ToolForage.
PRINT & MEDIA CALCULATOR

Print Size Calculator

Choose image pixels to find print dimensions, or enter a planned print size to find required pixels. Set the print resolution in pixels per inch.

Calculator

px
px
ppi
Use the required image pixels per inch, not the printer’s device DPI specification.
YOUR RESULTS
Print width20 in
Print height
13.333 in
Print width in centimetres
50.8 cm
Print height in centimetres
33.867 cm
Image pixel count
24 MP
Image width used
6,000 px
Image height used
4,000 px

Same pixels at different print resolutions
Same pixels at different print resolutions
Resolution (ppi)Width (in)Height (in)
1504026.67
2003020
3002013.33
Page guide

Print dimensions at the selected PPI

Width and height describe a print using every entered pixel without cropping. The comparison table shows how the same image size changes at other PPI values; it does not assess sharpness from the image itself.

If the print frame uses a different shape, the Image Aspect Ratio Calculator compares the crop and border dimensions.

The formula

Print width(in) = pixel width ÷ PPI; print height(in) = pixel height ÷ PPI. Centimetres = inches × 2.54.

Pixels per inch describe how densely the image pixels are placed on paper. Doubling PPI halves each physical dimension. The megapixel result is width times height divided by one million, which is a pixel count rather than a file-size estimate.

Worked example

An image measuring 6,000 by 4,000 pixels prints at 20 by 13.333 inches at 300 PPI. That is approximately 50.8 by 33.867 cm. At 150 PPI, the same unchanged pixels occupy 40 by 26.667 inches. At 300 PPI, a planned 8 × 10 inch print requires 2,400 × 3,000 pixels. A 203.2 × 254 mm print gives the same requirement.

How to use this calculator

  1. Choose existing image pixels or the pixels required for a planned print.
  2. Enter both dimensions; planned prints can use inches, centimetres or millimetres.
  3. Set PPI and read the pixel dimensions, physical print size and resolution comparison.

PPI and printer DPI

PPI describes the image data per physical inch. Printer DPI describes a device’s ink or toner dot resolution and is not interchangeable with image PPI. A printer can use multiple dots to reproduce a single image pixel. Use the image-resolution requirement supplied for your particular print job.

Changing size without adding detail

Editing a resolution number while keeping resampling off changes print dimensions but preserves the original pixels. Upsampling can create additional pixels without recovering missing detail. Image focus, compression artifacts, paper, and viewing distance also affect the result, so this arithmetic cannot promise print quality. If the paper has a different aspect ratio, decide whether to crop the image or leave borders before choosing final dimensions.

Planning a print before creating the image

Required-pixels mode multiplies each planned dimension in inches by PPI and rounds upward to a whole pixel. Choose inches, centimetres or millimetres for the planned dimensions. The results show the small increase in actual print size caused by that upward rounding. Both derived pixel dimensions must be at most one million. Modes keep their separate dimensions when you switch back. No file is resized, and extra pixels do not recover missing image detail.

Assumptions & limitations

What this calculation assumes

  • The image uses square pixels and no crop is applied.

What to keep in mind

  • Does not inspect a file, resample pixels, or evaluate visual sharpness.

Common questions

Is 300 PPI always necessary?

No single value suits every output. Print process, viewing distance, and the provider’s requirements determine an appropriate target.

Will changing PPI make the file smaller?

Not by itself when the pixel dimensions remain fixed. File size also depends on format, compression, bit depth, and image content.

Sources & further reading

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