At the default root font size of 16px, 10px is exactly 0.625rem.
Calculation based on a root font-size of 16 pixels.
How to convert 10px to rem
To convert pixels to rem, divide the pixel value by the root font size: rem = px ÷ 16. For 10px that is 10 ÷ 16 = 0.625rem.
10px is a small size, common for captions, labels, small text and tight spacing. It is often used for very small captions, often too small for comfortable body text.
10px at different root font sizes
| Root font size | Input | Result |
|---|---|---|
| 10px | 10px | 1rem |
| 12px | 10px | 0.8333rem |
| 14px | 10px | 0.7143rem |
| 15px | 10px | 0.6667rem |
| 16px | 10px | 0.625rem |
| 18px | 10px | 0.5556rem |
| 20px | 10px | 0.5rem |
| 22px | 10px | 0.4545rem |
| 24px | 10px | 0.4167rem |
CSS examples
font-size: 0.625rem; /* 10px */
padding: 0.625rem;
margin-bottom: 0.625rem;
width: 0.625rem;The same values in pixels, if you need a fixed size:
font-size: 10px;
padding: 10px;Tailwind CSS equivalent
The default spacing scale has a step for 0.625rem: use classes like p-2.5, m-2.5, gap-2.5, w-2.5 and h-2.5.
Nearby values
Frequently Asked Questions
10px equals 0.625rem when the root font size is the browser default of 16px. The calculation is 10 ÷ 16 = 0.625.
0.625rem equals 10px at a 16px root font size (0.625 × 16 = 10).
Yes. If the root font size is 18px, 10px equals 0.5556rem, and at 20px it equals 0.5rem. The pixel value itself never changes, only the rem equivalent. Use the base font size field above to try any value.
Prefer rem for font sizes, spacing and layout so they respect the user's browser font settings and scale for accessibility. Use px for details that should never scale, such as 1px borders or fixed icon sizes.