A muffin or cupcake tray is a mold in which muffins or cupcakes are baked. A single cup within a regular muffin tin is 100 millilitres (3.5 US fl oz)^{[citation needed]} and most often has room for 12 muffins, although tins holding 6, 8, 11, 24, and 35 muffins do exist. A single cup within a mini muffin tin is 62.8 millilitres (2.125 US fl oz)^{[citation needed]}, and because these are less common, there are several standard numbers of cups per tin, including 6, 12, and 24 cups per tin. A single cup within a jumbo muffin tin is 242.13 millilitres (8.1875 US fl oz)^{[citation needed]}, and again because these are uncommon, there are several standard numbers of cups per tin, including 4, 6, and 12 cups per tin.^{[1][failed verification]}

Muffin tins can be made out of aluminum, stainless steel, cast iron, or silicone. In addition, aluminum and stainless steel muffin tins may be coated with Teflon or other non-stick coatings. Historically, galvanized steel has been used for muffin tins but this is no longer common.^{[citation needed]}