Design Tools
Font Size Converter — px, rem, em, pt, vw Instantly Free
🔒 Runs in your browser
Convert a font size between px, rem, em, pt, %, and vw all at once. Adjust the base font size (default 16px) and viewport width to match your project's assumptions. All six unit equivalents update instantly. Runs in your browser — nothing is sent to a server.
How to use this tool
- Enter a font size value and select its unit.
- Adjust the base font size and viewport width if needed.
- Copy the equivalent value in whichever unit you need.
| Unit | Value |
|---|---|
| px | 16 |
| rem | 1 |
| em | 1 |
| pt | 12 |
| % | 100 |
| vw | 1.1111 |
16px = 16.00px at base 16px / 1440px viewport
All conversions happen in your browser. em and rem both use the base font size; adjust it to match your root/html font-size.
How to Convert Font Size Units Online — Free (2026)
Convert between px, rem, em, pt, %, and vw instantly. Adjust base font size and viewport width to match your project.