Accuracy at your fingertips
Built by neonatologists,
for everyone who cares for newborns
Make your day-to-day easier.
In use in more than 170 countries.
4.8 · 73 ratings · Free 30-day trial
The app
What NeoFast does
NeoFast is an app for physicians and neonatal teams working in the NICU, the delivery room and the emergency department. It brings together in one place the calculations and look-ups that daily practice calls for: drug preparation and administration, IV fluids, intubation sequence, scores, respiratory monitoring and growth. You enter the patient’s data and the app does the math, shows the warnings and gives the references used in each calculation, so you save time and work more safely on shift.
Available in English, Portuguese and Spanish, for Android and iPhone.
- 160 medicines
- more than90 calculations, scores and guides
- 10 procedures
- 8 areas
Venous hydration
Composition of the IV fluid solution from weight and targets, with the venous access type compatible with the final concentration, and an optional formulation.
Continuous medication
33 medicines
Preparation and infusion rate of continuous-infusion drugs.
Medicines
more than 140 medicines
Antibiotics, antifungals, antivirals and others, with preparation, dilution, infusion time, stability and incompatibilities.
Intubation
3 phases, 11 medicines
Intubation sequence drugs calculated from a single weight.
Other calculations and scores
more than 40 calculations and scores
Gestational age, scores, jaundice, kidney and electrolytes, acid-base and reference values.
Procedures
10 procedures
Neonatal procedure guides, from intraosseous access to pericardiocentesis.
Respiratory and hemodynamic monitoring
23 calculations and 4 guides
Oxygenation, respiratory mechanics and hemodynamics, with mechanical ventilation guides.
Growth and Development
22 tools
Growth charts, corrected age, developmental milestones and craniometry.
Additional information for each drug, search and a recent list, warnings in the result and the reference at the end of each calculation.
See the main references (8)
Each calculation shows in the app the references it used. The main ones are:
- Micromedex NeoFax [Internet]. Ann Arbor (MI): Merative; 2026. Available from: https://www.micromedexsolutions.com
- Taketomo CK, Hodding JH, Kraus DM. Pediatric & neonatal dosage handbook. 30th ed. Hudson (OH): Lexicomp/Wolters Kluwer; 2023.
- Handbook on injectable drugs. 20th ed. Bethesda (MD): American Society of Health-System Pharmacists; 2018.
- The Johns Hopkins Hospital; Fatola T, Heckman J, Silvestri N, editors. The Harriet Lane handbook: a manual for pediatric house officers. 24th ed. Philadelphia (PA): Elsevier; 2027.
- Keszler M, Gautham KS, Goldsmith JP, editors. Goldsmith’s assisted ventilation of the neonate: an evidence-based approach to newborn respiratory care. 7th ed. Philadelphia (PA): Elsevier; 2022.
- WHO Multicentre Growth Reference Study Group. WHO child growth standards: length/height-for-age, weight-for-age, weight-for-length, weight-for-height and body mass index-for-age: methods and development. Geneva: World Health Organization; 2006.
- Fenton TR, Kim JH. A systematic review and meta-analysis to revise the Fenton growth chart for preterm infants. BMC Pediatr. 2013;13:59.
- Kemper AR, Newman TB, Slaughter JL, Maisels MJ, Watchko JF, Downs SM, et al. Clinical practice guideline revision: management of hyperbilirubinemia in the newborn infant 35 or more weeks of gestation. Pediatrics. 2022;150(3):e2022058859.
Beyond these works, each drug entry and each calculation lists its own references, with links to the drug labels where available.
From our Clinical Library
Search results
October 31, 2026
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Free neonatal calculators
Search results
Capurro calculator
Estimate the newborn’s gestational age with the somatic or somatic-neurologic Capurro method.
Silverman-Andersen score
Calculate the newborn’s Silverman-Andersen score with the five respiratory parameters scored 0 to 2 and the classification of respiratory…
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.
Rodwell score
Calculate the Rodwell hematologic score from the newborn’s blood count and see the probability of neonatal sepsis, with sensitivity.
Venous hydration
From weight and targets (GIR, total volume and electrolytes), NeoFast builds the 24-hour solution with the volume of each component, the glucose concentration and the access type.
Example: 2 kg newborn on day 3 of life, maintenance IV fluids without amino acids.
