How to say "calculus" in Japanese

• 結石けっせきCommon
  nounA stony mass that forms in the body; this is the medical sense of 'calculus'. A common word, and the natural choice when the English refers to such a stone.
• 微分積分学びぶんせきぶんがく
  nounThe branch of mathematics: differential and integral calculus. Use this when 'calculus' names the school or university subject, not a stone or a formula.
• 歯石しせき
  nounDental calculus — the hard deposit, also called tartar, that forms on the teeth. This is the word when 'calculus' is used in a dental sense.
  歯石しせきがたまっているようです。↗

  I think I have a lot of tartar.
• 計算式けいさんしき
  nounReally 'formula' or 'equation' — an expression or method of calculation. It matches 'calculus' only in that calculating sense, and is seldom the word you want for the mathematics or a stone in the body.

Use 結石 for a stone formed in the body, 歯石 for dental tartar, 微分積分学 for the branch of mathematics, and 計算式 only when 'calculus' means a formula or method of calculation.

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

• 結石けっせきcalculus
• 微分積分学びぶんせきぶんがくcalculus
• 歯石しせきtartar
• 計算式けいさんしきformula
• 微積分びせきぶんinfinitesimal calculus
• 微積分学びせきぶんがくinfinitesimal calculus
• 石いしstone (in the bladder, kidney etc.)