PX, PT, DP converter / Tool

This is a tool that converts the size units px, pt, dp/dip, mm, depending on the resolution (dpi).

PT (Point)

	dpi	pt	px	mm
Mac (Non-Retina)	72	1	1	0.35
Windows (scale 100%)	96	1	1.33	0.35
Windows (scale 125%)	120	1	1.67	0.35
Windows (scale 150%) Mac (Retina) iPhone (4/5/SE/6/XR)	144	1	2	0.35
iPhone (X/XS/11)	216	1	3	0.35
		0	0	0

DP (Density-independent pixel)

	dpi	dp	px	mm
ldpi	120	1	0.75	0.16
mdpi	160	1	1	0.16
tvdpi	213	1	1.33	0.16
hdpi	240	1	1.5	0.16
xhdpi	320	1	2	0.16
xxhdpi	480	1	3	0.16
xxxhdpi	640	1	4	0.16
		0	0	0

2020-01-22

How to use this tool

If you enter any unit, it will be converted to other units per dpi.
Round off to the third decimal place.
mm is the size at the time of printing, not the size on the display.

Conversion Formula

pt (Point)

px={\dfrac {pt \times dpi}{72}}

pt={\dfrac {px \times 72}{dpi}}

A pt (point) is a unit of size used primarily in publications and is defined as “1 pt = 1/72 inch”. There are several definitions of pt, but in this paper we refer to the most common DTP point as a pt.

dp (Density-independent pixel)

px={\dfrac {dp \times dpi}{160}}

dp={\dfrac {px \times 160}{dpi}}

A dp (density-independent pixel/dip) is the unit of size used in Android development. since the screens used in Android vary in density, it was created to represent roughly the same size at any density (Some devices have 160 px per square inch, others 480 px per square inch).

1 dp is defined as approximately equal to 1px at mdpi (160 dpi). So at mdpi, 1 dp = 1 px, and at xhdpi (320 dpi), which is twice that, 1 dp = 2 px.

mm (Millimetre)

px={\dfrac {mm \times dpi}{25.4}}

mm={\dfrac {px \times 25.4}{dpi}}

1 inch = 25.4 mm according to the international inch standard.

On a display, the physical size depends on the resolution, so it cannot be expressed in mm.