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アスペクト比計算

アスペクト比を計算

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このツールとページ内の説明は、現在は英語のみです。動作は同じで、すべてブラウザ内で実行されます。

Find the aspect ratio

16:9

Size for a ratio

1280 × 720 pixels

Common sizes for this ratio

    • 何も端末から出ません
    • サーバーによるサイズ制限なし
    • 登録不要・透かしなし
    • 無料

    How to use it

    1. Enter a width and height (or read them from an image) to see the ratio.
    2. Or pick a ratio and enter one side to get the other.
    3. Click a common size to copy it.

    Common ratios

    RatioUsed for
    16:9HD and 4K video, YouTube, screens
    9:16Phone video: Reels, TikTok, Shorts, Stories
    4:3Older screens, iPad, many photos
    3:2Camera photos, prints
    1:1Square posts and profile pictures
    4:5Portrait Instagram posts
    21:9Ultrawide monitors and cinema

    Good to know

    • Sizes are rounded to whole pixels; "even numbers" rounds to multiples of 2, which video encoders need.
    • A size like 2560 × 1080 is shown as 64:27 and "known as 21:9", because marketing names round the real ratio.

    Calculated in your browser

    The calculations run in your browser as you type. Nothing you enter is sent anywhere.

    よくある質問

    What is the aspect ratio of 1920 × 1080?

    16:9.

    What height does a 1080 px wide 4:5 image need?

    1350 pixels.