Photo Paper Sheets by Area

Photo Paper Sheets by Print Area

Planning a darkroom session, or putting in a batch order of fine-art prints? Either way you have to estimate how many sheets cover a given total area. The formula is sheets = ceil(totalArea / sheetArea), and you always round up, since nobody sells half a sheet. Standard photo paper sizes come in imperial units: 8×10" (~20×25 cm, 500 cm²), 11×14" (~28×36 cm, 1008 cm²), 16×20" (~41×51 cm, 2091 cm²) and 20×24" (~51×61 cm, 3111 cm²).

European labs carry metric sizes too: 18×24 cm (432 cm²), 24×30 cm (720 cm²), 30×40 cm (1200 cm²) and 40×50 cm (2000 cm²). For a rough price sense (2026, BRL): a 25-sheet box of Ilford Multigrade IV RC 18×24 cm runs R$ 200–400. The 100-sheet box of Foma Fomabrom 24×30 cm costs less per unit, but it only pays off if you print a lot. Sealed, the paper keeps 1–2 years, and refrigerated it can last up to 5.

Applications

It helps when you budget an analog photography project, work out cost per print for a show, or plan a bulk order of Ilford or Foma paper. It also covers the waste margin for test strips and the back-and-forth between imperial and metric sizes when you buy from European or American suppliers.

FAQ

Should I add extra for test strips? Yes. Pad the count by 15–20% for tests and rejects. A box of 25 usually gives you 18–20 finished prints.

RC or FB cheaper? RC (resin-coated) costs about 30% less than FB (fiber-based) and dries flat. FB is the choice for archival and gallery work.

Why imperial sizes? History, mostly. Kodak settled on 8×10" back in the early 1900s. European brands like Ilford and Foma sell both metric and imperial.