Image Resolution (Megapixel) Calculator
Calculate megapixels, aspect ratio, pixel pitch, and horizontal angle of view for any camera sensor and lens combination.
Results
What is it?
Megapixels determine print resolution potential; pixel pitch determines per-pixel light-gathering (low-light performance). A 24 MP APS-C sensor has smaller, noisier pixels than a 12 MP full-frame sensor because the same light is shared across smaller sites.
How to use
Enter your camera output resolution in pixels, the physical sensor width from the spec sheet, and the focal length. The calculator returns megapixels, aspect ratio, pixel pitch (um), and horizontal field of view in degrees.
Example scenario
A 24 MP full-frame camera (6000x4000 px, 35.9 mm sensor): 24 MP, 5.98 um pixel pitch, 63.4 deg FOV at 50 mm. A 24 MP APS-C (6000x4000 px, 23.5 mm sensor): same megapixels, 3.92 um pitch -- smaller pixels with more noise in dark scenes.
Pro tip
Crop factor: APS-C approx 1.5x, Micro 4/3 approx 2x relative to full frame. Multiply focal length by crop factor to get full-frame equivalent FOV. Pixel pitch above 5 um is generally considered excellent for low-light photography. Beyond approx 36 MP, diffraction limits sharpness at apertures narrower than f/5.6.