The basic difference: width, not length

In commonly published South African size guides, a standard single mattress is about 91 cm wide by 188 cm long, while a standard three-quarter mattress is about 107 cm wide by 188 cm long. In other words, the usual three-quarter option gives you roughly 16 cm more width while keeping the same standard length. [1] [2] [3]

That extra width can make a noticeable difference when you sleep alone, turn often or use the bed for more than one person occasionally. It is still a one-person size for everyday planning, though, rather than a substitute for a double or larger mattress. Treat the measurements as a starting point and measure the actual mattress, base and room because labels and product ranges can vary.

  • Single: check for approximately 91 cm × 188 cm in the standard format.
  • Three-quarter: check for approximately 107 cm × 188 cm in the standard format.
  • Do not assume the base, mattress and fitted sheet will share identical outside measurements.

When a single mattress is the better fit

A single mattress is the more space-efficient choice for a child’s room, compact flat, bunk or loft arrangement, or a guest room that needs to retain floor space. South African bed guides commonly position it for one sleeper and smaller bedrooms. [2] [3] The narrower footprint may also make it easier to leave usable clearance for cupboards, desks and doors.

Choose it when the sleeper is comfortable with a narrower surface and the room layout matters more than having spare elbow room. If the person is tall, remember that standard length is not the only option: some South African guides list extra-length single mattresses at about 200 cm, but availability and compatibility should be confirmed before buying. [3]

  • Measure door swings, cupboards and walking routes before prioritising the smallest footprint.
  • For a growing child, check whether the current width and length will remain practical for the expected use.
  • If height is a concern, compare standard and extra-length options rather than guessing from the label.

When three-quarter gives useful breathing room

A three-quarter mattress is a sensible middle ground when a single feels restrictive but a double would take too much room. The extra 16 cm of width can help a teenager, student or adult sleeper who wants more room to move without changing the standard 188 cm length. South African retailers commonly describe the size as suitable for young adults and smaller rooms. [2] [3]

The trade-off is that the wider mattress needs matching support and linen, and it may leave less space for other furniture. Before deciding, compare the full footprint of the base—not just the mattress—and browse the wider range of sizes on [MattressCompare.co.za](/mattresses) to keep the decision focused on fit, construction and intended use rather than a size name alone.

  • Use the extra width to improve solo comfort, not to plan regular adult couple sleeping.
  • Confirm that a three-quarter fitted sheet and protector are available in the exact dimensions you need.
  • Check that the frame’s internal dimensions support the mattress without gaps or overhang.

A simple decision checklist before you buy

Start with the sleeper and the room together. Measure the available floor area, then mark the proposed mattress footprint with tape or newspaper. Include the base, headboard and any drawers in your plan. Leave enough room to get in and out of bed and to open nearby furniture; a mattress that fits on paper can still make the room awkward in daily use.

Next, verify the practical details with the seller or manufacturer: exact width and length, whether the mattress is standard or extra length, the compatible base, maximum supported load if stated, and the return or exchange terms. For persistent pain, numbness or other symptoms, do not treat mattress size as a diagnosis or cure; speak with a qualified health professional.

  • Measure the existing frame’s inside width and length before ordering a replacement mattress.
  • Confirm linen, protector and base compatibility in writing where dimensions are unclear.
  • If comfort remains poor or symptoms persist, seek professional health advice rather than relying on a mattress change alone.