Question: 5 megapixels equals how many pixels?
Answer: For example, a 5 megapixel camera may have 2592 x 1944 pixels and a sensor size of 7.18 x 5.32 mm. Divide one dimension by the number of pixels in that dimension, e.g. 7.18 / 2592 = 0.0028 mm/pixel = 2.8 microns/pixel (a micron is one millionth of a meter or a micrometer).