How Many Cake Slices Do I Need?

Quick answer: Plan on 1 slices per person. For 20 guests you need 20 slices, and for 50 guests you need 50 slices. Use our free calculator below for exact amounts.

Essential for celebrations! A standard 9-inch round cake serves 12 people.

20 slices

for 20 people

Estimated cost: $40 - $100

How Many Cake Slices for Your Party?

5 people 8 people 10 people 15 people 20 people 25 people 30 people 40 people 50 people 75 people 100 people

About Our Cake Calculator

Planning to serve cake slices at your next party? Our free calculator takes the guesswork out of party planning. Simply enter the number of guests and we'll tell you exactly how many slices you need.

How We Calculate Cake Quantities

Our calculations are based on industry-standard serving sizes used by professional caterers:

  • Average servings per person: 1 slices
  • Servings per slice: 1
  • Price range: $2 - $5 per slice

Tips for Ordering Cake Slices

  • Order 10-15% extra slices
  • Consider dietary restrictions (gluten-free, vegan)
  • Sheet cakes are more economical for large groups
  • Keep cake refrigerated until serving
  • Have a cake server and plates ready

Frequently Asked Questions About Cake

What size cake do I need for my party?

A 9-inch round cake serves 12-14 people. A half sheet cake (13x18) serves 36-40. A full sheet cake serves 70-80. Always order 10-15% more than your guest count.

How much cake per person?

Standard party slices are about 1x2 inches for layer cakes, or 2x2 inches for sheet cakes. Most adults eat one slice, so plan 1:1 with your guest count plus extras.

Should I order extra cake?

Yes! Order 10-15% more servings than guests. Some people take seconds, pieces break, and it's better to have leftovers than run short at a celebration.