At the default root font size of 16px, 1.125rem is exactly 18px.
Calculation based on a root font-size of 16 pixels.
How to convert 1.125rem to px
To convert rem to pixels, multiply the rem value by the root font size: px = rem × 16. For 1.125rem that is 1.125 × 16 = 18px.
18px is a medium size, common for body text, subheadings, buttons and standard spacing. It is often used for comfortable, slightly larger body text.
1.125rem at different root font sizes
| Root font size | Input | Result |
|---|---|---|
| 10px | 1.125rem | 11.25px |
| 12px | 1.125rem | 13.5px |
| 14px | 1.125rem | 15.75px |
| 15px | 1.125rem | 16.875px |
| 16px | 1.125rem | 18px |
| 18px | 1.125rem | 20.25px |
| 20px | 1.125rem | 22.5px |
| 22px | 1.125rem | 24.75px |
| 24px | 1.125rem | 27px |
CSS examples
font-size: 1.125rem; /* 18px */
padding: 1.125rem;
margin-bottom: 1.125rem;
width: 1.125rem;The same values in pixels, if you need a fixed size:
font-size: 18px;
padding: 18px;Tailwind CSS equivalent
As a font size, 1.125rem is the default text-lg class.
Nearby values
Frequently Asked Questions
1.125rem equals 18px when the root font size is the browser default of 16px. The calculation is 1.125 × 16 = 18.
18px equals 1.125rem at a 16px root font size (18 ÷ 16 = 1.125).
Yes. rem is relative to the root font size, so 1.125rem becomes 20.25px at an 18px root and 22.5px at a 20px root. 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.