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Free tool · No sign-up · 10 seconds
Free Wedding Cake Size Calculator
Find the cake size and tier setup that feeds your guest count, with dessert and coffee portion counts. Instant result, no sign-up.
Your cake
Change anything here and the tiers rebuild.
Cake for 100 guests
12" · 8" · 6"
A 3-tier round cake serving about 92 coffee portions. You need 85, so you have 7 spare.
12" tier — 56 portions
8" tier — 24 portions
6" tier — 12 portions
At a glance
Numbers to take to your baker.
Portions needed
85
Portions in this cake
92
Spare portions
7
Tiers
3
Why it helps
- Tier sizes that actually feed your guest count
- Compare dessert portions with smaller coffee servings
- See where a kitchen cake saves money on a tall display
The most photographed minute
Everyone points a phone at the cake cutting. Almost nobody sends you the photo.
OnceRoll pulls every angle of the moment into one shared roll, from every phone in the room.
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Frequently asked questions
Wedding Cake Size Calculator questions
What size wedding cake do I need for 100 guests?
Roughly a three-tier cake in dessert portions, or a smaller stack plus a kitchen cake. Enter your guest count above for the exact tier sizes.
What is the difference between dessert and coffee portions?
Dessert portions are the larger plated slice. Coffee portions are about half the size and are what most bakers quote, which is why cakes often feed more people than couples expect.
Do we need cake for every guest?
No. Many couples plan for around eighty percent of guests, especially when there is another dessert. The calculator lets you set that share.
Do I need to create an account to use this tool?
No. The tool is free, needs no sign-up, and shows a result in your browser. Nothing is uploaded. OnceRoll the app is separate: you create a photo, video, or voice guestbook there, and guests join from a QR code with no account.