Baking Pan Converter

How to use the Baking Pan Converter

1. 1Enter the shape and size of both pans.
2. 2Pick the units or options from the menus if the pan size change tool offers them.
3. 3Read the pan size change in the large result box.
4. 4Look at the extra rows for related figures.
5. 5Press Copy result to keep the answer.

When you need the pan size change

Home bakers use it for cakes, brownies and lasagnes whenever the right pan is missing.

Keep the depth of the batter about the same. If you scale by a big factor, check the baking time: a thinner layer cooks sooner and a thicker one needs longer and a lower oven.

How the pan size change is worked out

Round area = π × (diameter ÷ 2)². Square area = side². Rectangle area = width × length. The scale factor = your pan's area ÷ the recipe pan's area. A recipe for a 23 cm round pan (415 cm²) baked in a 33 × 23 cm rectangle (759 cm²) needs the quantities multiplied by 1.83.

Every answer on this page comes from that one rule, so you can check any result by hand with a calculator. The figures shown underneath, such as other units, are conversions of the same answer.

• Round, square and rectangle
• Area comparison
• Scale factor

Mistakes to avoid with pan size change

Measure the inside of the pan, not the outside rim, and use the same unit (all cm or all inches). The tool compares area only, not the pan's depth.

On phone and computer

On a phone, type into the boxes one after another and read the pan size change underneath; Copy result puts it on the clipboard for a message or a note. On a computer the inputs sit on the left and the answer on the right, so you can change one figure and watch the pan size change move. The baking pan converter works the same on both.

Checking your pan size change by hand

A good habit is to test the baking pan converter with a case you already know. A recipe for a 23 cm round pan (415 cm²) baked in a 33 × 23 cm rectangle (759 cm²) needs the quantities multiplied by 1.83.

If your own figures give a surprising answer, repeat the working yourself: Round area = π × (diameter ÷ 2)². Square area = side². Rectangle area = width × length. The scale factor = your pan's area ÷ the recipe pan's area. Small differences usually come from rounding, from mixing units, or from a typing slip in one of the inputs. A new pan often changes more than the size; the recipe amounts may need to change too. Use the Recipe Scaler to adjust the ingredients, and the Cooking Measurement Converter to move between cups, grams and millilitres. The Temperature Converter helps when an oven setting is written in a different scale.

Features

• Measure inside the pan
• Same units
• Watch the depth
• Clear messages when the pan size change inputs make no sense
• Copy the result with one tap
• Private: nothing is uploaded

Frequently asked questions