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Neonatal Dose Calculator

Work out neonatal dose instantly with clear inputs, formula shown and shareable results.

About Neonatal Dose Calculator

Calculates a weight-based neonatal dose and suggests the interval band that matches corrected gestational age, since renal clearance matures with gestation.

Formula

Neonatal interval bands

Dose = weight x mg/kg. Interval commonly 24 h below 30 weeks corrected gestation, 18 h at 30-34 weeks and 12 h at 35 weeks or more

Worked example

With the default values below, Neonatal Dose Calculator returns Dose per administration of 16.000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Birth weightaccepts 0.4–6 kg
3.2 kg
Dose per kilogramaccepts 0.01–100 mg/kg
5 mg/kg
Corrected gestational ageaccepts 23–46 weeks
38 weeks

Results

Dose per administration
16.000 mg
Interval by corrected gestation
Every 12 hours
Daily dose
32.000 mg
Volume at 10 mg/mL
1.600 mL

Step by step

  1. 1Values used
  2. 2Neonatal interval bands
  3. 3Dose per administration= 16.000 mg
  4. 4Interval by corrected gestation= Every 12 hours
  5. 5Daily dose= 32.000 mg
  6. 6Volume at 10 mg/mL= 1.600 mL

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Why does gestation change the interval?

Glomerular filtration is very low in extreme prematurity and rises steeply with corrected gestational age.

Is dosing weight the birth weight?

Current weight is used once significant weight change has occurred; local guidelines specify which applies.

Related Calculators

Neonatal Dose Calculator – Calculate Dose per administration