This website was designed for the personal use of the author alone and CANNOT be guaranteed to be free from errors both factual or technical and should be used with caution and all calculations checked.

While it may be more intuitive and it has a best effort to enusre it is error free I recommend alternative tools such as nicutools.org, peditools.org and starship.org.nz are recommended instead of this tool

Welcome to NicuHacks

Welcome to the NicuHacks (the Gregulator is dead, long live the Gregulator)

Greg's NICU calculators

UPDATE 5/9/25: I have removed a few of the calculators and changed them to links to alternative sources as I feel there this website might be used outside what was originally intended. While I am not aware of any issue with the previous calculators I think more established sources are more appropriate. With the exeption of the modified cummings, burette and half correction calculators and alternative source has been provided. Once again I encorage you to use one of the other resources

The Ready Reckonner

The Ready reckoner has been removed and I suggest alternative tools one tool is nicutools.org


For ETT and UV/UA size and depths
For adrenaline dosing

NeoRESQ Retrieval Time Log

Tap store to store the current time or enter it manually in a hh:mm format if needed. The current time will only be entered if the box is blank. Times between notification and the furthest time in the retrieval are used to calculate the retrieval time. Press clear to zero all the values for a new retrieval

>

Team notified

Team ready

Depart NeoRESQ

Transport arrive

Depart RBWH

Take off

Land destination

QAS arrived

Arrive bedside

Ready to leave

Depart referring site

Take-off base

Arrive accepting hospital

Depart Accepting Hospital

Arrive NeoRESQ

Restock and clean completed

Total Retrieval time:

00:00

Temperature and Pressure at Altitude

This calculator will estimate the FiO2 and exterior temperature at altitude. A slightly more accurate calculation of temperature will occur if you enter your location rather than the Brisbane default however this data is sent to a third party. You may choose to enter an alternate city instead.

Altitude (ft)

Current FiO2 (%)

Location (City name)


0

0

0

0

  References

As you increase in altitude the is a reduction in barometric pressue, air density and the partial pressure oxygen meaning less air is available for respiration. While the fraction of oxygen in the air does drop a little the drop in partial pressure is more significant and can cause or worsen hypoxia. There is also a concomittant drop in temperature at increasing altitude. While retrieval fixed wing flights are typically pressurised to 6000ft and the cabins heated, rotary wing flights are not able to pressurise thier cabins although they can be heated. In this calculator the current location is used to gather the temperature and barometric pressure for the formula

1. The baraometric pressure is calculated by the simplified hypsometric formula (https://keisan.casio.com/exec/system/1224579725)

P(altitude) = P(sea-level):(1-((0.0065 x altitude(m)/(temperature(C)+273.15+0.0065 x altitude(m))^5.257

2. The altitude temeprature is calculated as 1.981℃ decrease for each 1000ft of altitude

*requires location access. Information sent to openweathermap.org/ but not stored by NicuHacks
High Frequency Oscillator VG Volume

This calculator gives the suggested VT for the desired weight adjusted DCO2. The weight adjusted DCO2 is the DCO2 divided by the infant weight squared. Generally weight adjusted DCO2 should be from 30-60 with 45 being a good starting point for most infants

Weight (g)

Target Weight adjusted DCO2

Frequency

Volume of VG

Click to calculate

  References

1. VG calculated using the formula:
Vg(mLs)= sqrt( target(DCO2) X weight(kg)^2 / frequency(Hz) )
High Frequency Oscillator Frequency Converter

Use this calculator when changing frequency to keep the relative CO2 clearence similar. If you are changing the frequency due to poor gas exchange use a slightly higher VT than the given value. Using a lower frequency generally requires a higher VT however may require a lower deltaP to achieve the target volume

DCO2

Frequency

Volume of VG

Click to calculate


  References

1. VG calculated using the formula:
Vg(mls) = sqrt( target(DCO2) / new frequency(Hz)
Weight adjusted DCO2

This calculator gives the weight adjusted DCO2 which is a measure of the amount ventilation the patient is recieving in a similar fashion to minute ventilation. It is agnositc of frequency unlike VT values. It is important while improved over the raw DCO2 it has a poor association with PaCO2

Weight (g)

Delivered DCO2


Weight adjusted DCO2

0.00

  References

1. VG calculated using the formula:
Adjusted DCO2 = DCO2/Weight(Kg)^2
HFOV Ti

This calculator gives the Ti when on HFOV for differing I:E ratios

Frequency

I:E Ratio

Inspiration time

ms

  References

1. Ti calculated using the formula:
1000/frequency * (1/(E+1))
Oxygenation Index (OI)

Oxygenation index is important risk stratifier for paediatric patients and ECMO. Generally an OI >30 should consider ECMO referral while >40 should trigger an urgent referral.

