仕組みと動作原理
FLOOR関数はExcel業務を効率化する代表的な関数です。Rounds a number down to the nearest multiple of significance. 複雑な集計や参照処理を簡素化し、データ分析の精度と生産性を飛躍的に高めます。
構文.
標準Excel表記法=FLOOR(number, significance)引数一覧.
この関数で指定できるすべての引数について詳しく解説します。
The number to round down.
指定例:A2The multiple to round down to.
指定例:1具体的な計算例
ステップ別の実務シナリオDiscounts - Round Down to 10s
Round prices down to the nearest multiple of 10.
| Raw Price | Discount Floor |
|---|---|
| 28.75 | — |
| 44.50 | — |
=FLOOR(A2, 10)Evaluates FLOOR over the sample table cells, placing the verified output in cell B2.
数式ジェネレーター
ウィザードを開く引数を入力するだけで、シートにそのまま貼り付けて使える数式を作成できます。
=FLOOR()出力される値の特性
Returns number 20 based on sample evaluation criteria and active cell references.
実務上のベストプラクティス
- Round billing times down to the nearest 15-minute or 30-minute block.
よくあるミスと注意点
- If the significance is zero, FLOOR returns #DIV/0!.
各プラットフォーム対応表
実際のExcelおよびGoogleスプレッドシートの計算エンジン仕様に基づいた検証結果です。
Core standard function supported across all modern and legacy Microsoft Excel versions (365, 2021, 2019, 2016, 2013, 2010), as well as Excel for the Web and Mac.
100% compatible with Google Sheets. Uses identical argument order, data types, and standard calculation logic.
よくある質問と回答
技術解説Can I use FLOOR across different worksheets in Excel?↓
Yes. You can reference cells located on other sheets by including the sheet name followed by an exclamation mark, for example: =FLOOR(Sheet2!A2:A10). If the sheet name contains spaces, enclose it in single quotes: ='Q1 Report'!A2:A10.
What is the most common reason for errors in FLOOR?↓
If the significance is zero, FLOOR returns #DIV/0!.
Does FLOOR work identically in Google Sheets?↓
Yes, FLOOR is supported in both Microsoft Excel and Google Sheets with standard evaluation behavior.