▸ processconvert
Power and Energy

JtoMJ

Convert joules (J) to megajoules (MJ).

Factor1 J = 1e-6 MJ

Converter

J

Accepts numbers or expressions, e.g. 150 + 14.7

Result
1MJ

Rendered to 6 significant figures.

Formula

Formula
MJ = J × 1e-6

Multiply any value in joules by 1e-6 to obtain the value in megajoules.

Worked example

Convert 1.00000e+6 J to MJ.

  1. 01Start with 1.00000e+6 J.
  2. 02Multiply by the conversion factor: 1.00000e+6 × 1e-6 = 1 MJ.
Result1.00000e+6 J = 1 MJ

Conversion table

JMJ
11e-6
22e-6
55e-6
101e-5
202e-5
505e-5
1000.0001
2000.0002
5000.0005
10000.001

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from J to MJ?
1 J equals 1e-6 MJ. To convert, multiply the value in joules by 1e-6.
How do I convert 1 J to MJ?
1 J = 1e-6 MJ. For any value, multiply by 1e-6.
How do I convert MJ back to J?
Divide by the same factor — or equivalently, multiply by 1000000. So 1 MJ = 1.00000e+6 J.
When would I need to convert joule to megajoule?
Energy conversions are needed when reconciling fuel/electrical billing, calculating thermal duties, and aligning calorimetry or HHV/LHV figures across data sources.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

Related conversions