Measure your pans
Compare round or rectangular pans in inches or centimeters. Use the same batter depth, or enter the actual depth you intend in each.
A LITTLE MATH. A BETTER START.
The bake you love.
The pan you own.
Your recipe calls for an 8-inch pan. Yours is 9. Work out the change, scale every ingredient, and keep the assumptions in view.
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FROM QUESTION TO QUANTITIES
One change. A clear calculation.
Start with a recipe you trust. Manna handles the arithmetic while you keep control of the bake.
Bring your ingredients
Enter amounts as decimals, fractions or mixed numbers. Keep the original quantities beside the adjusted ones. Portion scaling is a separate option.
Copy or print the result
Save the quantities and their assumptions before you close the page. Nothing is uploaded or saved to an account, and reloading clears the form.
KNOW WHAT THE NUMBER MEANS
Good arithmetic.
Honest limits.
A pan ratio estimates the change in mixture quantity for straight-sided pans. It does not predict baking time, oven temperature, rising, or doneness. Tapered, fluted and tube pans need a different capacity check.
A cup also needs a definition. The calculator distinguishes US customary, 240 mL and 250 mL cups. It converts mass to mass and volume to volume; it does not guess how many grams your cup of flour weighs.
See the method and measurement sources →THE QUESTIONS BEHIND THE CALCULATOR
Make the next step less guesswork.
PAN SHAPES
From a round pan to a square one
Follow an 8-inch round to 9-inch square example, with area, ingredient math and the checks that matter.
Read the guide →BATTER DEPTHWhen a taller pan changes the answer
Separate the height of the pan from the depth of the mixture, and see when an area ratio is enough.
Read the guide →PRACTICAL AMOUNTSWhat to do with part of an egg
Keep precision through the calculation, then choose a measurable amount without silently rounding the recipe.
Read the guide →Looking for Manna’s Bible tools?
The original timelines, people, journeys and reading tools remain available at their existing addresses. Start in the Bible atlas archive.