Choosing the right mattress size is just as important as choosing the right level of comfort and support. A mattress that is too small may leave you feeling cramped, while one that is too large may take up valuable bedroom space.
If you're shopping for a new mattress in Ireland, understanding standard mattress dimensions can help you make the right choice.
In this guide, we'll explain the most common mattress sizes in Ireland, how to choose the best size for your bedroom, and what to check before placing your order.
1. What Are the Standard Mattress Sizes in Ireland?
Mattress dimensions in Ireland can differ from those used in other countries, so it's important to check measurements rather than relying on the name alone.
Here are the common Irish mattress sizes:
| Mattress Size | Typical Dimensions |
|---|---|
| Single | 90 × 190 cm |
| Small Double | 120 × 190 cm |
| Double | 135 × 190 cm |
| King | 150 × 200 cm |
| Super King | 180 × 200 cm |
Always check the exact dimensions listed for your chosen mattress, as individual products and bed frames may vary.
2. Single Mattress: Ideal for Smaller Spaces
A single mattress typically measures 90 × 190 cm.
It's a practical option for children's bedrooms, guest rooms, student accommodation and smaller bedrooms.
A single mattress can also be a good choice when furnishing a spare room where making the most of available floor space is important.
A single mattress may suit you if:
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You're furnishing a child's or teenager's bedroom.
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You need a practical guest bed.
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You have limited bedroom space.
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You're looking for a compact, everyday sleeping solution.
3. Small Double Mattress: Extra Space Without a Large Footprint
A small double mattress typically measures 120 × 190 cm.
It offers more sleeping space than a single mattress without taking up as much room as a standard double.
This size can work well in smaller bedrooms, studio apartments or guest rooms where space is limited. It may also suit one adult who prefers extra room to move during the night.
For two adults, however, a small double can feel restrictive, particularly if either person moves around frequently while sleeping.
4. Double Mattress: A Popular Choice for Everyday Comfort
A standard double mattress typically measures 135 × 190 cm.
It provides a comfortable sleeping area for one adult and can accommodate two adults who are happy sharing a more compact sleeping space.
Double mattresses are often chosen for bedrooms where balancing sleeping comfort with available floor space is a priority.
Before choosing a double mattress for two people, consider your individual sleeping habits and how much room you prefer to have at night.
5. King Size Mattress: More Room to Stretch Out
A king size mattress typically measures 150 × 200 cm.
Compared with a standard double, it offers additional width and length, making it an attractive option for couples who want more room to sleep comfortably.
The extra space can be especially useful if one or both sleepers tend to change positions during the night.
A king size mattress is worth considering if you have a reasonably spacious bedroom and want to upgrade from a double.
Before ordering, measure your bed frame and check that the mattress dimensions match.
6. Super King Mattress: Spacious Comfort for Couples
A super king mattress typically measures 180 × 200 cm.
It provides considerably more width than a standard double, making it a popular option for couples who value personal sleeping space.
A super king can also be worth considering for larger bedrooms or households that occasionally share the bed with children or pets.
However, remember to account for bedside tables, wardrobes, doors and walking space when planning your bedroom layout.
7. How Do You Choose the Right Mattress Size?
The right mattress size depends on more than the number of people using it.
Consider Your Bedroom Size
Measure the available floor space before purchasing a mattress. Leave enough room to walk around the bed, open wardrobes and access bedside tables comfortably.
Think About Who Will Use the Bed
A single mattress may be sufficient for one person, while couples may prefer the additional room offered by a king or super king.
Your height, sleeping habits and preference for personal space can also influence your decision.
Check Your Existing Bed Frame
Never assume that a mattress will fit simply because it carries the same size name as your bed frame.
Measure the frame's internal dimensions and compare them with the mattress specifications. A mattress that is too large or too small may not sit correctly on the base.
Consider Your Budget
Larger mattresses generally require larger bedding and may cost more than smaller alternatives. Consider the complete setup, including sheets, mattress protectors and suitable bed bases.
Choosing the right size means finding a balance between comfort, available space and budget.
8. Does Mattress Size Affect Sleep Comfort?
Mattress size can influence how comfortably you sleep, particularly if you share a bed.
Having enough space to change positions without disturbing your partner can make a difference to your overall sleeping experience.
However, size is only one factor to consider. Mattress firmness, construction and comfort layers are also important.
For example, pocket spring mattresses use individually enclosed springs that respond independently to pressure. Hybrid mattresses combine spring support with comfort layers, while memory foam mattresses offer a more contouring feel.
Choosing a suitable size alongside the right mattress construction can help you create a more comfortable sleeping environment.
9. Find Your Mattress Size at iSleep Ireland
At iSleep, we offer mattresses in different sizes and constructions to suit a variety of bedrooms and sleeping preferences.
Whether you're furnishing a guest room, upgrading your double mattress or looking for more space with a king or super king, comparing the available dimensions is a good first step.
Before ordering, check the product specifications, confirm your bed frame measurements and consider which mattress style best suits your comfort preferences.
Ready to find your next mattress?
Explore the iSleep mattress collection to compare available sizes, comfort levels and mattress types.
Frequently Asked Questions
What is the most common mattress size in Ireland?
Double mattresses are a common choice for couples and individual adults, while single mattresses are widely used in children's bedrooms and guest rooms. The best size depends on the room and the sleeper's needs.
What size is a king mattress in Ireland?
A typical Irish king size mattress measures 150 × 200 cm. Always check the dimensions of the specific product before purchasing.
What is the difference between a double and a king mattress?
A typical double measures 135 × 190 cm, while a king measures 150 × 200 cm. A king therefore provides additional width and length.
Is a small double big enough for two adults?
It can accommodate two adults, but the available sleeping space is relatively limited. Couples who prefer more room may find a double, king or super king more comfortable.
Should I measure my bed frame before buying a mattress?
Yes. Measure the internal dimensions of your bed frame and compare them with the mattress specifications. This helps ensure a suitable fit.
