Single Mattresses

What size is a single mattress?

All of our single mattresses measure 3' x 6'3" (90cm x 190cm) - also known as 3ft single bed mattresses - making them ideal for kids, teens, solo sleepers and spare rooms.

Can an adult sleep on a single mattress?

Yes, our Head of Sleep Science confirms that single mattresses can comfortably support most adults. But if you're over 6ft, we recommend upgrading to a king size for extra length to stretch out and sleep comfortably.

What firmness options are available for single mattresses?

We stock single mattresses in every firmness level to suit your sleep style. Take a look at what our Head of Sleep Science recommends for your sleep need:

• Soft-medium - gentle cushioning
• Medium - balanced support for most sleepers
• Medium-firm - versatile support with a slightly firmer feel
• Firm - ideal for back sleepers
• Extra firm – our firmest feel

Not sure which firmness is right for you? Read our guide to mattress firmness for help choosing your best match.

Why buy your single mattress from MattressOnline?

We're mattress specialists, not a general furniture shop, and we've been helping the UK sleep better for over 20 years now.

• Expert access: Expert help when you want it, from our Sleep Experts and Head of Sleep Science.
• Global and UK brands: We stock over 40 trusted brands, including Which? Best Buy and Good Housekeeping award winners.
• Award-winning service: Free next day delivery, a 100-Night Sleep Trial, and old mattress recycling if you need it, brought to you by seven-time National Bed Federation award winners.

How much should I spend on a single mattress?

At MattressOnline, our Sleep Experts know that price matters. Our single mattresses range from around £140 to £1,500+, depending on the brand and materials.

• Budget: from £140 - great value for spare rooms or growing teens
• Mid-range: £200-£300 - ideal for everyday comfort and support
• Premium: £600-£1,500+ - handcrafted luxury from the UK’s best brands

Whatever your budget, we’ve got good quality single mattresses ready to deliver as soon as tomorrow.

Which is the cheapest single mattress?

Our cheapest single mattresses start from just £140 or less, and with our regular single mattress sales, you’ll often find even more great deals.

Our teams and Sleep Experts work directly with trusted UK brands like Silentnight, Sealy, and SleepSoul to bring you the best price on quality single mattresses - without compromising on comfort or service.

Whether you’re after a spare room essential or a single bed mattress for everyday use, we’ve got the best price options in stock and ready to ship.

Do you offer next day delivery on single mattresses?

Yes, order your single mattress before 4pm for free next day delivery across most of the UK.

• Delivery 7 days a week
• Choose your preferred delivery date at checkout
• Handled by our expert local or national teams

We’ve delivered over 800,000 mattresses across the UK - so you can rest easy with MattressOnline.

Learn more about our delivery options on our Delivery page.