Print size calculator for pixels, inches, centimeters and DPI: convert in any direction and use presets for tee fronts, mug wraps and posters before you design.
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DPI (dots per inch) is how many pixels of your image land on each inch of the printed product. A print-on-demand printer spreads your file across the product's print area, so the pixels you upload divided by the print size is what decides how sharp the result looks. Strictly, that figure is PPI (pixels per inch), but print services call it DPI, and so does this calculator.
Aim for 300 DPI for crisp edges and small text. Between 150 and 299 DPI, bold graphics usually look fine while fine detail starts to soften. Below 150 DPI, blur and jagged edges tend to show at normal viewing distance.
The DPI number saved inside a file, the one an export dialog asks for, is only a label. A 4500 × 5400 px file holds exactly the same detail whether it is tagged 72 or 300 DPI; only more pixels make a bigger print sharper.
| Product or paper | Inches | Centimetres | Pixels at 300 DPI | Megapixels | Load into the calculator |
|---|---|---|---|---|---|
| T-shirt front, standard | 12 × 16 | 30.5 × 40.6 | 3,600 × 4,800 | 17.3 | |
| T-shirt front, large | 15 × 18 | 38.1 × 45.7 | 4,500 × 5,400 | 24.3 | |
| Hoodie front | 13 × 13 | 33 × 33 | 3,900 × 3,900 | 15.2 | |
| Sweatshirt front | 12 × 16 | 30.5 × 40.6 | 3,600 × 4,800 | 17.3 | |
| Mug 11 oz, full wrap | 8.5 × 3.5 | 21.6 × 8.9 | 2,550 × 1,050 | 2.7 | |
| Mug 15 oz, full wrap | 8.5 × 4 | 21.6 × 10.2 | 2,550 × 1,200 | 3.1 | |
| Tote bag | 14 × 16 | 35.6 × 40.6 | 4,200 × 4,800 | 20.2 | |
| Poster | 18 × 24 | 45.7 × 61 | 5,400 × 7,200 | 38.9 | |
| Poster | 24 × 36 | 61 × 91.4 | 7,200 × 10,800 | 77.8 | |
| Sticker | 3 × 3 | 7.6 × 7.6 | 900 × 900 | 0.8 | |
| US Letter page | 8.5 × 11 | 21.6 × 27.9 | 2,550 × 3,300 | 8.4 | |
| A4 page | 8.27 × 11.69 | 21 × 29.7 | 2,480 × 3,508 | 8.7 |
Print areas are typical sizes; check your print provider's template for the exact one. Pixel counts are rounded to the nearest pixel.
Print sizes are quoted in inches or centimeters, image files are measured in pixels, and DPI sits between the two. This print size calculator converts between all four in any direction. Enter a pixel size to see how large it can print, enter a print size to see how many pixels you need, or begin from a preset for a common print-on-demand print area such as a tee front, a mug wrap or a poster.
Everything else follows from those two lines. Divide pixels by DPI and you get inches; divide pixels by inches and you get the DPI a file will print at.
Say a design file measures 4500 x 5400 pixels. At 300 DPI it prints at 15 x 18 inches, larger than a 12 x 16 inch tee front, so it fits that preset with room to spare. Stretched across the width of an 18-inch poster, though, the same file would reach only 250 DPI, which may look a touch soft when someone stands close. Knowing that before you list the poster size saves a disappointed buyer and a reprint.
Print-on-demand sellers use it to size a canvas before drawing, so the artwork is big enough for the largest product it will appear on. It also helps when a buyer requests a custom print size, when you prepare printable wall art downloads in several sizes, or when a supplier quotes dimensions in centimeters while your software works in inches. Instead of separate tools for pixels to inches and pixels to cm, the conversions sit together here with DPI built in.
The calculator runs on your device and uploads nothing, so it works as a quick DPI calculator even when you have no file at hand. It is free, with no sign-up, and it gives the same answer whether you start from the file, the print or the resolution. That makes it a practical image size calculator for printing to keep open while you plan a new product line.
Choose the value you know and the one you want, or pick a preset. The other fields update as you type.
When the numbers show a file is too small, the reliable fix is a bigger canvas at the source, not a resize of the finished image.