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Elemental iron pediatric dose calculator

Use this Elemental iron pediatric dose calculator to match the prescribed child dose to the exact liquid, tablet, or capsule strength before you give it.

Enter the patient weight in the selected unit.

Select the unit used for the patient weight.

Type to search, or pick from your visible list.

Select the strength of Elemental Iron

Select how many doses are prescribed per day.

Select the prescribed course length in days.

Select the dosage amount in mg/kg/day.

  • All doses are ELEMENTAL iron. Check that your bottle's elemental iron per mL matches: ferrous sulfate 75 mg/mL = 15 mg elemental iron/mL.
  • Once-daily dosing is preferred; recheck hemoglobin at 4 weeks and continue about 2–3 months after correction (CDC).
  • Iron overdose is a leading cause of fatal poisoning in children under 6 — store locked away.

By using the "Calculate Dose" button on pedscalc.com, you acknowledge and agree that while our calculations aim for accuracy, final prescription responsibility lies solely with you, the healthcare provider. pedscalc.com and its operators are not liable for any errors or omissions, or for the results obtained from the use of this information. Always verify calculations and exercise professional judgment.

dose calculator basics

Elemental Iron pediatric dose calculator details

Use this Elemental Iron calculator as the fast parent page for weight-based dose checks, mL conversion, common strengths, and the practical safety steps that generic calculator sites often skip.

Formula

mL per dose = (child weight in kg x prescribed mg/kg/day / doses per day) / medication concentration in mg per mL.

Worked example

For a 20 kg child using 3 mg/kg/day divided 1 time daily with 15 mg/1 mL, calculate the daily mg target, divide by the schedule, then convert that mg amount into mL for the selected product.

Use case
Dosing focus
Practical check
Weight-based dose check
Common calculator choices include 3, 1, 2, 6 mg/kg/day or mg/kg targets depending on the prescription.
Confirm the prescription's dose basis before trusting any mL result.
Strength conversion
Common strengths on this page include 15 mg/1 mL, 44 mg/5 mL, 25 mg/1 mL, 45 mg/5 mL, 50 mg/5 mL.
The same mg target creates a different mL dose when the bottle or tablet strength changes.
Schedule and course
Available schedules include 1, 2 times daily, with course options shown in the calculator.
Match the frequency and duration to the clinician's plan rather than choosing the easiest volume.

Safety checks before using the result

  • Use the exact product strength in hand before measuring the dose.
  • Confirm maximum dose, age limits, and indication-specific cautions when they apply.
  • Escalate urgent symptoms or medication reactions instead of repeating doses from calculator output alone.

Practical dosing guide

Before you measure the dose

Use this page to match the prescribed elemental iron amount to the exact liquid or tablet strength and double-check how it should be given for best absorption.

What it helps with
Elemental iron supplements treat and prevent iron deficiency anemia; dosing is weight-based and often paired with vitamin C to enhance absorption.
Common forms
Common forms include 15 mg elemental iron/mL (ferrous sulfate 75 mg/mL drops), 44 mg elemental iron/5 mL (ferrous sulfate 220 mg/5 mL elixir), and 15 mg chewable tablet.
How the schedule is usually written
Elemental iron is often given in divided doses, depending on the reason it was prescribed.

Elemental Iron pediatric medication summary

Elemental iron supplements treat and prevent iron deficiency anemia; dosing is weight-based and often paired with vitamin C to enhance absorption.

Assess adherence by discussing dosing routine, stool changes, and barriers (taste, GI upset).

Reticulocyte counts should rise within a week; hemoglobin typically increases over 2–4 weeks.

Elemental Iron indications and common pediatric uses

Elemental iron is used to treat pediatric iron deficiency anemia and to restore depleted iron stores when diet alone is insufficient.

Iron deficiency anemia

Iron deficiency anemia: Evaluate for ongoing blood loss or malabsorption if there is no response.

Iron deficiency prophylaxis

Iron deficiency prophylaxis: Continue prophylaxis during high-risk periods and reassess as diet and growth patterns change.

Functional iron deficiency in chronic kidney disease

Functional iron deficiency in chronic kidney disease: Switch to IV iron if oral therapy is ineffective or poorly tolerated.

Post-surgical or inflammatory bowel disease-associated iron deficiency

Post-surgical or inflammatory bowel disease-associated iron deficiency: Coordinate with GI or surgery teams to optimize diet and inflammation control.

Anemia of prematurity (post-discharge)

Anemia of prematurity (post-discharge): Coordinate with primary care for monitoring after discharge.

