Standard Loaf Pan Size cm | The Two Sizes Bakers Actually Use

The standard loaf pan size is most often 23 x 13 cm, the metric equivalent of the US standard 9 x 5 inch pan.

When a recipe calls for a “standard” loaf pan, that 23 x 13 cm (9 x 5 in) size is what most modern baking sources mean. But there’s a catch worth knowing before you preheat the oven: plenty of recipes, especially older ones, assume a smaller 22 x 11 cm (8.5 x 4.5 in) pan. Choosing the wrong one can mean overflow down the side of your oven or a squat, underfilled loaf.

Here’s how to know which pan your recipe expects and why the difference matters more than you’d think.

Why “Standard” Means Two Different Sizes

Both the 23 x 13 cm and the 22 x 11 cm pan are sold and described as “standard,” which makes shopping confusing. The 22 x 11 cm (8.5 x 4.5 in) size is the older, classic US standard that appears in many traditional cookbooks. The 23 x 13 cm (9 x 5 in) pan became the more common modern standard as recipes and bakeware lines shifted over the decades.

The practical result: if a recipe just says “loaf pan” without a dimension, it’s usually a safe bet it means the 23 x 13 cm size — but when a recipe specifies a size, follow it.

How to Match Your Pan to a Recipe

The easiest way to avoid a baking disaster is to read the recipe’s flour amount. King Arthur Baking’s guidance is straightforward for yeast breads: recipes using about 3 cups of flour or less fit best in the smaller 22 x 11 cm pan. Recipes with at least 3.75 cups of flour should generally go into the larger 23 x 13 cm pan.

This rule exists because batter and dough need room to rise. Put a full-size dough into the smaller pan and it will climb over the rim; put a small dough into the larger pan and you get a short, dense loaf that bakes too quickly on the outside. This same logic applies to quick breads like banana bread, where the batter should fill the pan only about two-thirds to three-quarters full to leave room for the rise.

Dimensions, Depth, and Volume: A Quick Comparison

Knowing the top dimensions alone isn’t enough — the pan’s depth and resulting volume matter just as much.

Remember that metric conversions are rounded — “23 x 13 cm” is an approximation of 9 x 5 in, and “22 x 11 cm” approximates 8.5 x 4.5 in. A pan’s listed dimensions also typically measure the top exterior, so the true interior space is slightly smaller. If your recipe calls for a pan by capacity, like “6-cup loaf pan,” check the label over the top dimension.

That 9 x 5 x 3 in pan, with its 8-cup capacity, is also the size commonly recommended for a roughly 2 lb loaf of bread.

What Else Loaf Pans Are Used For

Loaf pans are hardly limited to bread. The same pan shape works for banana bread, zucchini bread, meatloaf, and loaf cakes like pound cake. The recipe will usually tell you which size to reach for, but if it doesn’t, the flour-volume rule and the two-thirds-fill guideline will keep you on track.

One thing to keep straight: a loaf pan is not the same thing as a pullman or pain de mie pan. Pullman pans are deeper and come with a lid to bake perfectly square sandwich loaves, and their dimensions don’t line up neatly with standard loaf pan sizes. If a recipe explicitly says pullman, use one.

When it’s time to bake, a dependable pan makes a real difference. Our roundup of the best bakeware loaf pans covers tested options for every budget and baking style.

FAQs

What is the difference between a 1 lb and 2 lb loaf pan?

The smaller 1 lb loaf pan is typically around 21 x 11 cm (8.5 x 4.5 in) with a 6-cup capacity, while a larger 2 lb loaf pan is usually about 23 x 13 cm (9 x 5 in) and holds roughly 8 cups. Recipes make it clear which size they expect, so it’s worth checking before you start mixing.

Can I use an 8.5 x 4.5 in pan if my recipe calls for 9 x 5 in?

Not without adjusting. The smaller pan holds less batter, so a recipe meant for the larger pan could overflow. If that’s all you have, fill it only two-thirds full and bake any extra batter in muffin tins — just check for doneness a few minutes earlier since the loaf will be deeper.

How do I measure how many cups a loaf pan holds?

Fill the pan with water one cup at a time, pouring carefully to the rim, and count how many cups it takes. This tells you the pan’s true capacity regardless of what the label claims, which is the reliable way to confirm a recipe will fit.