Casserole Dish Calculator
Pick the dish you have and the dish the recipe wants. The calculator returns the scale factor, the servings in your pan, and the depth rule that decides the bake time.
Every casserole question is the same question - my pan is not the recipe pan - and the answer is one division plus one physical rule: batter at the same depth bakes at the same time. The area ratio scales the ingredients; the depth tells the clock.
How to use
- Your dish first, then the dish the recipe was written for.
- Read the scale factor - multiply every ingredient by it.
- Check the depth note: same depth means same clock, shallower means check sooner. Updates live.
Frequently asked questions
Can I use an 8x8 instead of a 9x13?
Yes - an 8x8 holds 55 percent of the 9x13 area, so scale the recipe to 0.55x or simply bake half and freeze the rest in the second 8x8. Same batter depth bakes the same time; the calculator confirms the factor for any pan pair.
How many servings does a 9x13 casserole hold?
About 12 side-dish servings or 8 main-course squares at standard depth - roughly one serving per 9 square inches. The calculator converts your actual dish to the same measure so portion planning stops being a guess.
Does bake time change with pan size?
Only through depth: the same inch-deep batter bakes the same minutes whatever the pan label says. Shallower bakes faster, deeper needs extra minutes - start checking at 80 percent of the recipe clock whenever the depth moved.
How do I halve a 9x13 recipe?
Bake it in an 8x8 - the halved batch happens to match the 8x8 area almost exactly at the same depth, which is why the 9x13-to-8x8 swap is the most common pan conversion in home baking. The calculator verifies the factor and the servings before you crack the eggs.