CalKit

PX/REM Converter

Convert between px, rem, em, pt.

px
픽셀 (px) 기준값
16.00px

모든 단위 변환

px16.00 px
rem1.0000 rem
em1.0000 em
pt12.00 pt

일반적인 크기 참고

본문 텍스트16px = 1rem
h132px = 2rem
h224px = 1.5rem
small14.0px = 0.875rem

Overview

Convert between units used in digital design and print, including px, rem, em, and pt. Useful for accurate size conversion in web/app development and print design.

Formula

Conversion formulas: px to pt: pt = px × 72 / 96 (= px × 0.75, at 96 dpi). pt to px: px = pt × 96 / 72 (= pt × 1.333). px to rem: rem = px / base font size (16px). rem to px: px = rem × base font size. px to em: em = px / parent font size. px to inches: in = px / DPI. px to cm: cm = px / DPI × 2.54. Note: 1 inch = 72pt = 96px (screen standard).

How to Use

  1. 1Select the source unit and target unit.
  2. 2Set the base font size (for rem/em conversions).
  3. 3Enter the value.
  4. 4Review and copy the conversion result.

Tips

  • ✔In web standards, 1px is not a physical pixel but a CSS reference pixel (approximately 0.26mm at 96 dpi).
  • ✔In print, pt (point) is the standard unit, and body text typically uses 10–12pt.
  • ✔On Retina/high-resolution displays, 1 CSS px maps to multiple physical pixels (device pixel ratio).
  • ✔Be aware of unit differences between design tools (Figma, Sketch) and CSS.

FAQ

Q. What is the difference between px and pt?

px (pixel) is a screen-based unit using 96 dpi as the CSS standard. pt (point) is a print-based unit where 1pt = 1/72 inch. On screen, 1px ≈ 0.75pt. For print design, using pt is more accurate.

Q. What is device pixel ratio (DPR)?

DPR is the number of physical pixels corresponding to 1 CSS pixel. Standard displays have DPR=1, while Retina displays have DPR=2 (or 3). If images look blurry on high-resolution displays, you need to provide images that are DPR times larger.

Q. How should I set the resolution for print design?

Print typically uses 300 dpi (dots per inch). Since 1 inch = 300 dots, a 4×6 inch print requires a 1200×1800 pixel image. Web images at 72–96 dpi will appear low-quality when printed.

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