Authoritative definitions of the International System of Units and SI prefixes.
Unit converters
Screen resolution
Enter your values below for a clear, instant result.
Screen resolution & pixel densityInstant result
Pixel density
Pixels per centimetre64.24 ppcm
Aspect ratio16:9
Total resolution8.29 MP
Pixel pitch0.1557 mm
FormulaPPI = √(horizontal² + vertical²) ÷ diagonal inches
A 3840 × 2160 image on a 27-inch diagonal display is approximately 163.18 ppi.
Understand the result before using it
Screen resolution relates pixel density units and, in the screen calculator, estimates density from pixel dimensions and diagonal size. The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 1 ÷ 2.54
Assumptions
- The source and target selections represent the same physical quantity or supported notation.
- The entered value is valid for the selected relationship and uses the source unit shown.
- Published unit definitions and conventional conversion factors apply under their stated conditions.
Worked example
96 ppi is approximately 37.795 pixels per centimetre.
When to use it
Good uses
- Translate a screen resolution value found in a document, specification, recipe, or measurement.
- Compare values reported in different unit systems.
- Check a manual conversion and control the displayed precision.
Limitations
Common mistakes to avoid
- PPI describes pixels in an image or display; printer DPI can describe physical dots and is not always interchangeable.
- Do not add meaningful digits beyond the precision of the original measurement.
- Confirm regulated, safety-critical, laboratory, and contractual values against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
What does the Screen resolution converter do?
Screen resolution relates pixel density units and, in the screen calculator, estimates density from pixel dimensions and diagonal size. It does not change the physical quantity represented by the input.
What formula does the Screen resolution converter use?
result = input × 1 ÷ 2.54
Why can a Screen resolution converter result be rounded?
UnitMora calculates with JavaScript double-precision numbers, then formats the result using your selected decimal or significant-figure setting. The unrounded value may contain more digits than are displayed.
What is the most common screen resolution conversion mistake?
PPI describes pixels in an image or display; printer DPI can describe physical dots and is not always interchangeable.
Clear answers, without the guesswork
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