PX / PT / DP converter

Round to the third decimal place.
"mm" is the print size, not the size on the display.

PT (Point)

ptpxmm

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

DP (Density-independent pixel)

dppxmm

	dpi	px	dp	mm
ldpi	120	-	-	-
mdpi	160	-	-	-
tvdpi	213	-	-	-
hdpi	240	-	-	-
xhdpi	320	-	-	-
xxhdpi	480	-	-	-
xxxhdpi	640	-	-	-
dpi		0	0	0

2020-01-22

How to conversion

pt (Point)

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

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

pt (point) is a unit of size mainly used in publications and is defined as “1 pt = 1/72 inch”.

dp (Density-independent pixel)

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

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

dp (density-independent pixel / dip) is a unit of size mainly used in android. 1 dp is defined as approximately equal to 1px at mdpi (160 dpi). So 1dp = 1px at mdpi and 1 dp = 2 px at xhdpi (320 dpi).

mm (Millimetre)

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

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

It is defined as 1 inch = 25.4 mm.

In the display, the physical size changes depending on the resolution, so it cannot be expressed in mm.