The barleycorn has been the basis of units of length and mass in a number of systems of units.

As a standard of length

In England and Scotland, at least as early as the 12th century an inch was thought of as 3 barleycorns laid end to end. A document of 1474 states: “III barley corns take out of the middes [middle] of the Ere make an Inche and XII inches makith a foote and III fote makith a yarde.” Occasionally “barleycorn” was used to mean one-third of an inch. It is still true that 36 barleycorns laid end to end closely approximate a foot, but legally the inch was always derived by subdividing such prototypes as the “king's iron yard.”

Ibn Khurrâdadhbih, writing in the 9th century, reported that the smallest unit of length in Islamic measure, the aasbaa, literally “finger,” was the width of 6 barleycorns laid side by side.

As a standard of mass

The grain, ¹/5760th of the troy pound and the apothecaries' pound, and ¹/7000th of the pound avoirdupois, is traditionally the weight of a barleycorn. Before the development of the modern strains of wheat and barley, the ratios 3 barley corns = 4 grains of wheat, 4 grains of wheat = 1 carob seed (siliqua) were used in many systems of weight. For example, as the se, the barleycorn was a standard of mass in ancient Sumeria.

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