A standard twin bed is typically about 38 inches wide by 75 inches long (around 96.5 cm by 190.5 cm).

Quick Scoop: Twin Bed Size

  • Standard twin mattress: about 38" wide × 75" long.
  • In centimeters: roughly 97 cm × 191 cm.
  • Twin XL (if you’re curious): same width (38") but 80" long, for taller sleepers.
  • Typical twin bed frame: usually a few inches bigger, around 40–43" wide and 77–82" long, to fit the mattress and structure.

Mini Sections

Ideal for whom?

  • Children and most teenagers.
  • Single adults under about 6 feet tall or who don’t mind less legroom.
  • Small bedrooms, guest rooms, or dorms where floor space matters.

Room size guideline

  • Common recommendation: at least about 7 ft × 10 ft of room space for a twin setup so you still have walking and furniture space.

Quick HTML size table

html

<table>
  <thead>
    <tr>
      <th>Type</th>
      <th>Dimensions (inches)</th>
      <th>Dimensions (cm)</th>
      <th>Notes</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Standard Twin Bed</td>
      <td>38&quot; × 75&quot;</td>
      <td>97 × 191</td>
      <td>Smallest standard bed size; for one sleeper</td>
    </tr>
    <tr>
      <td>Twin XL Bed</td>
      <td>38&quot; × 80&quot;</td>
      <td>97 × 203</td>
      <td>Same width, 5&quot; longer; popular in dorms</td>
    </tr>
    <tr>
      <td>Typical Twin Frame</td>
      <td>≈ 40–43&quot; × 77–82&quot;</td>
      <td>≈ 102–109 × 196–208</td>
      <td>Frame adds a bit of extra width and length</td>
    </tr>
  </tbody>
</table>

TL;DR: If you’re asking “what size is a twin bed,” think roughly 38" × 75" for the mattress; check the frame specs too, since it will be slightly larger in your room.

Information gathered from public forums or data available on the internet and portrayed here.