Estimate how much fondant you need to cover a round or square cake with our free calculator. This tool determines the fondant needed based on cake dimensions.
51.3 oz
/ 1454 g
Achieving a flawless, smooth finish on a cake starts with rolling out the right amount of fondant. Roll it too thin, and it tears; roll it too thick, and you waste expensive ingredients. Our Fondant Quantities Chart and calculator takes the guesswork out of decorating. Simply enter your cake's diameter and height, and we'll tell you exactly how many ounces or grams of fondant you need to cover it perfectly, including a buffer for trimming.
Standard industry practice is 1/8 inch (approx 3mm). This provides enough stability to lift and drape without tearing, but isn't so thick that it overpowers the cake's flavor. The calculation above assumes this thickness.
No, this calculates the amount strictly for covering the cake. If you plan to make fondant figures, bows, or ruffles, you should add an extra 0.5 - 1 lb (250-500g) of fondant to your total.
We include a "Buffer Zone" (trimming allowance) in the math. You physically need a larger circle of fondant than the cake's surface area to be able to smooth the sides down without pleats. You will cut off the excess at the bottom.
Getting the right amount of fondant ensures a smooth finish without wasting expensive materials. Use these guidelines for perfect coverage.
Standard charts assume a 4-inch tall cake. If your cake is taller (like modern barrel cakes), you need to measure the exact height and diameter.
Professional decorators roll fondant to about 1/8 to 1/4 inch thickness. Rolling too thick wastes fondant and creates an unpleasant eating experience.
Always calculate an extra 2-3 inches of diameter to give yourself enough "drape" to prevent tearing the edges while smoothing.
Answers to common questions about working with rolled fondant.