Pixel to CM
Turn a pixel count into centimetres at the pixel density you print or display at: 1,000 px at 300 PPI is 8.47 cm, shown with mm, inches and px per cm.
Photography
17 tools
Tools in this category
CM to Pixel
Turn centimetres into pixels for a chosen resolution: 10 cm at 300 PPI is 1181 px. Shows exact value, inches and pixels per centimetre.
Image Resolution Calculator
Turn pixel dimensions and PPI into megapixels, print size in inches and centimetres, and aspect ratio. 3000 × 2400 px at 300 PPI prints 10 × 8 in.
DPI to PPI Converter
Convert a DPI or dots-per-cm value to pixels per inch and see the print size your pixels give: 3000 × 2400 px at 300 DPI prints at 10 × 8 inches.
Print Size Calculator
Turn an image's pixel width and height plus a print resolution into print size in inches and centimetres; 6000 × 4000 px at 300 ppi prints 20 × 13.33 in.
PPI Calculator
Find a display's pixels per inch from its resolution and diagonal size. A 24-inch 1920 × 1080 monitor works out to 91.79 PPI and 0.2767 mm dot pitch.
DPI Calculator
Work out the DPI of an image printed at a given width, or the largest print size at a chosen DPI. 3000 px across 10 in gives 300 DPI.
Exposure Triangle Calculator
Find the shutter time, aperture or ISO that keeps the same exposure after you change one setting, with EV at ISO 100 and the stop shift per setting.
Shutter Speed Calculator
Find the shutter speed that keeps your exposure when you change aperture or ISO. Shows exact seconds, the nearest 1/3-stop setting and the stop change.
Exposure Calculator
Turn an f-number, shutter speed and ISO into an exposure value referenced to ISO 100, with the light level those settings match. f/16 at 1/125 s is EV 15.
Reciprocity Calculator
Corrects metered long exposures for film reciprocity failure using Ilford's Tc = Tm^P formula, with exponents for HP5, FP4, Delta and Kentmere stocks.
ND Filter Calculator
Convert a metered shutter speed into the long exposure you need behind an ND filter, from ND2 to 20 stops, with exposure factor and optical density.
Circle of Confusion
Find the circle of confusion for any camera sensor from its diagonal, using the d/1500, Zeiss d/1730 or d/3000 criterion. Full frame gives 0.029 mm.
Dynamic Range Calculator
Turn full-well capacity and read noise into sensor dynamic range in stops and dB, compare several cameras, and check the headroom against a scene in EV.
4:3 Calculator
Find the missing side of a 4:3 frame from its width, height or diagonal. A 1024-pixel width gives 768 pixels of height; a 20-inch screen is 16 × 12.
1:1 Calculator
Find the largest 1:1 square crop of a photo from its pixel width and height, with the centred offset, megapixels kept and share of the frame lost.
16:9 Calculator
Find the missing side of a 16:9 frame from its width, height or diagonal. 1920 px wide gives 1080 px tall; a 55-inch screen is 47.94 × 26.96 in.