FiO2 (%)

Mean Airway Pressure (cmH20)

PaO2 (mmHg)


Oxygenation Index

0

  References

1. OI calculated using the formula: OI = (FiO2 x MAP)/ PaO2
2. Trachsel, D., McCrindle, B. W., Nakagawa, S., & Bohn, D. (2005). Oxygenation index predicts outcome in children with acute hypoxemic respiratory failure. American journal of respiratory and critical care medicine, 172(2), 206–211. https://doi.org/10.1164/rccm.200405-625OC
Low Flow Oxygen Calculator from CPAP/HFNC

The equation by Finer et al has been rearranged to give an equivalent low flow for given FiO2. This equation assumes the peak flow on the blended flow exeeds the peak inspiratory flow such as with HFNC and nCPAP. It can not be used with low flow on a blender

Weight (g)

FiO2

Respiratory Rate

Tidal Volume

Low flow rate

0

  References

p>1. Flow given by the formula:
" " Flow=Wt*((fiO2*(Vt/100)*RR)-(Vt*RR*0.21))/0.79)
2. Data adapeted from Finer NN, Bates R, Tomat P. Low flow oxygen delivery via nasal cannula to neonates. Pediatr Pulmonol. 1996 Jan 1;21(1):48–51.

Low Flow Oxygen Equivalent FiO2 calculator

The calculator estimates the FiO2 for a given low flow amount


Weight (g)

FiO2

Respiratory Rate

Tidal Volume

Equivalent FiO2:   0

  References

1. Flow given by the formula:
" " Flow=Wt*((flow*0.79)+(0.21*RR*Vt*Wt))*100/(RR*Vt*Wt)
2. Data adapeted from Finer NN, Bates R, Tomat P. Low flow oxygen delivery via nasal cannula to neonates. Pediatr Pulmonol. 1996 Jan 1;21(1):48–51.

HFNC PEEP estimator (use with caution)

This calculator uses data derived from two papers and not a single model and should be used with care. If using this calculator to set flow caution not to use a flow >3 L/min/kg. A flow of under 4 L/min does not generate a signficant amount of PEEP due to circuit resistance

Weight

Flow (L/min)

Estimated PEEP

1

  References

The estimate PEEP is given by PEEP = 4 + (0.6*(flow - 4)) - 0.7 x weight (kg)
References
1. Liew Z, Fenton AC, Harigopal S, Gopalakaje S, Brodlie M, O'Brien CJ. Physiological effects of high-flow nasal cannula therapy in preterm infants. Arch Dis Child Fetal Neonatal Ed. 2020;105(1):F87-93.
2. Nielsen KR, Ellington LE, Gray AJ, Stanberry LI, Smith LS, Diblasi RM. Effect of high-flow nasal cannula on expiratory pressure and ventilation in infant, pediatric, and adult models. Respir Care. 2018;63(2):147-57.
3. Sreenan C, Lemke RP, Hudson-Mason A, Osiovich H. High-flow nasal cannulae in the management of apnea of prematurity: A comparison with conventional nasal continuous positive airway pressure. Pediatrics. 2001;107(5):1081-3.

Glucose Additive Calculator

Please see the table (appendix C) in the QCG hypoglycaemia guideline available

HERE
Glucose Infusion Rate Calculator

Please see the Starship calculator available

HERE
Daily Sodium Intake Calculator

Please see the very thorough calculator from starship for

Preterm

and

Term

infants

Adjusted Daily Weight Gain

Generally infants should gain 10-25g/kg/day, typically 15g/kg/day

Last weight

kg

g

Weight gain over (days)


0

Percent Weight Loss

Weight loss >10% generally needs a review of intake and supplementation if needed

Birth weight

g

Current Weight

g


0

PMA calculator

The PMA is calculated using either GA at birth or EDD once selected

Calculate PMA on:

Based on

Method


Gestation at birth

+


0

Useful Links

1. ASID perinatal guidelines: useful resource for most common perinatal infections

2. Drager High Frequency Booklet: Not exactly light reading but very helpful in understanding the mechanics of HFOV

3. NeoMedQ: Statewide drug monographs used within Queensland

4. ANMF: Well written, referenced and extensive guidelines for neonatal medicines

  References

All links are provided, supported and the property of the referral organisation
About NicuHacks

These are a number of calculators I use in the management of critically unwell neonates. Once upon the time known as the Gregulator now NicuHacks with thanks to Sister Hosey

For a few them I have included the rationale behind the calculators where I got the idea or data from. I have tried to make sure it is error free but if not please let me know and I'll fix it however I cannot guaranty that they are. Similarly, I have created these for my own use and I would recommend you use them with a great deal of care.

I learnt how to code this website in a few weeks so if you're a developer please don't laugh. If you're not then you can make one too!

None of the data entered on this website is stored outside your device either (including the print pages), there are no ads and I definitely am not using any page analytics although if you choose to use the altitude correction tool then your location is sent to an external provider

(C) NICUHACKS PTY LTD

This website was designed for the personal use of the creator and accepts no responsibility for its use, misuse or errors