10px to rem
10px = 0.625rem
At the browser default root font size of 16 px. Change it and this number changes — see below.
How it is calculated
One px is 0.0625rem, so:
10px × 0.0625 = 0.625remReversing it, 0.625rem × 16 returns 10px.
10px at other root font sizes
rem is measured against the root element, so the answer above holds only while that is 16 px. A visitor who has raised their browser's default — the accessibility setting rem exists to respect — is reading your page at one of the larger rows.
| Root font size | 10px equals |
|---|---|
| 14 px | 0.714286rem |
| 16 px (default) | 0.625rem |
| 18 px | 0.555556rem |
| 20 px | 0.5rem |
| 24 px | 0.416667rem |
Nearby values
| px | rem |
|---|---|
| 8px | 0.5rem |
| 10px | 0.625rem |
| 12px | 0.75rem |
| 14px | 0.875rem |
| 16px | 1rem |
| 18px | 1.125rem |
Frequently asked questions
What is 10px in rem?
0.625rem at the default 16 px root font size.
How is 10px converted to rem?
Multiply by 0.0625: 10 × 0.0625 = 0.625. To go back, multiply 0.625 by 16.
Is 0.625rem always the answer?
No. rem is relative to the root element, so 10px is 0.625rem only while that is 16 px. The table above gives the value at the sizes you are most likely to meet.