Enter weight, height, age, and medicine strength below. See single-dose, daily totals, and volume instantly. Use built-in checks to avoid dosing mistakes every time.
This chart summarizes the calculated dose, daily total, and estimated volume per dose.
Many pediatric references express dosing as mg/kg because drug exposure often correlates with body mass. When weight changes rapidly, recalculating each visit reduces error. This calculator multiplies the selected mg/kg by weight in kilograms to produce a single-dose amount, then projects a daily total using doses per day.
Some therapies, including several oncology and specialty protocols, use mg/m2 because surface area can better reflect metabolic capacity in certain settings. The Mosteller method estimates BSA as the square root of (height in cm times weight in kg divided by 3600). The dose is then mg/m2 times BSA, which can be useful when dosing guidance is written in BSA terms.
Liquid formulations often require an mL instruction. The calculator converts mg to mL by dividing the final single dose by the product strength in mg/mL. For example, a 180 mg dose with a 25 mg/mL suspension yields 7.2 mL. Always confirm the concentration on the specific label you have, and use an appropriate oral syringe for accuracy.
Clark’s, Young’s, and Fried’s rules estimate a child dose as a fraction of an adult dose using weight in pounds, age in years, or age in months. These are screening tools, not prescribing standards. They can highlight whether an order is far outside an expected range, but they do not replace protocol-based dosing, renal adjustments, or indication-specific guidance.
Many medicines define a maximum single dose and a maximum daily dose. If you enter a max single dose, this tool caps the calculated single dose and reports that a cap was applied. If the computed daily total exceeds the max daily value, the calculator flags a warning so you can reassess the plan and re-check frequency.
Clear documentation supports safer handoffs. CSV export captures each input and computed field for quick review, while the PDF summary provides a printable record of the method, concentration, and totals. Use exports to double-check arithmetic, confirm units, and communicate calculations during team review, especially when multiple clinicians verify the same order independently.
You need weight, doses per day, and concentration. Add mg/kg for weight-based, height plus mg/m2 for BSA, or an adult dose for rule-based estimates.
If you enter a max single dose, the tool caps the single dose and notes it. Max daily dose is not forced; it triggers a warning so you can reassess.
Use the method specified by your dosing reference. Many common medicines use mg/kg, while some specialty protocols use mg/m2. Do not switch methods without guidance.
Volume equals the final single dose in mg divided by the medicine concentration in mg/mL. Verify the label strength, especially when multiple strengths exist.
They are rough screening estimates based on adult dose fractions. They can help detect outliers, but they are not a substitute for protocol dosing, adjustments, or clinical judgment.
Yes. CSV is easy to import into spreadsheets for audits, and PDF is useful for printing. Treat exports as calculation notes, not medication orders.
| Scenario | Weight (kg) | Height (cm) | Method | Input dose | Freq/day | Concentration | Output (single mg) | Output (mL) |
|---|---|---|---|---|---|---|---|---|
| Otitis media, oral suspension | 18 | 110 | mg/kg | 10 mg/kg | 3 | 25 mg/mL | 180 mg | 7.20 mL |
| Oncology protocol, infusion dose | 28 | 128 | mg/m2 | 250 mg/m2 | 1 | 10 mg/mL | ≈ 220 mg | ≈ 22.0 mL |
| Rule estimate, quick screening | 22 | 120 | Clark’s rule | Adult 500 mg | 2 | 50 mg/mL | ≈ 161 mg | ≈ 3.22 mL |
Values are illustrative only and should not be used as prescriptions.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.