Kilojoule (kJ) Converter Calculator

Convert kilojoules to calories, BTU, and other energy units

Calories (cal)
238.85
British Thermal Units (BTU)
0.95
Joules (J)
1000
Watt Hours (Wh)
0.28
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Understanding Kilojoules (kJ)

A kilojoule (kJ) is the metric unit of energy measurement, commonly used in scientific calculations and food energy content labeling in many countries. One kilojoule equals 1,000 joules, which represents the energy transferred when applying a force of one newton through a distance of one meter.

Common Uses of Kilojoules

  • Food energy content measurement
  • Scientific calculations
  • Exercise and physical activity energy expenditure
  • Industrial energy calculations

Quick Conversion Guide

  • 1 kJ = 0.239 kilocalories (food calories)
  • 1 kJ = 0.948 BTU
  • 1 kJ = 1,000 joules
  • 1 kJ = 0.278 watt-hours