Pixelcalculator - convert DPI / PPI to pixels and mm, cm, inches

mm cm in

dpi ppi

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Templates A0 - 841x1189 mm A1 - 594x841 mm A2 - 420x594 mm A3 - 297x420 mm A4 - 210x297 mm A5 - 148x210 mm A6 - 105x148 mm A7 - 74x105 mm 2R - 2.5x3.5 in 3R - 3.5x5 in 4R - 4x6 in 6R - 6x8 in 5R - 5x7 in 8R - 8x10 in S8R - 8x12 in 10R - 10x12 in APS - 16.7x30.2 mm 35mm(135) - 24x36 mm roll - 6x4.5 cm roll - 6x6 cm roll - 6x7 cm roll - 6x8 cm roll - 6x9 cm sheet-film - 9x12 cm sheet-film - 10x12 cm sheet-film - 13x18 cm sheet-film - 18x24 cm

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Result

Pixel total	Pixel [ Mpx]
Picture size
dpi / ppi
Color depth	1 Bit - Monochrome 4 Bit - EGA graphics cards 6 Bit - Amiga computer 8 Bit - MSX2 computer 12 Bit - NeXT workstations 15 Bit - Real Color 16 Bit - High color 24 Bit - True color 30 Bit - PAL, HDR video 36 Bit - HDR10 +, Dolby Vision 42 Bit - Flat screen TV 48 Bit - Flatbed scanner
Disk space	MB
Pitch	μm
Pixel size	μm²

sponsored by: Dia Foto Film Scannen www.archivscan.ch 

Formulas for converting DPI - PPI, mm - cm - inches and pixels

Calculation of length or width, pixels and DPI with the following specifications:

With these formulas you can convert the length, pixels and DPI / PPI:

Examples: print resolution, scan resolution and image size in practice

I want to print a picture for the photo album, 13 x 18 cm, with good quality. How big does the resolution have to be in pixels?

A good quality picture for a photo album is printed at 300 dpi. To calculate the resolution in megapixels, multiply the number of pixels of length and width and divide them by mega (1 million).

I have an image with 3264 x 2448 pixels and would like to print it as a poster. How big can I print the poster?

In contrast to a small picture in the photo album, the poster does not have to have a high pixel density, as this is viewed from a greater distance and the pixels become smaller for the eye. Approx. 100 dpi is recommended for a poster.

I would like to scan slides and present them with a slide show on the television. Screen TV 40 inches; Resolution: 1,920 x 1,080 pixels. How big does the scan resolution have to be?

The dimensions of a slide are 36 x 24 mm, so the aspect ratio does not match that of the television (television = 16: 9 slide = 3: 2). We only calculate the pixel density of the height of the image, as this is the limiting measure.

I would like to print a poster of 900 x 600 mm with the maximum resolution from a slide. How good will the quality be in "dpi"?

The maximum resolution of the scanner is 4000dpi, a slide has the dimensions of 36 x 24 mm. After you have calculated the number of pixels, you can use the dimensions of the poster to calculate the pixel density.

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