Convert Cubit (UK) (cubit (uk)) to Petameter (Pm) instantly.
About these units
Cubit (UK) (cubit (uk))
The UK cubit is a traditional English unit derived from the length of the forearm, roughly 0.4572 meters (18 inches). It was historically used in construction, land measurement, and woodworking, providing a human-scale reference for practical tasks before standardized units were widely adopted. In England, the cubit also played a role in surveying and architectural planning, often subdivided into smaller units such as hands or fingers for precision. Builders and craftsmen relied on the cubit because it allowed approximate measurement without instruments, a feature especially valuable in early medieval and pre-industrial periods. Although replaced by the foot and yard over time, the cubit remains an important historical reference for studying British architecture, surveying records, and early measurement systems.
Petameter (Pm)
A petameter is 10¹⁵ meters and begins bridging the gap between solar system scales and the nearest stars. Distances between stars, the size of large cosmic structures, or the wavelengths of extremely low-frequency electromagnetic waves may be expressed in petameters. For example, a light-year is about 9.46 petameters. Petameters rarely appear in everyday astronomical writing because traditional units like light years and parsecs are more intuitive to astronomers and the public. However, the unit's alignment with SI conventions makes it essential in scientific computation and large-scale modeling, especially when dealing with cosmic distances while maintaining strictly metric consistency.