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Energy Conversion Table

Complete energy conversion reference with 15+ units

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Quick Reference Energy Conversion Table

Common energy conversions at a glance

FromJoule
(J)
Kilojoule
(kJ)
Megajoule
(MJ)
Gigajoule
(GJ)
Watt-hour
(Wh)
Kilowatt-hour
(kWh)
Megawatt-hour
(MWh)
Calorie
(cal)
1 Joule
(J)
1.000.0011.00e-61.00e-90.0002782.78e-72.78e-100.239006
1 Kilojoule
(kJ)
1,0001.000.0011.00e-60.2777780.0002782.78e-7239.0057
1 Megajoule
(MJ)
1,000,0001,0001.000.001277.77780.2777780.000278239,005.74
1 Gigajoule
(GJ)
1,000,000,0001,000,0001,0001.00277,777.78277.77780.277778239,005,736.14
1 Watt-hour
(Wh)
3,6003.60.00363.60e-61.000.0011.00e-6860.4207
1 Kilowatt-hour
(kWh)
3,600,0003,6003.60.00361,0001.000.001860,420.65
1 Megawatt-hour
(MWh)
3,600,000,0003,600,0003,6003.61,000,0001,0001.00860,420,650.1
1 Calorie
(cal)
4.1840.0041844.18e-64.18e-90.0011621.16e-61.16e-91.00

All Energy Units

How to Use This Conversion Table

  1. Find your starting unit in the left column (e.g., "1 Joule")
  2. Read across to find the equivalent in your target unit
  3. Multiply the table value by your actual measurement
  4. Example: To convert 5 joules, multiply the table value by 5

💡 Pro Tip:

For precise calculations or values not in this table, use our interactive energy calculator for instant, accurate conversions.