CM to Pixels Calculator at Any DPI
Convert centimeters to pixels (and vice versa) for exam photos, signatures, print design, and document uploads. Choose the DPI specified by your form.
For most Indian government exams (SSC, IBPS, UPSC), 200 or 300 DPI is required.
Common Exam Sizes
Pixels = (cm × DPI) ÷ 2.54Common Exam Conversions
At 300 DPI (High Quality)
| Centimeters (cm) | Pixels (px) |
|---|---|
| 1.5 cm | 177 px |
| 3.0 cm | 354 px |
| 3.5 cm | 413 px |
| 4.5 cm | 531 px |
At 200 DPI (Standard)
| Centimeters (cm) | Pixels (px) |
|---|---|
| 1.5 cm | 118 px |
| 3.0 cm | 236 px |
| 3.5 cm | 276 px |
| 4.5 cm | 354 px |
Frequently Asked Questions
How many pixels are in 1 cm?
It depends on the resolution (DPI). At 300 DPI, 1 cm equals 118 pixels. At 200 DPI, 1 cm is 79 pixels. At standard screen resolution (96 DPI), 1 cm is 38 pixels.
What is 3.5 cm x 4.5 cm in pixels?
At 300 DPI (standard for printing and most exam forms), 3.5 cm x 4.5 cm is exactly 413 x 531 pixels. At 200 DPI, it is 276 x 354 pixels.
What is the formula to convert cm to pixels?
The formula is: Pixels = (Centimeters x DPI) ÷ 2.54. Because 1 inch is exactly 2.54 centimeters, you first convert cm to inches, then multiply by DPI (Dots Per Inch).
Which DPI should I use for government exams?
Use the DPI stated in the active notification. DPI changes the pixel calculation; it does not override a portal's exact width, height, format, or KB rules.
What is 3.5 cm x 4.5 cm in pixels at 300 DPI?
At 300 DPI, 3.5 cm x 4.5 cm is approximately 413 x 531 pixels. Confirm the form's stated DPI and pixel dimensions before uploading.
Why are my calculated pixels different from the portal requirement?
Centimeters convert to different pixel values at different DPI settings. Select the DPI used by the active form, then check the portal's exact pixel and file-size limits separately.
Paste an error or check an official upload phrase
Paste or type the exact message shown by the CM to pixels conversion application, or choose a verified notice phrase below. It is analyzed in your browser only; the message and files are not uploaded.
Fix wrong pixel dimension errors
If a form reports that the image dimensions are incorrect, compare the notification's DPI, width, height, format, and KB rules before changing the file. A correct centimeter conversion alone does not guarantee portal acceptance.
- Wrong pixel dimensions: select the DPI specified by the form and recalculate.
- 3.5 cm photo size in pixels: check whether the form expects 413x531 px at 300 DPI or another value.
- DPI not specified: do not guess; use the portal's current instructions.