Pixel Calculator
From pixel width, height and DPI the calculator derives the print size in cm and inches, the megapixels and aspect ratio, plus a list of common resolutions.
Result
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Common resolutions
HD: 1280 × 720
Full HD: 1920 × 1080
2K: 2560 × 1440
4K UHD: 3840 × 2160
Instagram: 1080 × 1080
A4 (300 DPI): 2480 × 3508
Note: These calculations are for informational purposes only and do not replace professional tax or financial advice. All information without guarantee.
FAQ
Frequently Asked Questions
What is the relationship between pixels and physical size?
The physical size of a pixel depends on the screen resolution and display size. PPI (pixels per inch) defines the density. A 1920x1080 display at 24 inches has about 92 PPI.
What resolution do I need for printing?
For high-quality prints, 300 DPI (dots per inch) is standard. A 10x15 cm photo at 300 DPI needs about 1,181 x 1,772 pixels. For posters viewed from distance, 150 DPI may suffice.
How does the calculator determine the aspect ratio?
It divides width and height by their greatest common divisor: 1920 × 1080 pixels give 16:9, 6000 × 4000 pixels give 3:2. If a resolution does not exactly match a standard format, the exact but unfamiliar reduced ratio appears instead – 1366 × 768 is shown as 683:384, because 1366 / 768 = 1.779 differs slightly from 16/9 = 1.778. In practice such an image is still a 16:9 format.
Guide
What is the Pixel Calculator?
The pixel calculator converts between pixels, centimetres, inches and points at various screen resolutions.
How does the Pixel Calculator work?
Enter the size in pixels (or cm/inches) and the resolution (DPI/PPI). The calculator computes the physical size. Useful for print preparation, web design and image editing.
Key Data and Facts
Standard screen resolution: 72-96 PPI. Print quality: 300 DPI. Conversion: pixels = cm * DPI / 2.54. 1 inch = 2.54 cm = 72 points (pt).
Step-by-Step Guide
How to use the pixel calculator step by step: 1. Choose the input value – pixels, centimetres, inches or points (pt). 2. Specify the resolution – for screen display typically 72-96 PPI (pixels per inch), for printing 300 DPI or higher. 3. Enter the value and read off the result. The core formula is: pixels = (cm / 2.54) * DPI. Conversely: cm = (pixels / DPI) * 2.54. 4. Application, print preparation: A photo of 3,000 x 2,000 pixels at 300 DPI produces a print of 25.4 x 16.9 cm. 5. Application, web design: At 96 PPI, 1,920 pixels correspond to a screen width of about 50.8 cm (20 inches). 6. Note Retina displays: Apple devices use 2x or 3x pixel density. An image measuring 100 x 100 CSS pixels should be exported as 200 x 200 or 300 x 300 pixels. Tip: For sharp printing use at least 300 DPI; for posters, 150 DPI is often sufficient.
Calculation Example
Image 1,200 x 800 pixels at 300 DPI: print size = (1200/300)*2.54 x (800/300)*2.54 = 10.16 x 6.77 cm.
Sources
Official sources
Calculations are based on applicable German laws and official data:
Full methodology at Methodology.
Reviewed by Konstantin Iakovlev · Last updated:
Mathematics
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