Joules to Kilocalories Converter

Convert Energy from Joules to Kilocalories with Precision

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Joules to Kilocalories Calculator

Convert energy values from Joules (J) to Kilocalories (kcal) with high precision.

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Exercise Energy Calculator

Calculate energy expenditure during exercise in both Joules and Kilocalories.

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Understanding Energy Units

The Joule (J)

SI unit characteristics:

  • Base unit of energy
  • 1 J = 1 kg⋅m²/s²
  • Force × distance unit
  • Work and energy measure
  • Heat energy standard

Exercise Energy

Energy expenditure:

  • Walking: ~280 kJ/hour/kg
  • Running: ~800 kJ/hour/kg
  • Cycling: ~400 kJ/hour/kg
  • Swimming: ~500 kJ/hour/kg
  • Varies with intensity

Practical Applications

Used in:

  • Sports science
  • Exercise physiology
  • Weight management
  • Athletic training
  • Metabolic studies

Energy Systems

Human metabolism:

  • ATP-PC system
  • Glycolytic system
  • Aerobic system
  • Energy substrate use
  • Recovery processes

Essential Energy Conversion Formulas

Basic Conversions

1 kcal = 4.184 kJ

1 kJ = 0.239 kcal

Exercise Energy

E = MET × weight × time

MET = Metabolic Equivalent Task

Power Output

P(watts) = E(joules) / t(seconds)

1 watt = 1 joule/second