Digital Image Resolution Converter
Quick answer: Choose a starting unit and a target unit, then enter a value. Common conversions: 1 ppi = 0.3937008 px/cm; 1 ppi = 0.03937008 px/mm; 1 px/cm = 2.54 ppi. This converter covers 6 digital image resolution units.
- Calculator
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- Examples
- Step by step
- Popular conversions
- Reading your result
- Mistakes
- FAQ
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- Method
Use the Digital Image Resolution Converter
Digital Image Resolution formula and what each symbol means
target = value × (factor of starting unit ÷ factor of target unit), where each factor is the unit value in ppi.
| Symbol | Meaning |
|---|---|
| value | The number you want to convert |
| factor | The unit’s size expressed in the base unit (ppi) |
Digital Image Resolution examples
ppi to px/cm
10 ppi = 3.937008 px/cm.
ppi to px/mm
10 ppi = 0.3937008 px/mm.
px/cm to ppi
10 px/cm = 25.4 ppi.
How to calculate Digital Image Resolution step by step
- Choose the starting unit and the target unit.
- Enter your value.
- Read the converted value, plus the conversion factor in both directions.
Popular digital image resolution conversions
- Pixels per inch to Pixels per centimeter converter
- Pixels per inch to Pixels per millimeter converter
- Pixels per centimeter to Pixels per inch converter
- Pixels per centimeter to Pixels per millimeter converter
- Pixels per millimeter to Pixels per inch converter
- Pixels per millimeter to Pixels per centimeter converter
How to read your Digital Image Resolution result
Image resolution is how many pixels fit in a unit of length. One pixel per centimetre equals 2.54 ppi, and one pixel per millimetre equals 25.4 ppi. Photo prints commonly aim for about 300 ppi, while screens usually run from about 72 to 400 ppi.
| UNIT | SYMBOL | EQUALS | VALUE OF 1 PPI |
|---|---|---|---|
| Pixel per inch | ppi | 1 ppi = 1 ppi | 1 ppi |
| Pixel per centimeter | px/cm | 1 px/cm = 2.54 ppi | 0.3937008 px/cm |
| Pixel per millimeter | px/mm | 1 px/mm = 25.4 ppi | 0.03937008 px/mm |
| Pixel per foot | px/ft | 1 px/ft = 0.083333333 ppi | 12 px/ft |
| Pixel per meter | px/m | 1 px/m = 0.0254 ppi | 39.37008 px/m |
| Pixel per point | px/pt | 1 px/pt = 72 ppi | 0.01388889 px/pt |
Common mistakes when calculating Digital Image Resolution
- Confusing ppi (pixels per inch) with dpi (printer dots per inch).
- Mixing px/cm and px/mm, which differ by 10.
- Assuming ppi changes the pixel dimensions of an image; it changes only the print size.
Digital Image Resolution FAQ
How many ppi is 1 px/cm?
1 px/cm is 2.54 ppi.
How many ppi is 1 px/mm?
1 px/mm is 25.4 ppi.
What ppi is good for printing?
Around 300 ppi is a common target for close-view photo prints.
What is the base unit for digital image resolution?
This converter uses pixel per inch (ppi) as the common base unit: every value is first converted to it and then to the target unit.
How do I convert between two digital image resolution units?
Choose the starting and target units, enter the value and read the result. By hand: convert to the base unit with the table, then divide by the target unit factor.
How many pixels per centimeter are in 1 pixel per inch?
1 ppi = 0.3937008 px/cm.
How many pixels per millimeter are in 1 pixel per inch?
1 ppi = 0.03937008 px/mm.
How many pixels per inch are in 1 pixel per centimeter?
1 px/cm = 2.54 ppi.
Which digital image resolution units does this converter support?
It covers 6 units: pixel per inch (ppi), pixel per centimeter (px/cm), pixel per millimeter (px/mm), pixel per foot (px/ft), pixel per meter (px/m), pixel per point (px/pt).
How accurate is the digital image resolution converter?
Results are calculated at full double precision and shown to about 8 significant figures. Round the answer to the precision of your original measurement; a result cannot be more accurate than the number you started with.
More in Digital Image Resolution converters
- Pixels per millimeter to Pixels per inch Converter
- Pixels per centimeter to Pixels per millimeter Converter
- Pixels per millimeter to Pixels per centimeter Converter
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Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors, BIPM: the International System of Units (SI)