How to Scale a Recipe for a Smaller Pan
To scale a recipe for a smaller pan, divide the new pan’s area by the original pan’s area, then multiply all ingredients by that number. This preserves batter depth only when the pans have comparable shapes and straight sides.
- 3 min read
- Updated 2026-10-22
Printable reference chart
Use your browser’s Print command to print this chart and your scaled ingredient list.
| Original → new pan | Area ratio | Ingredient multiplier |
|---|---|---|
| 10-inch round → 8-inch round | 64 ÷ 100 | 0.64 |
| 9-inch round → 8-inch round | 64 ÷ 81 | 0.790 |
| 9×13 → 8×8 | 64 ÷ 117 | 0.547 |
| 9×9 → 8×8 | 64 ÷ 81 | 0.790 |
Round-to-round ratios use squared diameters because the common π/4 factor cancels. All sizes are inside inches.
Scale your ingredients
Paste your recipe into the scaler below, with one ingredient per line. The starting multiplier is 0.64; change it if your recipe or pan ratio differs. This scales amounts in their original units, not baking times or ingredient densities.
Work through one example
An 8-inch round pan has 64% of the area of a 10-inch round. A recipe with 250 g flour therefore needs 160 g. The scaler above starts at 0.64 for this example; enter your own area ratio for other pans. For rectangular pans, multiply length by width. For a round pan, multiply π by the radius squared.
Depth changes the problem
Putting the entire original batch into a smaller pan makes a thicker layer. That is not the same as scaling the recipe. A deeper layer may brown before its center sets, or rise above the rim. Scale the ingredients to retain depth instead of assuming a longer bake can fix excess batter.
Know when area is insufficient
Sloped loaf pans, fluted molds and tube pans are not simple flat rectangles or circles. For those, use tested pan-specific guidance or compare usable volumes at the intended fill depth. Keep the central tube when the recipe relies on it for heat transfer.
Use time as a reminder, not a multiplier
Retain the original temperature as a starting point. Begin observing before the recipe’s usual finish time and check the specified center texture or skewer cue. Avoid opening the door repeatedly while a delicate cake is setting. Record pan material, amount and actual finish time for your next batch.
Frequently asked questions
Do I halve the baking time for half the batter?
No. Batter depth and pan geometry matter more than the total batch fraction.
Can I leave the ingredient amounts unchanged?
That creates a deeper layer and may exceed the pan’s capacity.
Does area scaling work for a tube pan?
Not reliably by outer dimensions alone; use guidance for that pan shape.
What multiplier does the scaler start with?
It starts at 0.64, the factor for a 10-inch round recipe moved to an 8-inch round pan.