When you start shopping for a mattress, you will quickly notice that sizes are listed in different units depending on where you are looking. Some listings show centimetres. Others show feet or inches. If you are switching between product pages and room measurements, it can get confusing fast.
This guide lays out all the standard mattress sizes in feet, explains what each size is genuinely suited for, and helps you figure out which one makes sense for your home and the way you sleep.
Why Mattress Sizes Are Listed in Different Units
In Singapore, mattress dimensions are most commonly listed in centimetres, particularly in local stores and on product pages. However, many shoppers still think in feet, especially if they are used to property listings, renovation guides, or furniture shopping where feet and inches are commonly used.
Neither unit is more accurate than the other. What matters is that you are working with consistent measurements when comparing your room size to a mattress size. Throughout this guide, sizes are given in feet alongside their centimetre equivalents so you can use whichever feels more natural to you.
Standard Mattress Sizes in Feet
Here is a clear breakdown of every size you are likely to encounter when shopping in Singapore.
Single: approximately 3 ft x 6 ft 3 in (91 cm x 190 cm) The single is the smallest standard mattress size and is well suited to children's bedrooms, study rooms, or guest rooms where space is limited. It fits neatly into most compact rooms without overwhelming the layout.
Super Single: approximately 3 ft 6 in x 6 ft 3 in (107 cm x 190 cm) The super single is one of the most popular sizes among Singapore shoppers, particularly for adults sleeping alone. It is noticeably wider than a standard single, giving you more freedom to move during the night without taking up the same floor space as a double or queen. It works well in HDB bedrooms and is a practical choice for those who want personal sleeping space without a large footprint.
Double (Full): approximately 4 ft 6 in x 6 ft 3 in (137 cm x 190 cm) A double mattress can accommodate two sleepers, though the space per person is modest. It suits couples in smaller rooms or single sleepers who prefer a wider surface. If you are sharing with a partner on a regular basis, a queen will generally feel more comfortable for both of you.
Queen: approximately 5 ft x 6 ft 3 in (152 cm x 190 cm) The queen is the most widely chosen size for couples in Singapore. It offers a meaningful amount of personal space for two people while fitting comfortably in most standard master bedrooms. If you are upgrading from a super single or double, the queen is often the most balanced step forward.
King: approximately 6 ft x 6 ft 3 in (183 cm x 190 cm) A king mattress gives two sleepers generous personal space and is a strong choice for those who move around during the night or share the bed with a child occasionally. It suits landed homes and larger condo bedrooms well. Before choosing a king, measure your room and allow for at least 60 to 90 centimetres of clearance on each accessible side of the bed.
Super King: approximately 6 ft x 6 ft 7 in (183 cm x 200 cm) The super king shares the same width as a standard king but adds an extra 10 centimetres in length. That additional length makes a real difference for taller sleepers who want full-body support without their feet reaching the edge. It is best suited to spacious master bedrooms in condos and landed properties.
Translating Feet to Centimetres: A Quick Reference
If you are measuring your room in feet but your mattress size is listed in centimetres, or the other way around, here is a simple reference:
1 foot is approximately 30.5 centimetres. So a queen mattress at roughly 5 ft x 6 ft 3 in translates to 152 cm x 190 cm.
The easiest approach is to measure your room in centimetres using a tape measure and then compare directly against the centimetre dimensions listed on any product page. This removes the risk of small conversion errors leading to a poor fit.
How to Choose the Right Size for Your Home
Getting the size right is the most important decision you will make when buying a mattress. A mattress that is too small will leave you feeling restricted. One that is too large for the room creates a cramped layout that does not contribute to restful surroundings.
For solo sleepers, the super single is worth serious consideration. It gives you noticeably more room than a standard single and suits the typical dimensions of an HDB bedroom without taking over the space.
For couples, the queen is the natural starting point for most Singapore homes. If your bedroom is spacious and undisturbed sleep is a priority, a king offers meaningful gains in comfort. The wider surface means that when one person shifts position, the other is far less likely to notice.
