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ICU CLINICAL NUTRITION · ESPEN 2023 · ASPEN/SCCM 2016 · INDIA ICU GUIDELINE

ICU Energy
Requirement
Calculator.

Four-method hierarchy: Indirect Calorimetry → VCO₂-derived → Weight-based → Harris-Benedict legacy. Phase-adjusted delivery targets, protein prescription, and full clinical care plan for critically ill adults.

ESPEN 2023 Revised ASPEN/SCCM 2016 India ICU 2018 Harris-Benedict 1918 Weir 1949
4Calculation methods
ICGold standard
3ICU phases
2.5g/kg CRRT max
Indirect Calorimetry Preferred
Phase-Adjusted Delivery Targets
Protein + CRRT Override
Refeeding Risk Screening
Adults Only · ICU Use
Adult ICU Use Only. This tool is for registered dietitians, intensivists, and trained critical care clinicians. It does not apply to paediatric, obstetric, or general ward patients. Energy estimates must be integrated with ICU day, haemodynamic status, route tolerance, non-nutritional calories (propofol, citrate, dextrose), and refeeding risk before prescribing. Indirect calorimetry is the preferred method: predictive equation outputs are estimates only.

Patient Parameters

Step 1 of 4: Demographics & Anthropometrics

01 Patient Demographics & Anthropometrics
Day 1 = admission day
Use for BMI calculation
ESPEN: use for BMI ≤30
Auto selects per ESPEN 2019 rules
02 Calculation Method Select highest available in hierarchy
03 Clinical Context & Risk Modifiers
04 EN Safety Checklist ESPEN 2019 exclusion criteria

Check any that apply. Presence of these conditions may contraindicate early enteral nutrition:

Complete all required fields

ESPEN 2023 · ASPEN/SCCM 2016 · India ICU 2018 · Harris-Benedict 1918 · Long 1979 · Weir 1949

LIVE PREVIEW
—
kcal/day (full EE)
—
kcal/day delivery target
Protein —
Weight basis —
ICU phase —
Method —
Confidence —

MEASUREMENT HIERARCHY

1st
Indirect CalorimetryGold standard. Measures VO₂ + VCO₂
2nd
VCO₂-derived (ventilator)EE = VCO₂ × 8.19 (Weir)
3rd
Weight-based ICU estimate20–25 (ESPEN) or 25–30 (ASPEN)
4th
Harris-Benedict legacyBEE × activity × stress factor

ICU DIETITIAN

Critical Care
Nutrition Consult

Our ICU-trained dietitians provide bedside indirect calorimetry, phase-adjusted feeding plans, refeeding management, and daily review for critically ill patients.

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PHASE-BASED TARGETS

D1–3
Early Acute<70% estimated EE: hypocaloric (ESPEN 2023)
D3–7
Late Acute80–100% measured EE when clinically appropriate
D7+
ConvalescentAdvance toward full requirements, optimise protein

EN EXCLUSION FLAGS

Uncontrolled shock
Active upper GI bleed
Bowel ischaemia
Bowel obstruction
Abdominal compartment syndrome
Gastric aspirate >500 mL/6h
High-output fistula

⚕️ Clinical Disclaimer: This ICU Energy Requirement Calculator is designed for use by registered dietitians, intensivists, and trained critical care clinicians in adult ICU settings only. It is not validated for paediatric, pregnant, or general ward patients. All energy estimates carry inherent inaccuracy: indirect calorimetry remains the gold standard (ESPEN 2023). Calculated estimates must be integrated with clinical status, ICU day, haemodynamic stability, feeding route tolerance, non-nutritional calorie sources (propofol, citrate, IV dextrose), refeeding risk, and individual patient response. Albumin and prealbumin are not reliable nutritional status markers in the ICU. The clinician holds final prescriptive responsibility. Reassess nutrition targets daily in the first week of ICU admission. Harris-Benedict × stress factor outputs are labelled legacy estimates and should not be treated as equivalent to measured energy expenditure. ESPEN 2023 · ASPEN/SCCM 2016 · India ICU Guideline 2018 · Harris-Benedict 1918 · Long 1979 · Weir 1949.

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