12 × 12 inch sheet at 300 DPI is 3600 × 3600 pixels

12 × 12 inch sheet (12 × 12 in) at 300 DPI is 3600 × 3600 pixels, which is 13 megapixels.

Portrait3600 × 3600 pixels
Landscape3600 × 3600 pixels
With 0.125 in bleed3675 × 3675 pixels
Megapixels13
Aspect ratio1:1
File size37 MB as uncompressed 8-bit RGB; a JPEG or PNG is smaller
Paper size12 × 12 in (304.8 × 304.8 mm)

The working

Pixels are inches multiplied by the resolution.

Bleed is extra image past the trim line, so that a cut that lands slightly off still leaves ink to the edge. Print shops usually ask for 0.125 in on every side of a US size, which makes the file 3675 × 3675 pixels.

Is your photo big enough?

To fill 12 × 12 inch sheet at 300 DPI an image needs at least 3600 × 3600 pixels. Cropped to fill the sheet:

At 300 DPI the pixels of a print blend together from about 11.5 inches (29 cm) away. 300 DPI is the standard for print that is held in the hand: books, magazines, photo prints, business cards and flyers. At reading distance the eye can no longer pick out the pixels.

12 × 12 inch sheet at other resolutions

ResolutionPixelsWith bleedMegapixelsUncompressed
72 DPI864 × 864882 × 8820.752.1 MB
96 DPI1152 × 11521176 × 11761.33.8 MB
100 DPI1200 × 12001225 × 12251.44.1 MB
150 DPI1800 × 18001838 × 18383.29.3 MB
200 DPI2400 × 24002450 × 24505.816 MB
240 DPI2880 × 28802940 × 29408.324 MB
300 DPI3600 × 36003675 × 36751337 MB
400 DPI4800 × 48004900 × 49002366 MB
600 DPI7200 × 72007350 × 735052148 MB
1200 DPI14400 × 1440014700 × 14700207593 MB

Other sizes at 300 DPI

12 × 12 inches is the standard scrapbook page and the size of the cutting mat on most craft cutters. See 12 × 12 inch sheet in pixels at every resolution or everything at 300 DPI.