Joules to Calories Converter

Convert Energy from Joules to Calories with Precision

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Joules to Calories Calculator

Convert energy values from Joules (J) to small calories (cal) with high precision.

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Metabolic Rate Calculator

Calculate energy expenditure in both Joules and Calories.

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Understanding Energy Units

The Calorie

Key points:

  • 1 cal = 4.184 J (exactly)
  • Historical unit of heat
  • Defined by water heating
  • Different from food Calorie (kcal)
  • Used in calorimetry

Energy in Nutrition

Important concepts:

  • Food energy in kcal (Cal)
  • 1 kcal = 4.184 kJ
  • Protein: 4 kcal/g
  • Carbs: 4 kcal/g
  • Fats: 9 kcal/g

Applications

Used in:

  • Nutritional science
  • Metabolic studies
  • Food labeling
  • Exercise physiology
  • Calorimetry experiments

Historical Context

Development:

  • Introduced by Nicolas Clément
  • Refined by James Joule
  • Standardized in 1925
  • SI unit transition
  • Modern nutritional use

Essential Energy Conversion Formulas

Basic Conversions

1 cal = 4.184 J

1 J = 0.239 cal

Metabolic Calculations

BMR (men) = 88.362 + (13.397 × weight) + (4.799 × height) - (5.677 × age)

BMR (women) = 447.593 + (9.247 × weight) + (3.098 × height) - (4.330 × age)

Energy Density

Protein/Carbs: 17 kJ/g

Fats: 37 kJ/g