How to calculate print size from pixels
To find physical print dimensions, divide the image width and height in pixels by the selected pixels-per-inch value.
For example, a 6000 × 4000 pixel image at 300 PPI can produce a 20 × 13.333 inch print without changing its pixel dimensions.
How to calculate pixels needed for a print
The calculator can also work in reverse. Enter the desired physical print width and height together with the target PPI.
For example, a 10 × 8 inch print at 300 PPI requires about 3000 × 2400 pixels.
What does PPI mean for printing?
PPI means pixels per inch. In this calculation, it describes how many image pixels are assigned to each inch of physical print size.
Increasing the target PPI requires more pixels for the same physical print dimensions. Decreasing it allows the same image pixels to cover a larger print area.
PPI vs. printer DPI
Image PPI and printer DPI are related concepts but are not identical. PPI describes image pixels per physical inch, while printer DPI describes physical printer dots.
A printer may use multiple ink dots to reproduce the color and tone represented by a single image pixel, so its advertised DPI should not automatically be entered as the image PPI.
Inches and centimeters
Print dimensions can be entered in either inches or centimeters when calculating required pixels. The calculator converts centimeters using 2.54 centimeters per inch before applying PPI.
Image aspect ratio and print cropping
An image and a target print shape can have different aspect ratios. If the ratios do not match, printing edge to edge may require cropping or adding borders.
Use the Aspect Ratio Calculator to compare or resize dimensions while preserving a ratio.
Megapixels and print size
Megapixels describe total pixel count, but print dimensions also depend on aspect ratio and the PPI selected for output.
A 6000 × 4000 image contains 24 megapixels. At 300 PPI it corresponds to 20 × 13.333 inches, while at 150 PPI it corresponds to 40 × 26.667 inches.
Print size and image file size
Pixel dimensions do not by themselves determine the compressed file size of an image. File format, compression, bit depth and image content can all affect storage size.
For general storage-unit conversion, use the File Size Calculator.
This calculator converts pixel dimensions, physical dimensions and PPI. It does not determine whether a particular PPI is sufficient for a specific printer, artwork, viewing distance or quality requirement.
Frequently asked questions
How large can I print an image at 300 PPI?
Divide the image width and height in pixels by 300. For example, 6000 × 4000 pixels gives 20 × 13.333 inches.
How many pixels do I need for a 10 × 8 print at 300 PPI?
Multiply each dimension by 300. A 10 × 8 inch print requires approximately 3000 × 2400 pixels.
Is PPI the same as DPI?
No. PPI describes image pixels per inch, while DPI normally describes physical printer dots per inch.
Can I use centimeters?
Yes. In reverse mode, enter the desired print width and height in centimeters and the calculator converts them before calculating pixels.
Will the calculator tell me if my image will look good?
No. It calculates resolution relationships only. Perceived print quality also depends on the source image, printer, processing and viewing conditions.
Using this calculator effectively
The Print Size Calculator converts image pixel dimensions and PPI into physical print dimensions. It can also calculate the approximate pixel dimensions required for a desired print width, height and PPI.
Common uses
- Finding how large an image can print at a selected pixels-per-inch value.
- Calculating the pixel dimensions needed for a target print size in inches or centimeters.
- Comparing print dimensions, megapixels and aspect ratio before preparing an image for output.
Tips for a better estimate
- Use the actual image pixel dimensions rather than dimensions reported after display scaling.
- Use image PPI for the calculation rather than assuming a printer's advertised DPI is the same measurement.
- Check aspect ratio before printing because a target print shape that differs from the image ratio may require cropping or borders.
Related calculations
PPI Calculator · Aspect Ratio Calculator · Audio File Size Calculator