仕組みと動作原理
AVERAGE関数はExcel業務を効率化する代表的な関数です。指定した範囲内の数値の算術平均（アベレージ）を計算します。 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。
💡 わかりやすい要約
Calculates the average (arithmetic mean) of a group of numbers.
"Think of this like sharing cookies equally. If you pool all cookies together and divide them equally, you get the average cookies per person."
構文.
標準Excel表記法=AVERAGE(数値1, [数値2], ...)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 first number, cell reference, or range you want to average.
指定例:B2:B6Additional numbers or ranges to average.
具体的な計算例
ステップ別の実務シナリオCalculate Average Class Score
Calculate the average score of students in a test in column B.
| Student | Test Score | Grade | Class Average | |
|---|---|---|---|---|
| Anna | 85 | B | — | — |
| Ben | 92 | A | — | — |
| Charlie | 78 | C | — | — |
=AVERAGE(B2:B6)Evaluates AVERAGE over the sample table cells, placing the verified output in cell D2.
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。
=AVERAGE()出力される値の特性
Returns number 75 based on sample evaluation criteria and active cell references.
実務上のベストプラクティス
- Empty cells or cells with text are completely ignored by AVERAGE when computing the mean.
- Cells with a value of 0 ARE included in the average.
よくあるミスと注意点
- If your range contains error values, AVERAGE will return the error. Be careful when text representations of numbers are used, as they are ignored.
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 AVERAGE 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: =AVERAGE(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 AVERAGE?↓
If your range contains error values, AVERAGE will return the error. Be careful when text representations of numbers are used, as they are ignored.
Does AVERAGE work identically in Google Sheets?↓
Yes, AVERAGE is supported in both Microsoft Excel and Google Sheets with standard evaluation behavior.