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Calcimator

Hypothermia Treatment Calculator

Classify hypothermia severity from core temperature with rewarming rate, cardiac risk, and intervention recommendations.

Inputs

Results

Hypothermia Stage (1=Mild, 2=Moderate, 3=Severe, 4=Profound)

1

Recommended Rewarming Rate (°C/h)1
Estimated Time to 36 °C (hours)1
Cardiac Risk (0=Low, 1=Mod, 2=High, 3=Critical)0
Intervention (1=Passive, 2=Active Ext, 3=Active Int, 4=ECMO)1
Osborn (J) Wave Likelihood (%)5
How to Use This Calculator
  1. Enter the Core Temperature (degrees C) — measured by esophageal or bladder probe for accuracy.
  2. The calculator automatically assigns Hypothermia Stage based on core temperature.
  3. Review Recommended Rewarming Rate (degrees C/h) — avoid rewarming too rapidly to prevent afterdrop.
  4. Check Cardiac Risk level — severe/profound hypothermia requires continuous cardiac monitoring.
  5. Select Intervention (Passive external, Active external, Active internal, or ECMO) based on stage and cardiac status.

How the result changes with Core Temperature (°C)

Core Temperature (°C)Hypothermia Stage (1=Mild, 2=Moderate, 3=Severe, 4=Profound)
184
243
331
391

What each input means

Core Temperature (°C)
Core body temperature in Celsius (rectal, esophageal, or bladder). Normal ~37 °C.

What each result means

Hypothermia Stage (1=Mild, 2=Moderate, 3=Severe, 4=Profound)
1 = Mild (32-35 °C), 2 = Moderate (28-32 °C), 3 = Severe (24-28 °C), 4 = Profound (<24 °C).
Recommended Rewarming Rate (°C/h)
Target rewarming rate based on severity.
Estimated Time to 36 °C (hours)
Approximate hours to reach normothermia at recommended rate.
Cardiac Risk (0=Low, 1=Mod, 2=High, 3=Critical)
Risk of dysrhythmia: bradycardia, AFib, VF, or asystole.
Intervention (1=Passive, 2=Active Ext, 3=Active Int, 4=ECMO)
1 = Blankets/warm environment, 2 = Bair Hugger/warm IV, 3 = Warm lavage/intravascular, 4 = ECMO/bypass.
Osborn (J) Wave Likelihood (%)
Estimated likelihood of seeing Osborn waves on ECG.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Core Temperature (°C) = 35 = 1 input(s) provided
  2. Calculate Hypothermia Stage
    1 = 1
  3. Calculate Recommended Rewarming Rate
    1 = 1
  4. Calculate Estimated Time to 36 °C
    Estimated Time to 36 °C
    1 = 1

Engine last updated . Checked against 4 independently-derived tests — how we verify calculators.

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