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The Royal Cubit (Ancient Egyptian: meh nesut) was the primary ancient Egyptian standard unit of linear measure. It was based on the length of the forearm from the elbow to the tip of the extended middle finger, plus the width of the palm. It is considered one of the earliest attested standard units of measurement.

The Royal Cubit was typically divided into 7 palms (shesep), with each palm further divided into 4 digits or fingers (djeba), totaling 28 digits. Its length varied slightly over time and location but is generally accepted to be approximately 52.3 to 52.9 centimeters (about 20.6 to 20.8 inches). A common average value used is 0.524 meters.

A shorter Common Cubit or Short Cubit (Ancient Egyptian: meh sherer) also existed, measuring 6 palms (24 digits), approximately 45 cm.

The Royal Cubit emerged very early in Egyptian history, likely during the Predynastic or Early Dynastic Period (before 3000 BCE). Its standardization was crucial for the large-scale construction projects undertaken by the pharaohs.

• Early Standardization: It represents one of history's first successful attempts at creating and maintaining a standard unit of length, essential for architectural precision and administrative consistency.
• Cubit Rods: Physical standards, known as cubit rods, were created from durable materials like wood, slate, or granite. These rods were often inscribed with subdivisions (palms, digits, and sometimes fractions of digits) and sometimes bore dedications or official insignia. Examples have been found in tombs, such as that of Tutankhamun, and likely served as official benchmarks.
• Monumental Construction: The Royal Cubit was the fundamental unit used in the design and construction of temples, palaces, and most famously, the pyramids. The precise dimensions of structures like the Great Pyramid of Giza reflect careful measurement using this standard.
• Longevity: The Royal Cubit remained the standard measure in Egypt for millennia, from the Old Kingdom through the Ptolemaic period and into Roman times, demonstrating remarkable stability.

The Royal Cubit was integral to many aspects of ancient Egyptian society:

• Architecture and Construction: Defining building dimensions, column heights, room layouts, and overall structural proportions.
• Land Surveying: Measuring fields for agriculture, taxation, and property boundaries, especially after the annual Nile flood receded.
• Record Keeping: Used in administrative documents, inventories, and calculations.
• Craftsmanship: Measuring materials like stone blocks, timber, rope, and textiles.
• Art and Iconography: Used to establish proportions in statues and reliefs according to canonical rules.
• Religious and Funerary Contexts: Cubit rods were sometimes included in tomb equipment, possibly symbolizing order and correctness or serving a practical purpose in the afterlife.
• Historical Texts: The term "cubit" appears in various ancient texts, including the Bible, though the specific length intended (Egyptian Royal, common, Babylonian, etc.) can be context-dependent.