The term “nanosatellite” or “nanosat” is usually applied to the name of an artificial satellite with a wet mass between 1 and 10 kg (2.2–22 lb). “CubeSats” (cubesatellite, cube satellite) are a type of nanosatellites defined by the CubeSat Design Specification (CSD), unofficially called CubeSat standard.

Dimensions:

  • 1U CubeSat is 10 cm × 10 cm × 11.35 cm.
  • 2U CubeSat is 10 cm × 10 cm × 22.70 cm.
  • 6U CubeSat is 20 cm × 10 cm × 34.05 cm.
  • 12U CubeSat is 20 cm × 20 cm × 34.05 cm.
  • Smallest existing CubeSat size is 0.25U and largest is 27U.

Source: nanosats.eu/cubesat.html