Examples with fictitious patients and illustrative values. NeoFast supports the calculation and does not replace clinical judgment: always check the prescription, the available drug presentation and your unit’s protocol.
Swipe to see the 4 screens
Continuous medication
Enter weight, dose and pump rate; get the drug volume, the diluent and the final concentration, checked against the limit for the chosen access.
Example: 3 kg newborn, dobutamine through peripheral access, pump at 1 mL/h.
Examples with fictitious patients and illustrative values. NeoFast supports the calculation and does not replace clinical judgment: always check the prescription, the available drug presentation and your unit's protocol.
Swipe to see the 5 screens
Medicines
With weight, gestational age and days of life, NeoFast calculates the dose, the interval, the vial reconstitution and the final dilution.
Example: 3 kg newborn, born at 39 weeks, day 3 of life, IV ampicillin, 500 mg vial.
Examples with fictitious patients and illustrative values. NeoFast supports the calculation and does not replace clinical judgment: always check the prescription, the available drug presentation and your unit's protocol.
Swipe to see the 4 screens
Intubation
From a single weight, NeoFast builds the intubation sequence, with the dilution and volume of each drug selected.
Example: 3 kg newborn, premedication for non-emergency intubation with atropine, fentanyl and rocuronium.
Examples with fictitious patients and illustrative values. NeoFast supports the calculation and does not replace clinical judgment: always check the prescription, the available drug presentation and your unit's protocol.
Swipe to see the 4 screens
Other calculations and scores
Reference values by gestational age and patient age, and clinical scores with the criteria described on screen.
Example: reference values for a female preterm newborn of 32 weeks, 5 days of life.
Examples with fictitious patients and illustrative values. NeoFast supports the calculation and does not replace clinical judgment: always check the prescription, the available drug presentation and your unit's protocol.
Swipe to see the 4 screens
Procedures
From gestational age, NeoFast shows the estimated endotracheal tube depth, the diameter, the laryngoscope blade and the suction catheter.
Example: insertion depth and diameter of the tracheal tube in a 30-week newborn.
Examples with fictitious patients and illustrative values. NeoFast supports the calculation and does not replace clinical judgment: always check the prescription, the available drug presentation and your unit's protocol.
Swipe to see the 2 screens
Respiratory and hemodynamic monitoring
Oxygenation, respiratory mechanics and hemodynamic calculations with the formula in view, such as mean airway pressure by both methods.
Example: mean airway pressure (MAP) in a newborn on conventional ventilation.
Examples with fictitious patients and illustrative values. NeoFast supports the calculation and does not replace clinical judgment: always check the prescription, the available drug presentation and your unit's protocol.
Swipe to see the 4 screens
Growth and Development
Birth weight classification on the Fenton chart, corrected age and other growth calculations.
Example: girl born at 32 weeks weighing 1600 g, and her corrected age at 112 days of life.
Examples with fictitious patients and illustrative values. NeoFast supports the calculation and does not replace clinical judgment: always check the prescription, the available drug presentation and your unit's protocol.
Swipe to see the 4 screens
Frequently asked questions
How much does NeoFast cost? Is there a free trial?
The download is free, and full access to the app is through a monthly or yearly subscription purchased on the App Store or Google Play. Your first subscription starts with 30 days free, and you cancel it in the store itself. The calculators and the Clinical Library on this site are free and need no sign-up.
Which devices and languages does NeoFast support?
Android and iPhone, and also iPad, with iOS 15.6 or later. The app is available in English, Portuguese and Spanish, and you can switch the language inside the app.
Does NeoFast work offline?
Yes: once installed and with an active subscription, the calculations and content work without a connection. You need the internet to download, subscribe to and update the app.
Who creates the content, and what references is it based on?
The content is created and reviewed by neonatologists. Each calculation shows in the app the references it used, including Micromedex NeoFax (Merative), Pediatric & Neonatal Dosage Handbook, Handbook on Injectable Drugs and The Harriet Lane Handbook, and the drug entries link to the drug labels where available. The main list is under What NeoFast does.
Does NeoFast replace clinical judgment?
No. NeoFast supports the calculation based on the data entered by the user: always check the prescription, the available drug presentation and your unit's protocol.
NeoFast
Download the app now
Your neonatal shift calculations on your phone, with the reference for every result.
Available in English, Portuguese and Spanish, for Android and iPhone.