How Long Does It Take for Memory Foam Mattress to Expand?

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Want to find out how long does it take for memory foam mattress to expand? This article shares you insights on what to expect & what to do with new foam mattress.

Excited? Let’s continue.

So your new memory foam mattress has already arrived at your doorstep? What now? The first thing you should do is pull the mattress out of the box and expand it. Memory foam mattresses are not readily available to use as they take some time before they fully expand. So, how long before you can sleep on your newly bought bed?

How Can I Make My Memory Foam Mattress Expand Faster?

How Long Does It Take for Memory Foam Mattress to Expand

Read the instructions before you remove the mattress from the packaging to avoid damage. After unpacking it, you will notice that the memory foam is not thick enough or appears smaller. Well, that’s because it’s not yet expanded to the original size due to packaging reasons.

Don’t worry. There are fascinating tricks you can do to help your new memory foam mattress expand faster. Whether you’re having issues with uneven corners and center, or the whole memory foam is not as thick as the original look displayed in the advertisement, here are some helpful tips to make sure you get a comfortable mattress that is worth your money:

How Long Does It Take for Memory Foam Mattress to Expand?


Typically, a new memory foam mattress takes up to 72 hours to expand. If you’re lucky, your mattress may expand in as fast as 6 hours. However, most memory foam mattresses today takes 24 hours on average to fully expand. It depends on the quality of the bed as well as the type of materials used.

According to manufacturers, memory foam mattresses may expand to 90 percent of its volume within 4 to 6 hours after unboxing. On the other hand, the mattress toppers typically take up to 24 hours before they expand 100 percent. For new memory foam pillows, you may wait between 48 and 72 hours to expand due to denser quality completely.

Does Heat Help Memory Foam Expand?

Because memory foam mattresses are made of viscoelastic, that means they are delicate and sensitive to heat. However, the advantage of viscoelasticity is that it provides memory foam the ability to get back to its original shape after use. Now, can heat help expand your memory foam mattress faster?

A warm room can assist a new mattress in expanding faster and more efficiently. Heat works by reducing viscoelasticity and increasing the fluidity of memory foam, hence spreading the mattress more quickly. It also makes the bed effortless to mold. The ideal room temperature to expand a mattress is 68 degrees Fahrenheit.

How Long Should I Let My Mattress Expand?

Most of the memory foam mattresses are not advisable to use within 24 hours after purchase or unboxing. You need to expect 24 to 48 hours for your mattress to expand to its full size and shape. It is to make sure you are covered by the warranty in case there’s damage or defects.

But what if you did not follow the standard procedure and sleep on your new memory foam mattress right away? Well, there’s nothing much to worry about if you choose to use your mattress right after taking it out of the box. When you sleep on your memory foam mattress before the 24-hour recommendation, it can help the foam expand faster.

It speeds up the expansion through body heat, which makes the foam mattress more pliable. As a result, you immediately enjoy a good night’s sleep with your newly purchased memory foam mattress. So, if you can’t wait 24 hours to sleep on your mattress, it’s perfectly safe to use it.

Why Is My Memory Foam Mattress Not Expanding?

If your new memory foam mattress is not expanding even after putting it on the floor for 24 hours, it could be due to the foam pockets. When the mattress is cramped so that it neatly fits the box, foam pockets are formed. If that’s the case, here are remarkable tips you can follow to remove the foam pockets:

Some manufacturers claim that the memory foam products they offer can expand in as quickly as 2 hours. It depends on the brand you aspire to buy and the features the product provides. However, most memory foam mattresses will take a day or two before they fully expand.

Can You Sleep on a New Mattress Straight Away?

Given the new mattress is free from any defects, it is completely safe to sleep on it straight away. Although it’s best to wait for the 24-hour expansion, some users claim their mattresses expanded faster by using them straight away. Also, there are no reported damage issues in sleeping on your new mattress before the allowed period.

Some other things to consider:

  1. The density of the memory foam: Mattresses made from higher-density foam may take longer to fully expand than those made from lower-density foam.

  2. The thickness of the mattress: A thicker mattress may take longer to fully expand than a thinner one.

  3. The temperature and humidity of the room: Memory foam is sensitive to temperature and humidity, and expanding too quickly or in the wrong environment can affect the final shape of the mattress.

  4. The type of memory foam: Different types of memory foam may have different expansion times. Some of the type can be slow-recovery foams or fast-recovery foams.

  5. The packing and compression method: Mattresses that are tightly packed and compressed may take longer to fully expand than those that are less compressed,

  6. The expectation from the manufacturer on the expansion time.

  7. The Impact of Unpacking and Storing the Mattress.

  8. Care and maintenance that can speed up or slow down the expansion process.

On the other hand, experts say that it’s always good to wait for up to 12 hours before using a new memory foam mattress. If you still have another bed to use, it would be healthy to let the off-gassing pass to avoid discomfort and unpleasant smells. Otherwise, it’s up to you whether to sleep on your mattress directly or follow the standard process before using it.

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