Free Pixel Calculator
Calculate the pixel dimensions, print size, or DPI you need for your artwork. A free browser-based tool for DTF, DTG, screen print, and digital design workflows.
Free — no account requiredNo files are uploaded. Image dimensions are read locally in your browser — nothing is sent to a server, and there's no account, database, or install required.
Upload an image
Print size
Required resolution
1,200 × 1,800 px
2.2 MP
Physical size
4.00 × 6.00 in
10.16 × 15.24 cm
Print density
300 DPI
High QualitySize context
Letter / A4 paper
Optimal viewing distance
11 in (28 cm)
Formula used
Required pixels = print size in inches × DPI
DPI is a general print-preparation guide. Final print quality also depends on the artwork, printer, ink, substrate, viewing distance, and production workflow.
How it works
Pixels, print size and DPI, explained.
Use the Pixel Calculator to prepare artwork for print. Convert physical print sizes to pixel dimensions, estimate final print size from an image, or calculate the effective DPI of an existing file.
Required Pixels
Required pixels = print size in inches × DPI
Enter a physical width and height in inches, centimeters or millimeters, plus a target DPI, to get the pixel dimensions your artwork needs.
Print Size
Print size in inches = pixels ÷ DPI
Enter a pixel width and height, plus a DPI, to see the largest size an image can print at without losing quality.
DPI
DPI = pixels ÷ print size in inches
Enter an image's pixel dimensions and the physical size you plan to print it at to see its effective print density.
Free Pixel Calculator is a free, browser-only tool for DTF printers, DTG printers, screen printers, print shops, designers and apparel decorators preparing artwork for print. It supports three calculator modes — Required Pixels, Print Size, and DPI — and inches, centimeters and millimeters as physical units. Uploaded images are never sent to a server; their pixel dimensions are read locally in your browser.
FAQ
Pixel calculator questions, answered.
What is a pixel calculator?
A pixel calculator converts between a physical print size, a pixel resolution and a DPI (dots per inch) value. Give it any two of the three and it works out the third, so you know an image will print sharp before you send it to a press.
How do I calculate pixels for print?
Required pixels = print size in inches × DPI. Convert centimeters or millimeters to inches first, then multiply width and height by your target DPI and round to whole pixels.
How many pixels do I need for a 300 DPI print?
Multiply each dimension in inches by 300. A 4 × 6 in print at 300 DPI needs 1200 × 1800 pixels; an 8 × 10 in print at 300 DPI needs 2400 × 3000 pixels.
How do I calculate print size from pixels?
Print size in inches = pixels ÷ DPI. Divide the pixel width and height by your DPI to get the printable size — 2400 × 3000 pixels at 300 DPI prints at 8 × 10 in.
How do I calculate DPI?
DPI = pixels ÷ print size in inches. Work it out for width and height separately — 1200 × 1800 pixels printed at 4 × 6 in comes out to 300 DPI on both. If the two don't match, the lower value is the effective DPI, since that's the dimension limiting print density.
Is the Pixel Calculator free?
Yes. The Pixel Calculator is completely free, with no login or account required, and runs entirely in your browser.
Are uploaded images stored or uploaded?
No. Images are never uploaded anywhere — the calculator reads an image's native pixel dimensions locally in your browser using an object URL, which is revoked as soon as you remove or replace the preview.