Mattress Replacement Calculator: Is It Time for a New Mattress?

When Should You Replace Your Mattress?

The standard UK guidance from Bed Advice UK (the consumer arm of the National Bed Federation) is to replace your mattress roughly every seven to eight years.¹ Most people wait far longer. It’s not unusual for a mattress to stay in service for 12 or 15 years, and by that point the materials inside have broken down enough to affect your sleep without you necessarily realising it.

That seven-to-eight-year figure isn’t arbitrary. It reflects how mattress materials degrade under nightly use. Foam loses its density. Springs fatigue and lose tension. The comfort layers that felt supportive on day one gradually compress and flatten out. None of this happens overnight, which is exactly why it’s so easy to miss. You don’t wake up one morning on a suddenly terrible mattress. It declines gradually, and your body adjusts. You get used to the slight dip in the middle or the springs you can feel through the cover, and what was once a good night’s sleep quietly becomes a mediocre one.

Research supports the idea that replacing an old mattress makes a noticeable difference even when you didn’t think your old one was a problem. A study at Oklahoma State University found that people who swapped mattresses older than five years for new medium-firm beds reported less back pain, better sleep quality, and lower stress within four weeks.⁴ Many of them hadn’t been actively complaining about their old mattress beforehand, which suggests quite a few of us have simply adapted to sleeping surfaces that aren’t doing much for us any more.

The quiz above helps you assess where your mattress stands right now. But as a rough guide: if yours is over seven years old, it’s worth an honest evaluation. If it’s over ten, the question probably isn’t whether to replace it, but when.

7 Signs Your Mattress Needs Replacing

Mattresses rarely fail all at once. They wear out gradually, and the signs can be easy to dismiss or attribute to something else. Here are seven things worth checking.

1. Visible Sagging or Body Impressions

If you can see a dip where you usually sleep, that’s the clearest sign. In spring mattresses, sagging typically means the coils have lost tension. In foam mattresses, it means the material has compressed past the point of recovery. Either way, your spine is no longer being held in a neutral position while you sleep, and the mattress won’t bounce back no matter how long you leave it empty. A sag of more than two to three centimetres is generally the point where you’ll start noticing it in your back.

2. Decreased Comfort and Support

Think back to when your mattress was new. If you remember it feeling noticeably better, that’s not nostalgia. Comfort layers (the soft top section of the mattress) break down faster than the support core underneath, so you can lose surface comfort while the mattress still looks structurally fine. If you find yourself shifting position more often during the night or struggling to get comfortable, the upper layers have probably thinned out.

3. Morning Aches, Stiffness, or Pain

Waking up stiff isn’t inevitable. If you’re regularly achy first thing but the pain fades within 30 to 60 minutes of getting up, that pattern points towards your mattress rather than a medical issue.⁸ A mattress that’s lost its support forces your body to compensate overnight, and you feel the results in your lower back, shoulders, or hips the next morning. One study found that switching to a properly supportive mattress reduced morning back pain and stiffness within the first month.³

4. Creaking, Squeaking, or Movement Transfer

Noisy springs are worn springs. If your mattress creaks when you roll over, or your partner’s movements wake you up more than they used to, the internal structure is losing its integrity. In pocket sprung mattresses, this usually means individual spring casings have torn and the springs are rubbing against each other. In open coil models, the whole interconnected spring unit can start to flex unevenly. Neither is going to improve on its own.

5. Sleeping Better Elsewhere

Consistently sleeping better in hotels or other beds is one of the most reliable indicators that your mattress has a problem. Hotel mattresses aren’t magic. They’re just newer. If you come back from a trip feeling more rested than usual, pay attention to that. Your mattress at home may have declined to the point where you’ve stopped noticing, but your body still registers the difference when it gets something better.

6. Allergies, Stains, or Hygiene Concerns

Over time, mattresses accumulate dead skin cells, moisture, and dust mite allergens. Allergy UK notes that dust mite droppings are a common trigger for allergic rhinitis, eczema, and asthma symptoms, and that mattresses are one of the primary breeding grounds.⁷ If you’ve noticed more sneezing at night, congestion in the morning, or visible staining and odour that cleaning can’t shift, the mattress may be past the point where protector covers and regular washing can help.

7. Changed Circumstances

The mattress that suited you five years ago might not suit you now. Weight changes, a new sleeping partner, pregnancy, surgery, a shift in sleeping position, or a condition like arthritis can all change what you need from your mattress. A mattress isn’t a one-time purchase for life. If your body or your circumstances have changed meaningfully since you bought it, it’s worth reconsidering whether it still fits.

How Long Do Different Mattress Types Last?

Not all mattresses age at the same rate. The materials inside, the construction quality, and how the mattress is used all make a difference. The table below gives general lifespan ranges, but it’s worth understanding what drives the numbers.

Open coil mattresses use a single interconnected spring unit. They’re the most affordable option but also the least durable, because stress on one part of the spring system affects the rest. Sagging tends to appear within five to seven years, often sooner for heavier sleepers or couples.

Pocket sprung mattresses hold up better because each spring sits in its own fabric pocket and moves independently. You’ll get seven to eight years from a good pocket sprung mattress, sometimes more if the spring count is high and the comfort layers are well-made.

