Typography / CSS Unit Converter — CSS has many length units. Absolute units (px, pt, pc, in, cm, mm) are tied to physical measurements. Relative units (em, rem, %) are tied to font size or the root font size. The browser default font size is 16px; this converter assumes that base.
Conversions run locally in your browser. No values are sent anywhere.
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Typography / CSS Unit Converterとは？
CSS has many length units. Absolute units (px, pt, pc, in, cm, mm) are tied to physical measurements. Relative units (em, rem, %) are tied to font size or the root font size. The browser default font size is 16px; this converter assumes that base.
Note: the em and rem conversions depend on the font-size context. If a CSS rule sets a different base font size, the em values change accordingly.
使い方
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Enter a value
Type the length in any supported unit. The default is 1 px.
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Pick the units
The from/to dropdowns cover all the CSS length units: px, pt, pc, in, cm, mm, em, rem, %.
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Mind the base
em assumes 16px base (browser default). rem also assumes 16px root. If your CSS uses a different base, multiply the em/rem result accordingly.
使用例
12pt to px
12pt (a common body-text size) is exactly 16px in CSS.
12 pt
結果： = 16 px (at 96 DPI / 1px = 0.75pt)
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Last reviewed: 2026-09-25