Free neonatal calculators
Free bedside calculation tools for neonatology, no sign-up required: gestational age by Capurro and New Ballard, corrected age for preterm infants, SGA/AGA/LGA classification, the Apgar, Rodwell and Silverman-Andersen scores, umbilical catheter, endotracheal tube and body surface area. Each calculator includes the formula, the interpretation and the references. The same calculations, together with doses and dilutions for more than 150 drugs, are in the NeoFast app. It also includes eligibility for therapeutic hypothermia in HIE.
Capurro calculator
Estimate the newborn’s gestational age with the somatic or somatic-neurologic Capurro method, with a score for each sign and the result in weeks and days.
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New Ballard Score calculator
Estimate the newborn’s gestational age with the New Ballard Score, with the 12 neuromuscular and physical maturity items and the conversion of the sum to weeks.
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Corrected age calculator
Calculate the corrected age and postmenstrual age of a preterm infant from gestational age at birth and date of birth. Includes the rule for how long to correct.
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SGA, AGA or LGA classification
Classify the newborn as small, appropriate or large for gestational age by birth weight, sex and GA, with the Fenton 2025 cut-offs.
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Apgar score
Calculate the newborn’s Apgar score at 1 and 5 minutes, with the five signs scored 0 to 2 and the interpretation at each time point.
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Rodwell score
Calculate the Rodwell hematologic score from the newborn’s blood count and see the probability of neonatal sepsis, with sensitivity, specificity and criteria.
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Silverman-Andersen score
Calculate the newborn’s Silverman-Andersen score with the five respiratory parameters scored 0 to 2 and the classification of respiratory distress.
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Umbilical catheter calculator
Calculate the insertion depth of the umbilical arterial (UAC) and venous (UVC) catheters by weight or by the newborn’s external measurements, with the Shukla and Wright formulas.
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Endotracheal tube by gestational age
Select the newborn’s endotracheal tube by gestational age: internal diameter, insertion depth at the lip mark, straight blade number and suction catheter size.
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Body surface area calculator
Calculate body surface area in m² with the Mosteller and Haycock formulas, or with the simplified weight-only formula, for newborns and children.
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Therapeutic hypothermia
Check whether a newborn with hypoxic-ischemic encephalopathy meets the therapeutic hypothermia criteria of the AAP 2026 clinical report, block by block.
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