長方形面積計算機

計算する 計算中…

リセット 印刷

共有リンク

はじめに

Rectangle Area Calculator — Area and perimeter of a rectangle from length and width. Enter Length, Width to get an instant, accurate result.

計算式

Area = length × width. Perimeter = 2 × (length + width).

ステップごとの説明

1. Enter the Length.
2. Enter the Width.
3. Click Calculate to see your result instantly.

実例

Example: With Length = 10, Width = 5, the Rectangle Area Calculator gives Area: 50, Perimeter: 30.

よくある質問

Does this work for a square?

Yes — enter the same value for length and width.

What units should I use?

Any unit works as long as length and width use the same one; the result will be in that unit squared.

What inputs does the Rectangle Area Calculator need?

You'll need to provide: Length, Width. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.

How accurate is the Rectangle Area Calculator?

The Rectangle Area Calculator applies the formula exactly as calculated — Area = length × width. Perimeter = 2 × (length + width). — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.

Is the Rectangle Area Calculator free to use?

Yes, the Rectangle Area Calculator is completely free, requires no signup, and runs instantly in your browser.

長方形面積計算機について

The Rectangle Area Calculator uses a real, verifiable formula — Area = length × width. Perimeter = 2 × (length + width). — so results are accurate every time, not an approximation.