Understanding the Mattress Firmness Scale & How to Choose the Mattress Firmness for You

Shopping for a new mattress can seem daunting, but once you understand the mattress firmness scale – a gauge of how firm each mattress is – it will be easier to choose the right mattress for you. Read on to learn about the firmness scale and how to choose the mattress firmness for your best night’s sleep.

Quick Reference: Mattress Firmness Scale

There are 10 levels on the mattress firmness scale. Although they are recommended to specific types of sleepers, they do not take personal preference into account. This is simply a guideline to help you become better informed when buying a mattress.

• Ultra-Plush: Levels 1–2 on the mattress firmness scale are the ultra-plush range. Ultra-plush mattresses are fairly uncommon due to their substantial sink and softness. Thanks to their extensive cushioning, these mattresses work best for side sleepers as they help prevent pressure points on the hips. Additionally, they are suitable for petite individuals and children who require a softer mattress, as they don't place as much pressure on the bed.

• Plush: Plush mattresses with a firmness rating of levels 3–4 provide enough softness that they contour to your body, but are sturdy enough that you won't sink too deeply. These types of mattresses are far more common and are best suited to side sleepers, petite individuals, and combination sleepers. A plush mattress is a good option for you if you want enough cushion to prevent pressure point buildup but still require some firmness.

• Medium: Medium mattress firmness levels 5–6 are ideal if you’re looking for balance. These mattresses blend the advantages of both soft and firm ratings by providing equal cushioning and support. These are best for petite individuals, combination sleepers, back sleepers, and couples due to their ability to accommodate multiple positions. They are also the most common mattresses on the market

• Firm: Increasing to levels 7–8, firm mattresses provide enough sturdiness to comfortably accommodate sleepers without much sinkage. Mattresses in this range are ideal for back sleepers and stomach sleepers who need firmness to support their lower backs and spines from sinking, plus-sized individuals who require a firmer sleeping surface, and those who suffer from back pain.

• Extra-Firm: Levels 9–10 are at the end of the mattress firmness scale. Due to the thin comfort layer and thick base layer, these are the firmest options available. These mattresses are not as common as others, but are suitable for plus-sized individuals and side sleepers who prefer the additional firmness.

How to Choose a Mattress Firmness

There are several things to consider when choosing a mattress firmness level. Factors like your sleep position, weight, and whether or not you share a bed can help you determine the correct firmness.

1. Pick Based on Your Sleeping Position

Your sleep position is the most important factor in determining the right mattress firmness level for you.

• Side Sleepers: You will need a mattress with a little more give to accommodate your hips and shoulders if you sleep on your side. We recommend selecting a mattress between levels 1–6, based on your weight and personal preferences.

• Back Sleepers: Sleeping on your back allows for even weight distribution, which means any mattress firmness is suitable.

• Stomach Sleepers: You’ll need a firmer mattress to prevent your hips from sinking and causing lower back pain if you sleep on your stomach. A mattress with a firmness level of 7–10 will offer you adequate support.

• Combination Sleepers: If you move around throughout the night, a mattress with medium firmness will support you in all positions. Levels 5–6 provide adequate support for you while on your stomach or back, but will still provide a slight give when you’re on your side.

2. Factor in Your Weight

Your weight directly translates to the amount of pressure placed on the mattress, which determines how comfortable it will feel. The average weight that mattresses are based on is between 130 lbs. and 230 lbs. Softer mattresses are best for individuals weighing less than 130 lbs., while those weighing over 230 lbs. will need a firmer mattress.

3. Consider Your Sleeping Partner

If you share a bed with someone, consider their mattress firmness needs as well as yours. Find a balance that keeps you both comfortable, especially if you have different preferences. The most customizable option is a split-king mattress, as it is large enough to accommodate two people and offers individual mattress firmnesses on each side. If this option is out of your budget or your bedroom doesn’t have enough space, a medium-firmness mattress will likely offer the best balance for both of you.

4. Know the Difference Between Firmness & Support

While mattress firmness and mattress support may seem like they are referring to the same thing, there is an important difference. Consider both firmness and support when choosing a long-lasting, quality mattress for your best night’s sleep.

• Mattress Firmness: This refers to the initial feel of the mattress when you lie on it – whether it feels soft, firm, or somewhere in between.

• Mattress Support: This has to do with what’s inside the mattress and how well it aligns your spine while you sleep.

Tip!

Options like hybrid, foam, or innerspring mattresses all provide different kinds of support – read our Mattress Buying Guide: How to Choose a Mattress for a Good Night’s Sleep for more info on choosing the mattress that provides the best kind of support for you.

Frequently Asked Questions

What firmness is best for back pain?

Firm mattresses (levels 7–8) are often recommended for those who suffer from back pain, as they provide adequate support to maintain spinal alignment. Check out our guide How to Choose the Best Mattress for Back Pain for additional tips.

What firmness is best for side sleepers?

Side sleepers typically do best with plush to medium firmness (levels 3–5) to cushion pressure points at the hips and shoulders.

What firmness is best for heavy sleepers?

Individuals over 230 lbs. generally need firm to extra-firm mattresses (levels 7–10) to prevent excessive sinking and maintain proper support.

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