What Size Is a Half Sheet Pan?

On this page (7 sections)

1. What are the standard half sheet pan dimensions?
2. How do you measure a half sheet pan’s usable space?
3. Will a half sheet pan fit in your oven?
4. How does a half sheet compare with other baking sheet sizes?
5. Is a half sheet pan the same as a cookie sheet?
6. What should you check before buying a half sheet pan?
7. Which half sheet size should you choose?

A standard half sheet pan measures about 18 x 13 inches on the outside, with a smaller flat baking area inside its rim. Measure your oven rack and compare it with the pan's full exterior dimensions before you buy.

The phrase “half cookie sheet size” usually refers to this same common pan format. However, manufacturers can vary the exact measurements, and some cookie sheets have a different rim shape.

What are the standard half sheet pan dimensions?

A common half sheet pan is roughly 18 x 13 inches outside. Its usable baking surface is smaller because the rim takes up space.

For a concrete example, the Nordic Ware Naturals Half Sheet measures 17.9 x 12.9 x 1 inches outside and 17.1 x 12.1 inches inside. That difference matters when you’re planning how much food can sit flat on the pan.

Think of 18 x 13 inches as a nominal size, not a guarantee that every pan will match those numbers exactly. Check both exterior and interior dimensions when the pan needs to fit a specific oven or recipe.

How do you measure a half sheet pan’s usable space?

Measure the flat inside surface, from the inner edge of one rim to the inner edge opposite it. If a mat needs trimming to fit, see cutting silicone baking mats.

This gives a better estimate of where food can rest than the outside dimensions do.

A raised rim can contain juices and keep vegetables from sliding off. It also reduces the flat area available for cookies or other foods that need room to spread.

When comparing options, note the outer length and width, interior length and width, and side height. For a deeper pan, compare options in our guide to best deep half sheet pans.

Is a 13 x 18 inch pan the same as a half sheet?

Usually, yes: 13 x 18 inches is the familiar nominal half sheet size. The actual pan may be a little smaller or larger, and the usable flat area will be smaller still.

Some brands list only outside measurements, while others provide both outside and inside dimensions. If you’re replacing a pan, measure the old one across its widest points and across its flat interior.

Will a half sheet pan fit in your oven?

A half sheet pan fits only if its outside width and length fit the usable rack area. Measure the rack rather than guessing from the oven’s advertised capacity.

Check the opening between the oven walls and the space from the closed door to the back of the cavity. A pan needs enough clearance to slide in and out without scraping the walls or catching on the door.

For ovens with a smaller cavity, a quarter sheet can be easier to place. The USA Pan quarter sheet measures 13 x 9.5 inches outside and has a 12.5 x 9 inch baking surface.

USA Pan describes this pan as suitable for toaster ovens, but you should measure your appliance first. A compact pan is useful only if it clears the rack, walls, and door.

How much oven clearance should you leave?

Leave enough space to slide the pan in and out without forcing it. The exact clearance depends on your oven, rack position, and how the door opens.

A pan that barely fits may be awkward to handle, especially when it holds hot food. If your rack measurements are close to the pan’s exterior size, choose a smaller sheet or confirm fit with a removable rack before cooking.

How does a half sheet compare with other baking sheet sizes?

A half sheet is larger than a quarter sheet, but labels like “small,” “medium,” and “large” don’t always match standard pan sizes. Compare the actual dimensions whenever you need a precise fit.

The GoodCook Everyday Nonstick Baking Sheet Set includes pans with stated sizes of 13 x 9, 15 x 10, and 17 x 11 inches. That range offers smaller choices, though none of those stated sizes is the common 18 x 13 half sheet.

Some pan sets describe their sizes by the sheet’s length and width, while their full outside dimensions can differ. Check the listed measurements and pan shape before treating a “large” sheet as a half sheet.

For bread baked in a long, covered pan, see Pullman loaf pans.

For a wider look at pan options, see our bakeware sets buying guide. If you want to compare standard half sheet options, start with best half sheet pans.

Is a half sheet pan the same as a cookie sheet?

A half sheet pan is often used for cookies, but “cookie sheet” can describe pans with different edges and dimensions. Traditional sheet pans have a raised rim around all sides, while some cookie sheets have a lowered edge that helps cookies slide off.

For baking cookies, the flat area and edge shape both affect how many cookies fit and how easy they are to remove. Our guide to the best baking sheet for cookies focuses on that use.

A lid is useful when you need to cover or carry baked food. If you use a rack for cooling or baking, check oven-safe cooling racks.

Compare options in best baking sheets with lids if storage is part of your decision.

What should you check before buying a half sheet pan?

Check outside dimensions first for oven fit, then check the interior dimensions for usable baking space. Also look at rim height and material if those details matter to your cooking.

Use this quick checklist:

• Measure your oven rack’s usable width and depth.
• Compare those measurements with the pan’s outer dimensions.
• Check the flat interior area for cookie or meal capacity.
• Confirm whether the pan has a raised rim or a lowered edge.
• Look for care instructions that suit how you plan to use it.

If you plan to roast a full meal on the pan, size and rim shape affect how ingredients fit. Our guide to the best baking sheet for sheet pan meals covers pans for that purpose.

For single-use cooking or serving, compare best disposable half sheet pans. Their dimensions still need to match your oven or serving setup.

Which half sheet size should you choose?

Choose a pan near 18 x 13 inches outside if you want the common half sheet format and your oven has enough room. Pick a smaller sheet if your oven is compact or if you usually bake small batches.

For the most accurate fit, compare the pan’s outside dimensions with your oven rack and its interior dimensions with the food you plan to cook. If a covered pan would suit your storage needs, see best cookie sheet with lid.

Frequently asked questions

What are the dimensions of a half sheet pan?

A common half sheet pan is about 18 x 13 inches on the outside. The flat baking area is smaller because the pan has a rim, and dimensions can vary by brand, so check the stated exterior and interior measurements before buying.

Is a 13 x 18 pan a half sheet?

Yes, 13 x 18 inches is the common nominal size for a half sheet pan. The exact outside dimensions may be slightly larger, while the usable flat area is smaller; measure the pan itself and your oven rack when fit matters.

Will a half sheet pan fit in my oven?

It depends on the oven's usable rack width and depth, plus the pan's outside dimensions. Measure the rack opening with the oven door open and allow room to slide the pan in without forcing it against the walls.

What is the difference between a half sheet pan and a cookie sheet?

A half sheet pan usually has raised sides around the full perimeter, while a cookie sheet often has one or more lowered edges for sliding cookies off. Names vary, so compare the pan's measurements and rim shape instead of relying on the label.