How Big Should Your Birthday Cake Be? Cake Size Guide for Singapore Parties

Choosing the right birthday cake size can be surprisingly tricky. A cake that is too small can leave guests disappointed, while a cake that is too large may mean too much leftover cake after the party. If you are planning a birthday celebration in Singapore, this guide will help you estimate how many people a 6 inch, 8 inch, 10 inch or tiered cake can feed.

At Bob the Baker Boy, we offer both classic cakes and customised cakes, and the serving size depends on the type of cake you choose. Classic cakes are great for simple birthday celebrations, family dinners and office cake-cutting moments, while customised cakes are better for themed parties, milestone birthdays and larger celebrations.

Birthday Cake Size Chart: How Many People Does Each Cake Feed?

Here is a simple cake size chart to help you plan. These are approximate serving estimates, as actual portions depend on how the cake is sliced, whether it is the main dessert, and whether you are serving other sweet treats alongside it.

Classic Cake Size Guide

Cake Size	Approx. People Fed	Best For
6" cake	5 to 8 people	Small family birthdays, couple celebrations, intimate gatherings
8" cake	8 to 12 people	Family parties, small office celebrations, casual birthday dinners
10" cake	15 to 20 people	Larger birthday parties, office celebrations, group gatherings

If you want a reliable birthday cake that is easy to order and suitable for most celebrations, explore our classic cakes in Singapore. Popular flavours include Signature 55% Belgian Chocolate Cake, strawberry shortcake, pandan ondeh ondeh, cookies and cream, yuzu lemon and more. You can also view our full cake flavours before deciding.

Customised Cake Size Guide

Cake Size	Approx. People Fed	Best For
6" single tier cake	6 to 10 people	Small themed birthdays, simple customised designs
8" single tier cake	15 to 20 people	Kids’ birthdays, family parties, milestone celebrations
10" single tier cake	30 to 40 people	Bigger parties, school celebrations, company events
Double tier 4" + 6"	Around 20 people	Small statement cakes, elegant birthdays, photo-worthy celebrations
Double tier 6" + 8"	Around 40 people	Medium to large birthday parties
Double tier 8" + 10"	Around 60 people	Large parties, corporate celebrations, event dessert tables
Triple tier 4" + 6" + 8"	Around 80 people	Grand birthdays, weddings, large family celebrations
Triple tier 6" + 8" + 10"	Around 100 people	Big events, corporate parties, large-scale celebrations

For themed birthday cakes, character cakes, money-pulling cakes, photo cakes or fondant designs, browse our customised cakes or submit your design through our customised cake enquiry form. This is especially useful if you already know your guest count and need help choosing the most practical cake size.

6 Inch Cake: How Many People Does It Feed?

A 6 inch cake is best for a small birthday celebration. For classic cakes, a 6 inch cake serves around 5 to 8 people. For customised cakes, a 6 inch single tier cake serves around 6 to 10 people, depending on the cake height and how it is sliced.

This size is ideal for home celebrations, small family dinners, couple birthdays, surprise deliveries and intimate gatherings. If you are planning a small birthday cake in Singapore, a 6 inch cake gives you enough for a proper cake-cutting moment without being too much.

8 Inch Cake: How Many People Does It Feed?

An 8 inch cake is one of the most versatile birthday cake sizes. A classic 8 inch cake feeds around 8 to 12 people, while an 8 inch customised cake can serve around 15 to 20 people.

This makes it a good choice for children’s birthday parties, family gatherings, office celebrations and small group events. If your guest list is around 12 to 18 people, an 8 inch customised cake is often a safer choice than a 6 inch cake, especially if the cake is the main dessert.

10 Inch Cake: How Many People Does It Feed?

A 10 inch cake works better for larger birthday parties. A 10 inch classic cake serves around 15 to 20 people, while a 10 inch customised cake can serve around 30 to 40 people.

This size is suitable for bigger family celebrations, school parties, office birthdays and group gatherings where more guests are expected. If your party has more than 20 people, you can also consider pairing a main cake with customised cupcakes, mini bites, brownies or mini tarts so guests can help themselves easily.

Should You Choose a Single Tier or Tiered Birthday Cake?

A single tier cake is usually enough for smaller or mid-sized celebrations. It is easier to cut, easier to transport and works well when you want the focus to be on flavour rather than height. A tiered cake is better when you want a more impressive centrepiece, especially for milestone birthdays, weddings, corporate parties or large family gatherings.

For example, a double tier 4 inch + 6 inch customised cake serves around 20 people, making it a good option when you want a taller, more photo-worthy cake without ordering too much. For larger parties, a 6 inch + 8 inch double tier cake serves around 40 people, while bigger double or triple tier cakes are more suitable for events with 60 to 100 guests.

How Much Cake Do You Need for 20 Guests?

For around 20 guests, choose either a 10 inch classic cake, an 8 inch customised cake, or a 4 inch + 6 inch double tier customised cake. These sizes give you enough portions for most parties without being excessive.

If the cake is the only dessert, size up slightly. If you are also serving cupcakes, brownies, mini tarts or a dessert table, you may be able to choose a smaller main cake and let the additional bakes make up the rest of the portions.

How Much Cake Do You Need for Kids’ Birthday Parties?

For kids’ birthday parties, the right cake size depends on the number of children, the number of adults and whether food is served before the cake. Children usually eat smaller portions, but adults may still want a slice, especially for 1st birthday parties where most guests are family and friends.

