Font Size Conversion Calculator
The Font Size Conversion Calculator is a free online tool for converting font sizes between pixels (px), root ems (rem), ems (em), and percent (%) values. Set the base font size, enter a font size and unit, and instantly view the equivalent values.
The default base font size is 16px, which is the common default used by web browsers. Change the base size to match your webpage or project, and use the live preview to compare the selected font size with the base font size.
Font Size Preview
Base Size — 16px
The quick brown fox jumps over the lazy dog.
Converted Size — 24px
The quick brown fox jumps over the lazy dog.
Base Font Size
px
Font Size
Converted Values
| PX | 24px | |
| REM | 1.5rem | |
| EM | 1.5em | |
| Percent | 150% |