The first thing to figure out is what PX and CM are.
A pixel is a unit of length, and CM is a unit of length. A cm is not going to be many pixels, it’s only going to be many pixels in a cm.
Pixel and centimeter can not be converted, it depends on the resolution, usually resolution is expressed in two ways: one is: pixel per inch; One is: pixels per centimeter.
For example, the resolution of most commonly used pictures for web pages is 72, that is, 72 pixels per inch, 1 inch is equal to 2.54 cm, so through conversion can be obtained per cm is equal to 28 pixels; Another example is a 30×30 cm picture, which is 840 x 840 pixels long.
The following list of commonly used sizes is for reference only.
Width to height ratio: 3:4 4:3 16:9
Screen scaling resolution resolution resolution
Screen size resolution
Common size of new media mobile terminal (Ratio)
Recommended tools frequently used by product managers:
Prototype design tools:
1. axure:www.axure.com.cn/
2. Copy RP: www.mockplus.cn/
Mind mapping:
XMAND: www.xmind.cn/