Short answer
A standard three tier wedding cake with 6, 9, and 12 inch tiers usually serves around 100 people. If the tiers are 6, 8, and 10 inches, expect around 75 servings. Confirm with your baker.
The number of servings in a three tier cake depends on the size of each tier and how the baker cuts it. A common three tier combination is 6 inches, 9 inches, and 12 inches across. With standard portions of about 1 inch by 2 inches, that cake typically serves around 100 people. A smaller three tier cake, with 6, 8, and 10 inch tiers, usually gives around 75 servings. Some bakers cut larger portions, which reduces the number of servings, while others cut smaller pieces for a lighter dessert. If you are serving cake after a big meal, smaller portions are fine. If cake is the main event, you may want larger slices. Always ask your baker for a serving guide based on their cutting style. You can also ask them to cut the cake for you, which ensures even portions. If you need more servings than your three tier cake provides, you can add a sheet cake in the kitchen, or choose larger tier sizes.
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