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[Excel] Everyone is worried about this error.

2024/10/9 Edited to

... Read more#DIV/0!(DIV/0)って、ざっくり言うと「0で割ってしまった/割る相手が空欄で計算できない」時に出るエラーです。たとえば「顧客単価=売上÷顧客数」で、顧客数が0や未入力だと一発で出ます。私は月次の集計でこれが混ざると、見た目も悪いし平均(平均:3,603 みたいな集計)にも影響して困りました。 よく使う解決策は2つあります。 1) IFERRORで「0」や「空白」に置き換える 例:=IFERROR(H3/I3,0) エラー時に0を出したいならこの形。表の「顧客単価」を必ず数値で揃えたい時に便利です。表示を消したい(データがないときは表示しない)なら、0の代わりに""(空白)にします。 例:=IFERROR(H3/I3,"") これで#DIV/0!を表示しない見た目にできます。 2) そもそも割り算する前に条件分岐する 「0のときだけ回避したい」ならこちらも定番です。 例:=IF(I3=0,"",H3/I3) IFERRORは便利ですが、#VALUE!(VALUEエラー)や#N/A(NA)など“何のエラーでも”まとめて処理してしまいます。原因を分けて見たい時は、先にIFで0判定する方が安心でした。 ついでにハマりがちなエラーもメモしておきます。 - #VALUE!:文字列が混ざっていて計算できない時。数値に変換が必要(コピペしたデータで起きがち)。 - #N/A:参照先が見つからない時。VLOOKUP/XLOOKUPの未一致で出やすい。 私のおすすめは、「集計表で見せる列」はIFERRORで空白にして見た目を整え、「検算用の列」はエラーを残して原因追跡できるようにする運用です。用途で使い分けると、同じエラーでも一気にストレスが減りました。

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