Memory foam mattresses generally last eight to ten years. High-density foam holds its shape longer than low-density alternatives, so cheaper memory foam mattresses often wear out faster despite being the same type. Heat retention can also accelerate foam breakdown in models without adequate airflow.

Hybrid mattresses combine springs with foam or latex layers. They tend to last seven to nine years, though durability depends heavily on the quality of both components. A hybrid with thin foam layers over basic springs won’t outlast a well-made pocket sprung.

Latex is the most durable mattress material. Natural latex, in particular, can last 10 to 15 years before showing meaningful wear. It’s naturally resistant to dust mites and mould, retains its shape well, and degrades slowly. The trade-off is a higher upfront cost, though the longer lifespan often makes it better value per year.

These lifespans assume reasonable care: a supportive base, a mattress protector, and regular rotation. Bed Advice UK recommends reviewing your mattress condition from the seven-year mark, whatever the type.¹

How to Make Your Mattress Last Longer

You can’t stop a mattress from wearing out, but a few habits will slow it down noticeably.

Use a mattress protector from day one. A waterproof, breathable protector keeps moisture, skin cells, and spills out of the mattress interior. This matters more than most people think, because moisture accelerates foam breakdown and creates a friendlier environment for dust mites.⁷ A decent protector costs a fraction of a new mattress and can add years to its useful life.

Rotate your mattress regularly. Turning it 180 degrees (head to foot) every three to six months distributes wear more evenly and helps prevent body impressions from forming in one spot. Most modern mattresses are single-sided, so you won’t flip it, but rotating still makes a difference.

Make sure the base is right. A mattress needs proper support underneath. Sprung bases pair well with sprung mattresses. Solid or slatted platform bases suit foam and latex. Using the wrong base, or one that’s sagging or broken, puts uneven stress on the mattress and shortens its life. If your bed frame uses slats, check that they’re evenly spaced and none are cracked or bowing.

Keep it clean and dry. Strip the bed regularly, let the mattress breathe for a few minutes before remaking it, and air the bedroom with an open window when you can. Allergy UK recommends washing sheets at 60 degrees to kill dust mites, and pulling back the duvet each morning to let moisture escape.⁷

Don’t let children use it as a trampoline. This sounds obvious, but repeated bouncing concentrates force in ways the mattress wasn’t designed to handle. It’ll damage the springs or foam core faster than years of normal sleeping would.

How to Choose Your Next Mattress

If the quiz suggests it’s time to replace, you don’t need to rush the decision. A mattress is something you’ll use for seven or eight hours a night over the next seven to eight years, so it’s worth getting right.

Start with firmness. A randomised trial published in The Lancet found that medium-firm mattresses produced better outcomes for back pain than firm ones,⁵ and a 2015 systematic review concluded that medium-firm with some ability to self-adjust is the best-supported option across the research.⁶ But individual comfort still matters. Someone who weighs 60kg and sleeps on their side will need a different feel from someone who weighs 100kg and sleeps on their back.

Think about your sleeping position. Side sleepers generally need a softer surface to cushion the shoulders and hips. Back sleepers do better with medium-firm support. Stomach sleepers need something firmer to prevent the hips from sinking too far.

Consider temperature. If you tend to sleep hot, look at pocket-sprung models with natural fillings, or latex, which breathes better than most memory foam. Some hybrid and foam mattresses now include gel or graphite layers to help with heat, but the effect varies.

Set a realistic budget. A decent double mattress in the UK starts at around £300 to £400, with good-quality options in the £500 to £800 range. Spending more gets you premium materials and longer expected lifespans, but there are diminishing returns above £1,000 unless you have specific requirements. You can use our cost-per-night calculator to compare value across different price points.

Browse our mattress reviews for expert assessments across all budgets, take our 60-second mattress quiz for personalised recommendations, or check our top-rated picks if you want a shortlist.

What Your Replacement Score Means

Your total score is the sum of eight individual ratings, each assessing a different aspect of your mattress condition. Scores closer to 40 indicate a mattress in good shape across all areas. Scores closer to 8 suggest problems in most categories.

• Your Mattress Is Fine (31 to 40): No action needed. Your mattress is still providing the support and comfort it should. Check back in six to twelve months, or sooner if something changes.
• Keep an Eye on It (23 to 30): Your mattress is showing some early signs of wear, but replacement isn’t urgent yet. Monitor the areas that scored lowest and revisit the quiz in a few months.
• Start Shopping Soon (16 to 22): Your mattress has noticeable issues in several areas. It may still be functional, but it’s likely affecting your sleep quality. Start researching options so you’re ready when the time comes.
• Time for a New Mattress (8 to 15): Multiple aspects of your mattress are scoring poorly, and it’s almost certainly affecting your sleep. Replacing it should be a priority. Browse our mattress reviews or take our mattress quiz to find a good fit.

Look at your individual category scores in the breakdown above to see exactly which areas are pulling your total down. If one or two categories are driving a low score while the rest are fine, targeted fixes (like a mattress topper or protector) might buy you some time. If most categories are sitting at 2 or below, the mattress is past the point of patching up.