Free tool
Paediatric mg/kg dosing helper
Enter a child's weight and the mg/kg from your own prescribing reference; the tool does the multiplication — per dose and per day — and shows the age-banded reference vitals next to it. It never suggests a drug or a dose.
You supply the mg/kg from your own prescribing reference. This tool does not suggest a drug or a dose.
Dose arithmetic
Enter weight and mg/kg to see the arithmetic.
Reference vitals — adult
no age enteredWidely-published reference ranges (PALS-style), not authoritative cut-offs. A child can be well outside these and fine, or inside and unwell. Source: StatPearls, "Vital Sign Assessment" (NCBI Bookshelf NBK553213). Always interpret with the clinical picture.
Runs entirely in your browser — nothing you enter is sent to a server or stored.
What this tool does — and what it deliberately won't do
Weight-based dosing is simple arithmetic done dozens of times a day, and a slip of a decimal point is the kind of error that hurts a small patient. This tool removes the mental maths: you type the mg/kg you have already chosenand the child's weight, and it returns the total per dose and per day. That is the whole job.
It will not pick a drug, suggest a starting dose, warn about a maximum, or flag an interaction — because doing any of that safely needs the full clinical context the tool does not have. Treat the number it returns as a multiplication you double-check, never as a recommendation. Confirm every dose against a current paediatric reference and your own judgement.
The vitals card shows the same age-banded reference ranges the Avinya Plus EMR shows while you chart a child's vitals — infant, child, and adult bands for heart rate, respiratory rate, and blood pressure. They are general published ranges, not pass/fail thresholds. Clinics running paediatric consultations can see how this works in the platform on our paediatric clinics page.
Frequently asked questions
- Does this tool tell me what dose to give a child?
- No. It never suggests a drug, a dose, a maximum, or a frequency. You supply the mg/kg from your own prescribing reference, and the tool multiplies it by the weight you enter. It is an arithmetic aid, not a prescribing tool — verify every dose independently.
- How is the per-dose amount calculated?
- Per dose equals the mg/kg you typed multiplied by the weight in kilograms you typed, rounded to two decimals. Per day multiplies that single dose by the number of doses per day you select. That is the entire calculation; nothing is inferred about the drug.
- Where do the reference vitals ranges come from?
- They are widely-published paediatric reference ranges (PALS-style), banded by age into infant, child, and adult, drawn from StatPearls' 'Vital Sign Assessment' chapter on the NCBI Bookshelf (NBK553213). They are general guides, not authoritative cut-offs, and must be read alongside the clinical picture.
- Why does an infant share the same blood-pressure band as a child?
- The reference set we mirror gives distinct infant heart-rate and respiratory-rate bands but a single child band for blood pressure, so an infant uses the child BP band here. This matches the source rather than inventing an infant-specific BP cut-off.
- Is this tool a medical device or clinical advice?
- No. It is a calculator that performs arithmetic on numbers you provide and displays published reference ranges. It does not diagnose, recommend treatment, or replace clinical judgement. Always confirm dosing with a current paediatric reference.
Sources
Accessed June 2026. The vitals bands displayed are general published reference ranges consistent with PALS-aligned values. They are not authoritative cut-offs and do not replace clinical judgement. This tool performs arithmetic on values you supply; it does not provide, suggest, or validate any drug dose.
Chart paediatric vitals with the bands already on screen.
The Avinya Plus EMR shows age-aware reference ranges right beside the vitals fields as you record a child's heart rate, breathing, and blood pressure — the same infant, child, and adult bands this tool uses. See it on a real consultation screen.