For taller sleepers, length matters as much as width. Anyone over 180 centimetres should look closely at the super king, which provides an extra 10 centimetres of length over the standard king and queen. Sleeping with your feet fully supported rather than hanging over the edge makes a genuine difference to how rested you feel in the morning.
For families, if young children sometimes join you in bed, a king or super king makes those moments far more comfortable for everyone involved.
Size and Mattress Type Work Together
Once you have settled on a size, the type of mattress you choose determines how well it performs over time, particularly in Singapore's warm and humid climate.
A latex mattress is naturally breathable and resilient, which makes it a practical choice for warmer nights. Memory foam offers excellent contouring and pressure relief, though it is worth looking for options with good airflow construction to manage heat across a larger sleeping surface.
For couples sharing a queen or king, motion isolation is worth prioritising. A pocketed spring mattress uses individually wrapped coils that respond independently, meaning your sleep is less disrupted by your partner's movements. This works particularly well on larger mattress sizes where each person has their own zone of the sleeping surface.
You can explore the full range across sizes and materials in the Somnuz mattress collection.
A Note on Bed Frames and Sizing Compatibility
One thing many shoppers overlook is whether their existing bed frame will work with a new mattress size. Bed frames are built to specific dimensions, and a mattress that is even a few centimetres wider or longer than the frame can affect support and fit.
If you are buying a new mattress and keeping your current frame, measure the interior of the frame carefully before ordering. If you are replacing both, it is much simpler as you can choose a frame designed for the exact size you want.
For those considering an upgrade to a more flexible sleeping setup, it is also worth knowing that adjustable beds are available in select sizes. These are particularly useful for sleepers who prefer different positions throughout the night.
Try Before You Decide
Buying a mattress online is convenient, but it is a considered purchase and many people find it helpful to feel the difference between sizes and materials in person before committing.
At our mattress showroom in Singapore, you can try the range in person, take your time, and ask questions without any pressure. Our team is there to help you work through the options based on your room size, your sleep preferences, and your household.
If you would like to read more about creating a genuinely restful sleep environment, our Sleep Well guide offers practical, honest advice to help you sleep better night after night.
FAQs
What is a standard mattress size in feet for a Singapore HDB bedroom?
For an HDB master bedroom, the queen size at approximately 5 ft x 6 ft 3 in (152 cm x 190 cm) is the most practical and popular choice. It fits comfortably with sufficient clearance around the bed. For smaller rooms, the super single at 3 ft 6 in x 6 ft 3 in is a well-suited alternative.
Is a king size mattress 6 feet wide?
Yes, a standard king mattress is approximately 6 ft wide (183 cm). A super king shares the same width but adds extra length, measuring approximately 6 ft x 6 ft 7 in (183 cm x 200 cm).
How does a super single differ from a double in feet?
A super single is approximately 3 ft 6 in wide, while a double is approximately 4 ft 6 in wide. The double is a full foot wider, making it a better fit for two people sharing, though a queen remains the more comfortable option for regular couple use.
Can I use feet to measure my bedroom for a mattress?
You can, though it is easier to work in centimetres when comparing against mattress dimensions listed on product pages. If you measure in feet, multiply by 30.5 to convert to centimetres before comparing.
What mattress size works for taller sleepers?
f you are over 180 cm (approximately 5 ft 11 in), consider the super king, which offers a length of about 6 ft 7 in (200 cm). This gives taller sleepers full-body support without feeling restricted at the foot of the bed.
Does a larger mattress mean better sleep?
Not automatically. The right size is the one that suits your room, your sleep style, and who you are sharing the bed with. A well-chosen queen on a solid, breathable mattress will serve a couple far better than an oversized super king in a room that cannot accommodate it properly.
Find the Right Fit for Your Bedroom
Whether you are measuring in feet or centimetres, the goal is the same: a mattress that fits your room, supports your sleep, and feels right for your household.
Browse the Somnuz mattress collection to compare sizes and materials, or visit our showroom to try the range in person. We are here to help you find what works, without the guesswork.