PX to REM Converter
DeveloperConvert pixels to rem and rem to pixels with a custom base font size, updated live as you type. Free and fully client-side; nothing is sent or stored.
Pixels → REM
REM → Pixels
What is a PX to REM converter?
A PX to REM converter translates pixel values into rem units and back, using the base font size you set. Because rem units scale relative to the root font size, text and spacing adjust smoothly when a user changes the browser's font settings.
How do rem values relate to pixels?
1 rem equals the base font size: dividing pixels by the base gives rem, and multiplying rem by the base gives pixels. With a base of 16 px, 32 px becomes 2 rem and 1.5 rem becomes 24 px.
Why is 16 px the default base?
Major browsers use a default root font size of 16 px, which is why most projects start there. You can change it because some design systems adopt other bases such as 14 px or 10 px.
Why rem beats px
rem is measured against the root font size, so users who enlarge their browser settings get a website that scales with them. Pixel-fixed text ignores that preference and can push content out of reach for low-vision users.
How the math works
One rem equals the root font size — 16px by default in browsers. A designer value of 24px becomes 1.5rem (24 ÷ 16). The converter does that division for both directions, including decimal results it rounds for practical CSS.
Frequently Asked Questions
What is PX to REM Converter?
Converts pixels to rem and rem to pixels live with a base font size you choose.
How do I use PX to REM Converter?
Type or paste your data into the field on this page and press the button. The result is calculated instantly in your browser — nothing is uploaded.
Is PX to REM Converter free?
Yes, PX to REM Converter is completely free. No signup, no downloads and no usage limits.
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