For a small kids’ birthday with 6 to 10 people, a 6 inch customised cake is usually enough. For 15 to 20 guests, an 8 inch customised cake is a safer choice. For larger parties, consider a bigger customised cake with customised cupcakes or mini bites for easier sharing.

You can also explore birthday cake categories by recipient, such as cakes for boys, cakes for girls, birthday cakes for him and birthday cakes for her.

When Should You Add Cupcakes, Brownies or Mini Bites?

Adding smaller bakes is a smart way to make your dessert table more flexible. They are especially helpful for office parties, school celebrations, children’s birthdays and events where guests may not want to wait for cake-cutting.

Bake Type	Approximate Size	Best For
Brownies	Approx. 2" square and 1.5" tall	Office sharing, dessert boxes, chocolate lovers
Cupcakes	Approx. 2.5"	Kids’ parties, easy serving, themed designs
Mini cupcakes	Approx. 1.5"	Young children, dessert tables, bite-sized treats
Mini bites	Approx. 4"	Parties, corporate events, mixed dessert spreads
Mini tarts	Approx. 4"	Tea breaks, dessert tables, fruit-based options
Popsicle cakes	Approx. 2"	Party favours, kids’ celebrations, fuss-free serving

If you are planning a party with mixed preferences, pair a centrepiece birthday cake with mini bites or customised cupcakes. This gives guests more variety and makes the setup feel more complete.

How to Choose the Right Birthday Cake Size

Use your guest count as the starting point, then adjust based on how the cake will be served. If cake is served after a full meal, guests may take smaller slices. If the cake is the main dessert, you should choose a larger size. For office parties, it is usually better to size up because slices are often shared with more people than expected.

You should also consider the style of cake. A classic cake is usually best when you want a straightforward birthday cake delivery in Singapore. A customised cake is better when the design matters, such as for character cakes, milestone birthdays, 1st birthdays, 21st birthdays, longevity celebrations or corporate events.

Quick Cake Size Recommendations by Guest Count

Guest Count	Recommended Cake Size	Suggested Option
5 to 8 guests	6" classic cake	Classic cake
6 to 10 guests	6" customised cake	Customised cake
8 to 12 guests	8" classic cake	Classic birthday cake
15 to 20 guests	10" classic cake or 8" customised cake	Birthday cake
20 guests	Double tier 4" + 6" customised cake	Custom cake enquiry
30 to 40 guests	10" customised cake or double tier 6" + 8"	Customised cake
60 to 100 guests	Larger double tier or triple tier cake	Request a quote

Need Help Choosing a Cake Size?

If you are still unsure, it is usually safer to choose a slightly bigger cake or add small bakes on the side. For ready-to-order celebrations, browse our birthday cakes in Singapore or classic cakes. For themed designs, tall cakes or larger parties, send us your guest count and design idea through our customised cake enquiry form, and our team will help recommend a suitable size.

Order your birthday cake online with Bob the Baker Boy and enjoy beautifully made cakes, less-sweet flavours and islandwide cake delivery in Singapore.

Frequently Asked Questions About Birthday Cake Sizes

1. What size birthday cake do I need for 10 people?

For 10 people, choose either a 6 inch customised cake or an 8 inch classic cake. If your guests enjoy cake or if the cake is the main dessert, an 8 inch cake is the safer choice.

2. How many people does a 6 inch cake feed?

A 6 inch classic cake feeds around 5 to 8 people, while a 6 inch customised cake feeds around 6 to 10 people. The final number depends on how generously the cake is sliced.

3. How many people does an 8 inch cake feed?

An 8 inch classic cake feeds around 8 to 12 people. An 8 inch customised cake feeds around 15 to 20 people because customised cakes are usually taller and more substantial.

4. How many people does a 10 inch cake feed?

A 10 inch classic cake feeds around 15 to 20 people, while a 10 inch customised cake can feed around 30 to 40 people. It is a good option for bigger birthday parties and office celebrations.

5. What cake size should I get for 20 guests?

For 20 guests, choose a 10 inch classic cake, an 8 inch customised cake, or a double tier 4 inch + 6 inch customised cake. If you are serving other desserts, you may be able to choose a smaller main cake.

6. Is a 6 inch cake enough for a birthday party?

A 6 inch cake is enough for a small birthday party of around 5 to 10 people. For larger celebrations, consider an 8 inch or 10 inch cake, or add cupcakes and mini bites for extra portions.

7. Should I order a bigger cake if I want leftovers?

Yes. If you want leftovers, size up by one cake size or add brownies, cupcakes or mini tarts. Leftover cake should be refrigerated and enjoyed as soon as possible for the best taste and texture.

8. What is the best birthday cake size for office celebrations?

For small office celebrations, an 8 inch classic cake is usually enough. For bigger teams, choose a 10 inch cake or pair the main cake with cupcakes, brownies or mini bites for easier sharing.

9. Are customised cakes better for large parties?

Customised cakes are often better for large parties because they come in taller single-tier, double-tier and triple-tier options. They also work well when you need a cake that matches a specific birthday theme.

10. Can I mix a smaller cake with cupcakes or mini bites?

Yes. This is a practical option for birthday parties, school celebrations and office events. A smaller centrepiece cake gives you the cake-cutting moment, while cupcakes, brownies or mini bites make serving easier.