640 Pixels to Inches
640 pixels is 6.6667 inches at the 96 PPI screen standard, 4.2667 inches at 150 DPI and 2.1333 inches at 300 DPI.
Edit any field to convert a different size at the same resolution.
640 pixels in inches at every common resolution
The physical size depends entirely on the density you print or display at — these are the values people look up most.
| Resolution | Inches | In centimetres |
|---|---|---|
| 72 PPI | 8.8889 | 22.578 |
| 96 PPI | 6.6667 | 16.933 |
| 150 PPI | 4.2667 | 10.837 |
| 300 PPI | 2.1333 | 5.4187 |
| 600 PPI | 1.0667 | 2.7093 |
How the conversion works
Inches are found by dividing the pixel count by the pixel density: inches = pixels ÷ PPI. For 640 pixels at 96 PPI that is 640 ÷ 96 = 6.6667.
640 pixels is a single edge, and what it measures depends entirely on the density it is read at — which is why every row of the table above gives a different answer.
Printed at 300 DPI it covers 2.1333 inches.
At that size a print is held or read close up, where 300 DPI is the density to work to. On a 96 PPI screen the same pixels span 6.6667 inches.
In metric, 640 pixels at 300 DPI is 5.4187 cm, and at 96 PPI it is 16.933 cm.
Frequently asked questions
How many inches is 640 pixels?
6.6667 inches at 96 PPI, 4.2667 inches at 150 DPI and 2.1333 inches at 300 DPI. Divide the pixels by the density you are using.
What size does 640 pixels print at 300 DPI?
2.1333 inches, which is 5.4187 cm. 300 DPI is the standard for photo and magazine printing.
What is 640 pixels in centimetres?
16.933 cm at 96 PPI, or 5.4187 cm at 300 DPI.
Should these pixels be printed at 300 DPI?
Yes, if the print is held or read close up. At 300 DPI they cover 2.1333 inches, which is what that standard is for. At 150 DPI the same pixels stretch to 4.2667 inches and the softening shows in the hand.
Why is there no single answer in inches?
Because pixels carry no physical size of their own. Only the pixel density fixes how much space they occupy, which is why every row of the table above gives a different result.