Clinical Calculators - GasConsult.ai

Ideal Body Weight (IBW)

Devine formula for anesthesia dosing

Sex

Height

inches

Actual Weight (optional, for ABW)

kg

Ideal Body Weight

--kg

Reference: ClinCalc IBW

Body Surface Area (BSA)

Mosteller, DuBois & Haycock formulas

Height

cm

Weight

kg

Mosteller ⭐

--m²

DuBois

--m²

Haycock (Pediatric)

--m²

Reference: BSA Formulas

Maximum Allowable Blood Loss

Estimated blood volume & transfusion threshold

Patient Type

Weight

kg

Starting Hematocrit

%

Target Hematocrit

%

Max Allowable Blood Loss

--mL

Estimated Blood Volume: -- mL

Reference: MDCalc MABL

QTc Interval (Bazett)

Corrected QT interval for cardiac risk

QT Interval

ms

Heart Rate

bpm

Sex (for interpretation)

QTc (Bazett)

--ms

Enter values above

Reference: Bazett Formula

Maintenance Fluids (4-2-1 Rule)

Holliday-Segar method for pediatrics

Weight

kg

Maintenance Rate

--mL/hr

Daily volume: -- mL/day

Reference: 4-2-1 Rule

PONV Risk (Apfel Score)

Postoperative nausea & vomiting prediction

Female Non-smoker History of PONV or motion sickness Postoperative opioids planned

PONV Risk

--%

Score: 0 / 4 risk factors

Reference: Apfel Score

RCRI (Revised Cardiac Risk Index)

Perioperative cardiac event prediction

High-risk surgery (vascular, intraperitoneal, intrathoracic) History of ischemic heart disease History of congestive heart failure History of cerebrovascular disease Diabetes on insulin therapy Preoperative creatinine > 2.0 mg/dL

Cardiac Event Risk

--%

Score: 0 / 6 risk factors

Reference: RCRI Validation

ASA Physical Status

Classification of patient health status

ASA I Healthy patient, no systemic disease

ASA II Mild systemic disease, no functional limitations

ASA III Severe systemic disease with functional limitations

ASA IV Severe disease that is constant threat to life

ASA V Moribund, not expected to survive without operation

ASA VI Brain-dead patient for organ donation

Reference: ASA Guidelines

Opioid Conversion Calculator

Convert to morphine milligram equivalents (MME)

Opioid

Dose

mg (or mcg/hr for fentanyl patch)

Morphine Milligram Equivalent (MME)

--mg

Use caution with opioid conversions - consider patient factors and start at lower doses.

Reference: CDC MME Conversion

Local Anesthetic Max Dose

Maximum safe dosing to prevent LAST

Local Anesthetic

Patient Weight

kg

Maximum Dose

--mg

--

Reference: NYSORA Guidelines