PXからREMへの変換とは？ <strong>PX</strong>から<strong>REM</strong>への変換はWeb開発でよくあるタスクです。Convert pixel values to REM units based on configurable root font size. 変換の仕組み ピクセル値をルートフォントサイズで割ります。 Common PX to REM Conversions 12px = 0.75rem — small/caption text 14px = 0.875rem — body text (compact) 16px = 1rem — default body text 20px = 1.25rem — subheadings 24px = 1.5rem — h3 headings 32px = 2rem — h2 headings Why Use This Converter? Instant results — paste a value and get the converted output immediately. Copy-ready CSS — one-click copy with properly formatted syntax. Shareable URLs — pre-fill values via URL for easy team sharing. No installation — works in any browser, on any device.