Pixel Ruler Rule your Android and iOS design.

Recommended minimum sizes

You have to follow some simple recommendations for minimal sizes of your UI elements, to provide easy to use user interface.

Minimal size of clickable areas

Recommended minimum size of touchable elements (as buttons, checkboxes, switches, drag & drop items ...) is 48 dp in both dimensions. Curious why this magical number? There is simple explanation. This size in dp is translated approximately to 9mm in physical size, which seamlessly fits in widely recommended range 7-10mm for touchable elements. 

Minimal font size on Android

Minimal readable font size is 12 sp, but it is highly recommended to use at least 14 sp for your main texts. In guidelines 12 sp text is noticed as micro and is suitable only for insignificant supplementary texts. 
Measuring pixels in Android browser
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