How to say "magnitude" in Japanese

• マグニチュードCommon
  nounThe earthquake sense: the size of a quake on the magnitude scale. This loanword is essentially the seismological term, the one used in news reports about earthquakes.
  マグニチュード５の地震じしんが東京とうきょうを見舞みまった。↗

  An earthquake of magnitude 5 shook Tokyo.
• 等級とうきゅうJLPT N1approx.Common
  nounThe astronomy sense: the magnitude of a star, its brightness on the stellar scale. Beyond astronomy the word means rank or grade, so it is seldom what you want for 'magnitude' in other senses.

Use 「マグニチュード」 for the size of earthquakes on the magnitude scale, and 等級 for the brightness of stars in astronomy; 等級 otherwise means rank or grade, so it rarely renders 'magnitude' outside that field.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• マグニチュードmagnitude
• 等級とうきゅうmagnitude
• Ｍエムmagnitude