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Cold Exposure Calorie Burn Calculator

Enter your body weight, the temperature, and how long you were exposed to estimate cold-induced calorie burn.

How it is calculated

The tool uses a simple linear model. Resting baseline is taken as about 1 kcal per kg per hour. A multiplier then scales it by how far the temperature is below 33 °C: multiplier = 1 + 0.15 × max(0, 33 − T). Then baseline = weight (kg) ÷ 60 × minutes, total = baseline × multiplier and extra = total − baseline. At 33 °C or warmer the multiplier is 1.00 and the extra burn is 0. Temperature must be between −5 and 35 °C, and weight and duration must be positive, otherwise there is no result. The same formula is used for water and air, so treat it as a rough estimate only.

Worked example

A 70 kg person spends 15 minutes in 10 °C water. The gap to 33 °C is 23 degrees, so the multiplier is 1 + 0.15 × 23 = 4.45x. Baseline burn is 70 ÷ 60 × 15 = 17.5 kcal. Total burn is 17.5 × 4.45 = 77.9 kcal, shown as 78 kcal. The extra burn is 77.9 − 17.5 = 60.4 kcal, shown as 60 kcal. That is the main result: roughly 60 kcal on top of resting energy use.

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Common mistakes

  • Entering the temperature in Fahrenheit. The field is in °C, and 50 would be rejected as out of range, while 41 would be read as a hot 41 °C and rejected too.
  • Entering the duration in hours or seconds. It is minutes, so a one-hour dip is 60, not 1.
  • Reading the total as what the cold alone burned. The total includes the resting baseline you would burn anyway; the extra figure is the part due to cold.
  • Expecting air and water at the same temperature to cost the same. Water removes heat much faster, but this model uses one formula for both, so air exposure is overestimated.
  • Expecting a result for water above 33 °C. The extra burn is zero from 33 °C upward, and temperatures above 35 °C give no result.

About this calculator

Cold exposure calorie burn estimates the extra energy your body spends generating heat when exposed to cold water or cold air — a process driven mainly by shivering thermogenesis (rapid muscle contractions that produce heat) and, over repeated exposure, non-shivering thermogenesis via activation of brown adipose tissue (BAT), a metabolically active fat type that burns calories to produce heat rather than storing energy. The colder the temperature and the longer the exposure, the more your body has to work to maintain core temperature, which increases the calorie cost.

Practitioners of cold exposure — cold plunges, ice baths, and cold-water swimming, popularized in part by research on BAT activation and interest from figures like Wim Hof — use an estimate like this to understand the metabolic side of a practice more often discussed for its effects on inflammation, mood, and recovery, though the calorie burn from a single session is generally modest compared to structured exercise and shouldn't be relied on as a primary weight-management strategy.

Body weight, the water or air temperature and how long you stay in are used to estimate the extra calories your body burns making heat during that session.

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Comments (1)

  • Editorial team

    The model is linear in time, which gives an easy check: halve the minutes and the extra burn halves too. It has no term for body fat, clothing or shivering, so two adults of the same weight get the same answer. Use it to compare conditions, such as 15 and 20 °C, not to measure yourself. If you compare it with a wearable's estimate, tell us how far apart the numbers were.

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