Magnitude - 1

Magnitude - 2

A magnitude 6.4 earthquake is 5.01 times bigger than a magnitude 5.7 earthquake.

A magnitude 6.4 earthquake is 11.22 times stronger than a magnitude 5.7 earthquake.

Two earthquake magnitudes can compare in two aspects. One of them is earthquake shaking and the other one is energy release. But to compare two earthquake magnitudes is not easy as subtracting two magnitudes. Because, an earthquake magnitude scale is not linear. It is logarithmic. 0.1 difference in two earthquake magnitudes means one earthquake is 1.58 times bigger than other one. For example; a magnitude 7 of an earthquake is 10 times bigger than a magnitude 6 of an earthquake. But, it is 100 times bigger than a magnitude 5 of an earthquake. To compare two earthquake, you need to type their magnitudes in the textboxs above. This online tool automatically calculates the questions of "How much bigger is one earthquake than another earthquake" and "How much stronger (energy release) is one earthquake than another earthquake".

To get further information, you can read below articles.

https://www.science.org/content/article/comparing-earthquakes-explained

https://earthquake.usgs.gov/education/how_much_bigger.php