Restless legs syndrome or periodic limb movement disorder with low ferritin

Restless legs syndrome or periodic limb movement disorder with low ferritin: Use under sleep medicine or neurology guidance when symptoms persist.

How to give Elemental Iron

  • Practical administration guidance for pediatric elemental iron supplementation.
  • When tolerated, give on an empty stomach with water or vitamin C-containing fluid. Separate from milk, calcium, antacids, and other mineral supplements by at least 2 hours (longer when feasible). Use a calibrated oral syringe or dosing device for precision.
  • For infants, direct drops toward the inner cheek to reduce spit-out. If taste or GI upset limits adherence, use a small non-dairy vehicle and clean teeth/gums after dosing to reduce staining.

Elemental Iron side effects, contraindications, and interactions

Most children tolerate oral elemental iron, but gastrointestinal effects are common and can disrupt adherence if families are not coached early. Overdose from accidental ingestion is the main high-severity safety risk and requires urgent action.

Common side effects

  • Set expectations before the first dose: dark stools and mild GI symptoms can occur and are often manageable.
  • Use timing and formulation adjustments for tolerance, but avoid frequent unsupervised dose changes that undermine repletion.
  • Treat all accidental extra ingestion as urgent and contact Poison Control (1-800-222-1222) right away.

Safety checks

  • Iron overload syndromes (hemochromatosis, hemosiderosis): Additional iron accelerates organ damage.
  • Inflammatory bowel disease flare: Oral iron can worsen GI inflammation.
  • Severe abdominal pain or repeated vomiting: Iron overdose can progress rapidly.
  • Confusion or collapse after ingestion: Iron toxicity is life-threatening.
  • No response in hemoglobin after 4-6 weeks: Lack of response suggests misdiagnosis or malabsorption.

Drug interactions

  • Review the full medication list with a clinician or pharmacist before combining therapies.

Elemental Iron mechanism and clinical pearls

Elemental iron provides absorbable substrate for hemoglobin and ferritin repletion. In the proximal small bowel, ferrous iron enters enterocytes through divalent metal transporter 1 (DMT1), then exits via ferroportin to bind transferrin in plasma. Transferrin delivers iron to marrow, where erythroblasts use it for hemoglobin synthesis. Hepcidin is the main gatekeeper: inflammation and recent iron intake can increase hepcidin and reduce next-dose absorption. This is why response is often best when dosing is consistent, interactions are minimized, and inflammation or blood-loss drivers are addressed in parallel.

Always prescribe by elemental iron (not salt weight) and provide a written mL conversion for the exact product the family has at home.

If tolerated, pair doses with a vitamin C source and separate calcium-containing products, antacids, or mineral supplements to avoid absorption loss.

When daily dosing causes persistent GI intolerance, some adolescents may do better with clinician-directed alternate-day schedules while still meeting repletion goals.

Plan follow-up labs up front (early response, hemoglobin trajectory, and ferritin repletion) so families know the treatment has objective milestones.

Frequently asked questions about Elemental Iron

Dark green or black stools are normal while taking iron because unabsorbed iron oxidizes in the gut. Call your clinician only if the stool appears tarry or your child has stomach pain.

Avoid mixing with milk or calcium-rich foods because they reduce absorption. Use water or vitamin C–rich juice (orange, strawberry) to enhance uptake, then brush teeth to prevent staining.

Reticulocyte counts usually rise within 5–7 days, hemoglobin increases over 2–4 weeks, and ferritin stores may take 2–3 months to replenish—continue therapy as prescribed even after symptoms resolve.

Constipation is common. Encourage fiber, fluids, and regular physical activity. If stools become very hard or painful, speak with your clinician about stool softeners or adjusting the iron formulation.

Give the next dose with a small snack rich in vitamin C (fruit puree, orange juice) to improve tolerance while still avoiding dairy. If vomiting persists or the child cannot keep fluids down, call your clinician for alternatives.

If you realize within a few hours, give it then. Otherwise skip and resume the usual schedule—do not double up. Track doses on a chart so twice-daily regimens stay consistent.

Seek help for severe abdominal pain, signs of overdose (vomiting, lethargy, bloody diarrhea), or if a sibling/child swallows multiple tablets. Contact Poison Control (1-800-222-1222) immediately and bring the bottle to the ER.

Sources reviewed for Elemental Iron

  • aap-iron-2017

  • who-iron-2016

  • kdigo-anemia-2022

  • ccf-peds-iron-2019

  • statpearls-rls-2024

  • Diagnosis and Prevention of Iron Deficiency and Iron-Deficiency Anemia in Infants and Young Children

    American Academy of Pediatrics

    Source