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Calculating a Cake Circumference
By Bo Friberg
Published 2003
To calculate the circumference (the perimeter) of a cake using pi (3.14), multiply the diameter of the cake times pi(or simply multiply by 3 and add a little). You may need to calculate the circumference to cut out strips of paper to line the inside of a cake pan, for example, or if you are making a chocolate band to wrap around a finished cake. The chart below shows the basic math using pi.
| Diameter | Calculation | Circumference |
| 8-inch (20-cm) cake | 8 x 3.14 or 20 x 3.14 | 25.02 inches (62.6 cm) |
| 10-inch (25-cm) cake | 10 x 3.14 or 25 x 3.14 | 31.4 inches (78.7 cm) |
| 12-inch (30-cm) cake | 12 x 3.14 or 30 x 3.14 | 37.68 inches (93.8 cm) |
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