Approximately 2% of a screen 480 pixels high and 1% of a screen 1080 pixels high. The figures are the same for both vertical space and pixels since doubling th

Approximately 2% of a screen 480 pixels high and 1% of a screen 1080 pixels high. The figures are the same for both vertical space and pixels since doubling the width doubles both the number of wasted pixels and total number of pixels.