Aspect Ratio Calculator
Resize dimensions while keeping the aspect ratio, with a visual preview
Change any field and the other side will be calculated automatically in proportion.
Instructions
アスペクト比計算機の使い方
機能概要
画像、動画、キャンバスのサイズを変更するとき、比率が崩れるのが一番の心配です。このツールは元の比率を保ったままもう片方のサイズを換算し、簡約した比率も表示します。
使用方法
注意事項
❓ FAQ
Why calculate the ratio before resizing?
Stretching only the width or height distorts the image. Calculating the other side from the ratio keeps the image undistorted, which is exactly what the "keep aspect ratio" button does in image editing software.
What are common 16:9 sizes?
Common ones include 1920×1080, 1280×720, 2560×1440 and 3840×2160. Enter 1920 and 1080 as the original width and height, then set the new width to the value you want.
Which ratio is used for vertical videos?
The common vertical ratio for short videos is 9:16, for example 1080×1920 and 720×1280. Just click the 9:16 button to apply it.
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