At the default root font size of 16px, 42px is exactly 2.625rem.
Calculation based on a root font-size of 16 pixels.
How to convert 42px to rem
To convert pixels to rem, divide the pixel value by the root font size: rem = px ÷ 16. For 42px that is 42 ÷ 16 = 2.625rem.
42px is a large size, common for headings, section padding and generous layout gaps.
42px at different root font sizes
| Root font size | Input | Result |
|---|---|---|
| 10px | 42px | 4.2rem |
| 12px | 42px | 3.5rem |
| 14px | 42px | 3rem |
| 15px | 42px | 2.8rem |
| 16px | 42px | 2.625rem |
| 18px | 42px | 2.3333rem |
| 20px | 42px | 2.1rem |
| 22px | 42px | 1.9091rem |
| 24px | 42px | 1.75rem |
CSS examples
font-size: 2.625rem; /* 42px */
padding: 2.625rem;
margin-bottom: 2.625rem;
width: 2.625rem;The same values in pixels, if you need a fixed size:
font-size: 42px;
padding: 42px;Tailwind CSS equivalent
2.625rem is not part of the default Tailwind scale, but you can use an arbitrary value such as p-[2.625rem] or text-[2.625rem].
Nearby values
Frequently Asked Questions
42px equals 2.625rem when the root font size is the browser default of 16px. The calculation is 42 ÷ 16 = 2.625.
2.625rem equals 42px at a 16px root font size (2.625 × 16 = 42).
Yes. If the root font size is 18px, 42px equals 2.3333rem, and at 20px it equals 2.1rem. 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.