What is the default DPI?

96 DPI, the standard for screens. Change it to 72 or 300 for print work.

How are em and rem calculated?

em and rem are px divided by the base font size (16px by default). Change the base to match your design.

Yes, it's a free developer and designer tool with instant results.

Convert pixels (px) to cm, mm, inches, points (pt), em and rem instantly. The developer & designer unit converter — free and accurate.

Pixels (px)DPI (print)Base font (px)

Centimeters (cm)0.4233cm

Millimeters (mm)4.2333mm

Inches (in)0.1667in

Points (pt)12pt

Picas (pc)1pc

em1em

rem1rem

Percent (%)100%

Type a value in px, and set DPI and base font size if you need to.

Instantly get cm, mm, inches, points, picas, em, rem and percent.

Use the exact value for your CSS, design or print project.

Enter your pixel value and the converter shows the cm equivalent based on your chosen DPI (96 by default).