Joules to moment magnitude
Type a value in J to get it in Mw instantly.
-2.681Mw
Nothing on our list is smaller: a quake you can feel is 332,543,719× more. That energy could run a home for about 1.543×10⁻¹⁰ years.
Convert the other way: Mw to J
What it means
How much energy is that?
Uses the standard relation log₁₀E = 1.5M + 4.8. Reported magnitudes vary slightly between agencies and methods.
The math
How to convert J to Mw
Magnitude is logarithmic energy: log₁₀E = 1.5M + 4.8, so one whole magnitude is about 32 times the energy.
Example: 6 J = -2.68123 Mw.
Every unit
Your earthquake in every unit
Tables
J to Mw conversion table
| J | Mw |
|---|---|
| 2 J | -2.99931 Mw |
| 3 J | -2.88192 Mw |
| 4 J | -2.79863 Mw |
| 4.5 J | -2.76452 Mw |
| 5 J | -2.73402 Mw |
| 5.5 J | -2.70642 Mw |
| 6 J | -2.68123 Mw |
| 6.5 J | -2.65806 Mw |
| 7 J | -2.6366 Mw |
| 7.5 J | -2.61663 Mw |
| 8 J | -2.59794 Mw |
| 9 J | -2.56384 Mw |
Mw to J conversion table
| Mw | J |
|---|---|
| 2 Mw | 63,095,700 J |
| 3 Mw | 1.995×10⁹ J |
| 4 Mw | 6.31×10¹⁰ J |
| 4.5 Mw | 3.548×10¹¹ J |
| 5 Mw | 1.995×10¹² J |
| 5.5 Mw | 1.122×10¹³ J |
| 6 Mw | 6.31×10¹³ J |
| 6.5 Mw | 3.548×10¹⁴ J |
| 7 Mw | 1.995×10¹⁵ J |
| 7.5 Mw | 1.122×10¹⁶ J |
| 8 Mw | 6.31×10¹⁶ J |
| 9 Mw | 1.995×10¹⁸ J |
Quick answers
Quick answers
- How many Mw is 1 J?
- 1 J is -3.2 Mw.
- How many Mw is 10 J?
- 10 J is -2.53333 Mw.
- How many Mw is 6 J?
- 6 J is -2.68123 Mw.
The units
About these units
Joules (J)
The SI unit of the energy released.
Moment magnitude (Mw)
The modern magnitude scale, based on how much rock moved and how far.
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