Photo size chart: centimetres to pixels at 300 DPI

By CraftCrop · Updated 4 November 2026

When preparing a photo for a resin mould, set the physical size in the CraftCrop editor. The pixel values below are a reference for a sharp source image at 300 DPI. They are approximate because pixels come in whole numbers.

How the estimate works

At 300 pixels per inch, one centimetre corresponds to about 118 pixels. For an accurate calculation, use pixels = centimetres ÷ 2.54 × 300, then round to the nearest whole pixel. A 5.5 cm circle therefore needs about 650 pixels across for a 300 DPI source.

For rectangles and ovals, check both width and height. For heart shapes, use the width and height settings in the editor; the same pixel-per-centimetre estimate applies to each dimension.

Source photo size and export size are different

CraftCrop exports the sheet at 300 DPI. A small source image may still look soft if enlarged. Choose the clearest original available and use the photo quality note in the editor as a guide.

Remember print scaling

Choose the right paper and print at Actual size or 100%. Fit-to-page settings can shrink or enlarge every shape. Measure one test print with a ruler before making a batch.