned meals matters.
Use the tool for meal logging, nutrition assignments, or simple curiosity about micronutrient intake — no nutrition science degree required. Just enter the amount, pick a serving unit, choose a target profile, and press calculate.
Celery Iron Calculator
Estimate the iron content of raw celery in any serving size, compare it to daily targets, and see how much celery would meet your needs.
How to Use This Tool
Start by entering the amount of raw celery you want to evaluate. The calculator accepts four common units:
- Grams (g) — best for food scale measurements and recipe math.
- Ounces (oz) — handy in the U.S., where many recipes and food labels use ounces.
- Cups (chopped) — an easy volume measurement if you are prepping a salad or soup base; the calculator uses the standard USDA weight of 101 g per cup of chopped celery.
- Medium stalks — the most intuitive unit for snacking; one medium stalk weighs about 40 g.
After choosing a unit, select the iron target that matches your life stage from the dropdown. The predefined targets are based on the RDA values published by the National Institutes of Health Office of Dietary Supplements: 8 mg for adult men and postmenopausal women, 18 mg for premenopausal women, 11 mg for teenage boys, 15 mg for teenage girls, 27 mg during pregnancy, and 10 mg while lactating. The calculator then reports your serving’s iron, its percentage of the generic Daily Value, and its percentage of your chosen target.
For quick checks, use the preset buttons to fill in common portions — 1 stalk, 100 g, 1 cup, or 3.5 oz. Press Calculate Iron to see results, and Reset to start over. Results are rounded to three decimals for milligrams and one decimal for percentages.
Iron in Celery: The Numbers
Celery is about 95% water, which explains both its satisfying crunch and its low mineral density. The USDA FoodData Central database lists 0.22 mg of iron per 100 g of raw celery. That places celery near the lower end of vegetable iron content, far behind spinach at about 2.7 mg per 100 g, lentils, and many beans. This does not make celery “bad” — it simply means it contributes useful micronutrients like vitamin K, potassium, and folate without meaningful calories, but iron is not its strength.
The table below summarizes approximate weights and iron values for common celery portions. Your actual stalk will vary with size and water content; using a food scale gives the most accurate result.
| Celery portion | Approx. weight | Iron content |
|---|---|---|
| 1 medium stalk (7–8 in) | 40 g | 0.088 mg |
| 1 small stalk | 17 g | 0.037 mg |
| 1 large stalk | 64 g | 0.141 mg |
| 1 cup chopped | 101 g | 0.222 mg |
| 3.5 oz (about 100 g) | 99.2 g | 0.218 mg |
| 1 oz | 28.35 g | 0.062 mg |
Worked Examples
Example 1: One medium stalk. A 40 g stalk contains 40 g × 0.22 mg/100 g = 0.088 mg of iron. For an adult man with an 8 mg target, this is 0.088 ÷ 8 × 100 = 1.1% of his daily target — about one percent. You would need roughly 3.6 kg, or about 90 stalks, to hit 8 mg, which shows celery alone is not a practical iron source.
Example 2: Two cups of chopped celery in a stir-fry. Two cups weigh about 202 g. Iron = 202 g × 0.22 mg/100 g = 0.44 mg. Against the 18 mg Daily Value, that is 2.5%. It still counts, but you would need nearly 8.2 kg of celery to meet the full 18 mg from this vegetable alone.
Example 3: Pregnant woman, 100 g snack. A 100 g portion has 0.22 mg. Against a 27 mg pregnancy target, that is 0.8%. This reinforces why prenatal supplements and iron-rich foods like lean red meat, fortified cereals, beans, and spinach belong in a pregnancy diet.
Factors Affecting Iron Absorption
Celery contains non-heme iron, the plant form of iron that the body absorbs less efficiently than the heme iron found in meat, poultry, and fish. According to the NIH Office of Dietary Supplements, absorption of non-heme iron is typically 2–20%, depending on your iron status and the meal’s composition. Several food factors can shift that number:
- Vitamin C enhances absorption. Adding lemon juice, bell peppers, tomatoes, or a small glass of orange juice to a celery-based meal can noticeably improve non-heme iron uptake.
- Tannins inhibit absorption. Drinking black tea, green tea, or coffee around the same time as an iron-poor meal can reduce absorption; move these beverages an hour away from iron-containing meals.
- Calcium and phytates can interfere. Dairy products, calcium-fortified juices, and whole grains eaten in very large amounts may bind iron.
- Your body adapts. People who are iron-deficient absorb a higher percentage of available non-heme iron; people with adequate stores absorb less.
Because celery’s starting iron dose is small, absorption modifiers matter less in absolute terms here than with higher-iron plant foods. If you track iron for athletic performance, the sports iron calculator can help you estimate exercise-related needs.
Frequently Asked Questions
Is celery a good source of iron? No — celery is a low-iron vegetable. A 100 g portion provides about 0.22 mg, which is roughly 1% of the 18 mg Daily Value. It is valuable in the diet for hydration, fiber, vitamin K, and flavor, but it should not be counted on as a primary iron source.
How much celery would I need to eat to meet my daily iron? For a target of 8 mg, you would need about 3.6 kg, or about 90 medium stalks. For 18 mg, about 8.2 kg, or over 200 stalks. This is why clinicians recommend iron-focused foods rather than celery for treating or preventing deficiency.
Does cooking celery change its iron content? Cooking can concentrate or dilute iron depending on water absorption or loss. Braised celery that absorbs liquid may weigh more but keep the same absolute iron, lowering iron per 100 g; boiling can leach some minerals into the water. These changes are small because the starting value is low. For the most consistent tracking, weigh raw celery before cooking.
Can I improve iron absorption from celery? Yes. Pair it with vitamin C-rich foods and avoid consuming tea, coffee, or calcium-heavy foods at the same time. These practices matter more for iron-rich plant meals, but they apply to celery too.
What foods are high in iron? Excellent sources include lean red meat, shellfish such as clams and mussels, organ meats, fortified breakfast cereals, lentils, beans, tofu, pumpkin seeds, and dark leafy greens. If you track other iron-containing foods for comparison, the mussel iron calculator offers another plant and seafood perspective. For clinical guidance, the NIH Iron Health Professional fact sheet is an authoritative reference.
Celery’s modest iron content is not a reason to avoid this crunchy vegetable. It is a great low-calorie snack, and knowing its exact micronutrient contribution helps you build a balanced plate without overestimating what it delivers.