Earthquake Magnitude Energy Calculator

Translate earthquake magnitude into estimated energy release, TNT equivalent, and energy ratio versus another magnitude.

Last updated: 2026-03-26

Earthquake energy calculator

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Estimate the physical energy release implied by an earthquake magnitude and compare it with another event.

Estimated energy release

Enter an earthquake magnitude to estimate joules released and compare it with a reference event.

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Example calculations

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One-magnitude jump

Magnitude 4.5 compared with 3.5

A one-point change on the magnitude scale looks small, but it implies a very large jump in energy release.

Result: A one-point increase works out to about 31.6 times more energy.

Regional major quake

Magnitude 6.8 versus 5.5

Useful for translating a familiar headline magnitude into the much steeper energy curve underneath it.

Result: A 6.8 event releases roughly 89 times the energy of a 5.5 event.

Great quake scale

Magnitude 8.9 versus 7.0

The highest-magnitude earthquakes are separated from already-destructive magnitude-7 events by thousands of times more energy.

Result: An 8.9 event releases several thousand times more energy than a 7.0 event.

How the earthquake energy estimate works

The calculator uses a standard educational approximation: log10 of energy in joules equals 1.5 times magnitude plus 4.8. That turns the familiar magnitude value into a physical energy estimate.

Once the energy is in joules, it can be converted into TNT equivalent and kilowatt-hours. The comparison field simply divides the two energy estimates, which reveals how steep the magnitude scale really is.

Earthquake energy calculator FAQs

Magnitude is logarithmic, so the interesting question is usually the ratio between two events, not just the difference in their raw magnitude labels.

Why does a small magnitude change create such a large energy jump?

Magnitude is logarithmic. The energy relation uses ten raised to one-and-a-half times the magnitude, so each whole-number step corresponds to about 31.6 times more energy.

Is this the same as the old Richter scale?

For quick educational estimates, calculators like this often use the familiar magnitude framing. Real seismology reporting now leans on moment magnitude, but the energy relation still works as a practical classroom approximation.

Does this tell me how much damage an earthquake will cause?

No. Damage depends on depth, distance, building quality, soil conditions, and local intensity. This tool estimates energy release only, not expected impact at a specific place.

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