How Long Does Float Cake Last?

If you’re a fan of Japanese cuisine, you’ve probably heard of Float Cake. It’s a type of dessert that’s also known as Mizu Shingen Mochi, and it’s been gaining popularity in recent years.

This unique dessert is made of water, sugar, and agar-agar powder, which gives it its distinctive texture. But one question that often comes up is, how long does Float Cake last? In this article, we’ll explore the shelf life of this delicate dessert and provide some tips on how to store it properly.

Float Cake
Float Cake

What is Float Cake?

Float Cake is a Japanese dessert that’s known for its unique texture and appearance. It’s also called Mizu Shingen Mochi, which means “water cake.”

This dessert is made of water, sugar, and agar-agar powder, which is a vegetarian substitute for gelatin. It’s often served with sweet syrup and kinako powder, which is roasted soybean flour.

How is Float Cake Made?

Making Float Cake requires some precision and technique. The ingredients are mixed together and then poured into a mold that’s shaped like a dome.

The mold is then placed in the fridge to set. When the dessert is ready, it’s carefully removed from the mold and placed in a bowl. It’s important to handle Float Cake delicately, as it’s very fragile and can easily break apart.

The Shelf Life of Float Cake

Float Cake has a very short shelf life and is best consumed within a few hours of being made. It’s a delicate dessert that’s highly perishable, and it can quickly lose its shape and texture if left out at room temperature.

The ideal temperature for Float Cake is between 40 and 50 degrees Fahrenheit, so it’s important to keep it in the fridge until you’re ready to serve it.

How to Store Float Cake Properly

If you have leftover Float Cake, it’s important to store it properly to ensure that it stays fresh for as long as possible. The best way to store Float Cake is to keep it in an airtight container in the fridge.

You should also wrap the container in a damp towel to help prevent the cake from drying out. Float Cake should be consumed within 2-3 days of being made.

Signs of Spoilage

Like all perishable foods, Float Cake can spoil if not stored properly. If you notice any of the following signs, it’s best to discard the dessert:

Can You Freeze Float Cake?

While it’s possible to freeze Float Cake, it’s not recommended. The texture of the cake will change when it’s frozen, and it may not be as enjoyable to eat.

If you have leftover Float Cake that you don’t think you’ll be able to consume within 2-3 days, it’s best to share it with friends or family.

Tips for Serving Float Cake

When serving Float Cake, it’s important to handle it delicately. Use a

serrated knife to cut the cake into small pieces, and serve it on a plate with sweet syrup and kinako powder.

It’s also common to add fruit, such as strawberries or mango, to the dish for added flavor and texture. Float Cake is best enjoyed chilled, so be sure to keep it in the fridge until you’re ready to serve.

What to Do with Leftover Float Cake

If you have leftover Float Cake that you’re not able to finish within 2-3 days, there are a few things you can do with it. One option is to add it to a smoothie or milkshake for added texture and flavor.

You could also crumble it up and use it as a topping for ice cream or yogurt. Another idea is to use it as a base for a fruit salad or parfait.

How to Make Float Cake at Home

If you’re feeling adventurous, you can try making Float Cake at home. Here’s a simple recipe to get you started:


  • 1 cup water
  • 1/4 cup sugar
  • 1/4 teaspoon agar-agar powder
  • Sweet syrup, for serving
  • Kinako powder, for serving
  • Fruit, optional


  1. In a saucepan, combine the water and sugar. Heat over medium heat until the sugar has dissolved.
  2. Add the agar-agar powder and stir until it’s fully dissolved.
  3. Remove the mixture from the heat and let it cool for 5-10 minutes.
  4. Pour the mixture into a dome-shaped mold and refrigerate for 2-3 hours, or until the cake has set.
  5. Carefully remove the cake from the mold and place it in a bowl.
  6. Serve with sweet syrup, kinako powder, and fruit, if desired.


What is the texture of Float Cake?

Float Cake has a delicate and jelly-like texture. It’s soft and smooth, but also slightly firm,

Can you add flavorings to Float Cake?

Yes, you can add flavorings to Float Cake. Some common flavorings include matcha powder, fruit juice, and coffee.

Is Float Cake gluten-free?

Yes, Float Cake is gluten-free, as it’s made with agar-agar powder instead of gelatin.

Is Float Cake vegan-friendly?

Yes, Float Cake is vegan-friendly, as it’s made with agar-agar powder instead of gelatin.

What are some common toppings for Float Cake?

Some common toppings for Float Cake include sweet syrup, kinako powder, and fruit. Some people also like to add condensed milk or whipped cream.


Float Cake is a delicious and unique dessert that’s popular in Japan and other parts of Asia. It’s made with agar-agar powder, which gives it a delicate and jelly-like texture, and it’s often served with sweet syrup and kinako powder. While Float Cake can last for 2-3 days in the fridge, it’s best enjoyed chilled and fresh.

If you’re feeling adventurous, you can try making Float Cake at home with a few simple ingredients and a dome-shaped mold. Overall, Float Cake is a fun and tasty dessert that’s sure to impress your friends and family.

I'm Jennifer Tirrell, a self-taught baker, and founder of CakeRe. As an experienced baker and recipe publisher, I have spent over a decade working in the kitchen and have tried and tested countless baking tools and products. From classic cakes to creative twists, I've got you covered. So grab your apron and let's get baking!

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