Pixel Calculator
Calculate pixel dimensions, resolutions, and aspect ratios for any image or display configuration.
Input Parameters
Results
Physical Width
6.4 inches
Physical Height
3.6 inches
Aspect Ratio
16:9
Megapixels
2.07 MP
Total Pixels
2,073,600
PPI
300
Common Resolutions
| Standard | Resolution | Aspect Ratio |
|---|---|---|
| 480p | 720×480 | 3:2 |
| 720p (HD) | 1280×720 | 16:9 |
| 1080p (Full HD) | 1920×1080 | 16:9 |
| 1440p (QHD) | 2560×1440 | 16:9 |
| 4K (UHD) | 3840×2160 | 16:9 |
| 8K (UHD) | 7680×4320 | 16:9 |
Print Sizes at 300 DPI
| Print Size | Pixels | Aspect Ratio |
|---|---|---|
| 4×6" | 1200×1800 | 2:3 |
| 5×7" | 1500×2100 | 5:7 |
| 8×10" | 2400×3000 | 4:5 |
| 11×14" | 3300×4200 | 11:14 |
| 16×20" | 4800×6000 | 4:5 |
| 20×30" | 6000×9000 | 2:3 |
About Pixel Calculator
The Pixel Calculator is a versatile tool that helps photographers, designers, and digital artists understand the relationship between pixel dimensions, physical size, and resolution (DPI/PPI).
How It Works
When you enter values for width, height, and DPI (dots per inch), the calculator:
- Calculates the physical dimensions (width and height in inches) by dividing the pixel dimensions by the DPI
- Determines the aspect ratio by finding the greatest common divisor of the width and height
- Calculates the total number of pixels and converts it to megapixels (1 megapixel = 1 million pixels)
- Displays the PPI (pixels per inch), which is the same as DPI in this context
Common Use Cases
- Print Preparation: Determine how large an image can be printed at a given resolution
- Screen Design: Understand how images will display on screens with different pixel densities
- Photography: Calculate the effective resolution of cropped images
- Web Design: Maintain consistent aspect ratios across different display sizes
Technical Notes
The calculator uses standard mathematical formulas for these calculations:
physicalWidth = widthPixels / dpi
physicalHeight = heightPixels / dpi
aspectRatio = simplifyRatio(widthPixels, heightPixels)
totalPixels = widthPixels * heightPixels
megapixels = totalPixels / 1,000,000The aspect ratio is simplified by dividing both numbers by their greatest common divisor (GCD). For example, 1920×1080 becomes 16:9 (divided by 120).