A standard twin blanket is usually about 65–66 inches wide by 90 inches long (roughly 165–168 cm by 229 cm).

Quick Scoop: Twin Blanket Size

For a typical twin bed:

  • Twin mattress: about 38" x 75".
  • Twin blanket: about 65–66" x 90" so it can hang over the sides and foot of the bed for tucking in and full coverage.

Some brands list a small range:

  • Width: 65–70 inches.
  • Length: almost always around 90 inches.

Why That Size?

Because the mattress is only about 38" wide, a 65–66" wide blanket leaves roughly 13–15" hanging on each side, which is enough to keep you covered without dragging excessively on the floor.

The 90" length gives extra fabric to tuck at the foot while still covering from shoulders to toes.

Twin vs Twin XL (Quick Note)

  • Twin blanket: ~65–66" x 90". Works on both twin and twin XL in many cases.
  • Twin XL mattress is longer, but many “twin” blankets are still sold as suitable for both, just with a bit less tuck at the foot on Twin XL.

TL;DR

If you’re shopping and wondering “what size is a twin blanket?” look for labels close to:

Twin blanket: 65–66 inches x 90 inches (W x L).

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