CSS Unit Converter

px、rem、em、%、pt、vwの変換。
PX
16px
.
REM
1rem
.
EM
1em
.
%
100%
.
PT
12pt
.
VW
0.8333vw
.

6 Units

px, rem, em, %, pt, vw.

Custom Base

Set base font size and viewport width.

Copy Result

One-click copy to clipboard.

Client-side

All processing in your browser. No data uploaded.

CSS Unit Converterについて

CSS Unit Converter helps front-end developers and designers translate measurements between the six most common CSS length units: px (pixels), rem (root em), em (local em), % (percent), pt (points), and vw (viewport width). Getting unit conversions right is critical for responsive layouts — a spacing value that looks perfect at a 1440px viewport can break completely at 375px if the units are not chosen carefully. rem and em are preferred for typography because they scale with the user's browser font size preference, improving accessibility; vw adapts to viewport width for fluid layouts; and px remains useful for borders and fine details that should not scale. Enter any value, pick its unit, and see all six equivalents computed simultaneously. You can also customise the base font size (default 16px) and viewport width for accurate context-specific conversions.

CSS Unit Converterの使い方

  1. Type the numeric value you want to convert into the left input field.
  2. Select the source unit from the dropdown (px, rem, em, %, pt, or vw).
  3. If needed, update the "Base font" field — this affects rem, em, and % calculations. The default is 16px.
  4. If needed, update the "Viewport" field — this affects vw calculations. The default is 1920px.
  5. All six unit equivalents update instantly in the grid below.
  6. Click any result card to copy that value (with its unit suffix) to the clipboard.

よくある質問

What is the difference between rem and em?

rem (root em) is always relative to the root element's font size (typically 16px). em is relative to the font size of the element itself, which can cascade and compound in nested elements.

Why does % conversion depend on the base font size?

In the context of font sizes, percentage values are relative to the parent element's font size. This tool uses the base font size as a stand-in for the parent, giving a useful approximation.

How many pixels is 1 point (pt)?

1pt = 96/72 ≈ 1.333px at standard screen resolution. Points are a print measurement unit and rarely used in modern CSS.

What viewport width should I enter?

Use the target device width for your design. Common values: 375px (iPhone SE), 768px (tablet), 1440px (desktop), 1920px (wide desktop).

Can I convert multiple values at once?

Currently the tool converts one value at a time. For batch conversions, use your browser's DevTools console with a custom script.

CSS Unit Converterの完全ガイド：無料オンラインツール

ブラウザ完結で安全・高速なCSS Unit Converter。開発者やクリエイターの作業を効率化

px、rem、em、%、pt、vwの変換。を瞬時に実現する無料ツールです。面倒なソフトのインストールは不要で、安全にブラウザ上で処理できます。

CSS Unit Converterが選ばれる理由

  • 高速処理: ミリ秒単位で即時実行。
  • プライバシー保護: データは端末外に送信されません。
  • 完全無料: 登録不要で制限なく利用可能。

簡単な3つの利用手順

  1. CSS Unit Converterのページを開きます。
  2. データを入力または貼り付けます。
  3. 結果を確認してコピーまたは保存します。

機能比較

項目 Metoolzy CSS Unit Converter 他社オンラインツール 専用ソフト
料金 完全無料 制限あり 有料ライセンス
セキュリティ 完全ローカル処理 サーバー送信あり ローカル処理

主な活用シーン

  • エンジニアの開発・デバッグ効率化
  • Web制作者の日常作業
  • データ変換・最適化

よくある質問 (FAQ)

入力したデータは保存されますか？

いいえ、すべてブラウザ内で処理され保存されません。