Quick converter
Type into any field — every unit in this category updates instantly.
Root font-size 16px
Common px → em values
Click any row to open its dedicated page.
| px | em |
|---|---|
| 4px | 0.25em |
| 6px | 0.375em |
| 8px | 0.5em |
| 10px | 0.625em |
| 12px | 0.75em |
| 14px | 0.875em |
| 16px | 1em |
| 18px | 1.125em |
| 20px | 1.25em |
| 24px | 1.5em |
| 28px | 1.75em |
| 32px | 2em |
| 36px | 2.25em |
| 40px | 2.5em |
| 44px | 2.75em |
| 48px | 3em |
| 56px | 3.5em |
| 64px | 4em |
| 72px | 4.5em |
| 80px | 5em |
| 96px | 6em |
| 112px | 7em |
| 128px | 8em |
| 144px | 9em |
| 160px | 10em |
| 192px | 12em |
| 224px | 14em |
| 256px | 16em |
Convert 128px to other units
Formula
rem = px ÷ root-font-size and px = rem × root-font-size. Browsers default the root font-size to 16px, so 1rem normally equals 16px unless the page (or the user's browser settings) changes it.
em works the same way, but relative to the parent element's font-size rather than the root — the numbers only match rem when nothing in the ancestor chain has resized the font.
pt is a print unit: 1pt = 1.333px, based on the fixed 96px-per-inch / 72pt-per-inch relationship browsers use.
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