Palms to Inches (palm to in)

1 palm equals 3 inches exactly.

1 palm = 3 inches

How to convert palms to inches

To convert palms to inches, multiply the number of palms by 3. This factor is exact. To go the other way, multiply inches by 0.3333333333 (rounded).

inches = palms × 3

Example: 10 palms = 30 inches.

About these units

Palm (palm)

Medieval EnglishHistorical unit (no longer in standard use)

3 inches (7.62 cm), about the breadth of a hand without the thumb. One of the oldest body-based units, used in many cultures with values of roughly 7 to 9 cm.

Open a hand flat and the part below the fingers gives the palm its name, which came through Old French from Latin palma, a word tied to a root meaning flat. As a measure it was the width of four fingers. Egyptian cubit-rods mark palms of about 7.5 cm from the reign of Djer in the First Dynasty, and Greek, Roman and Israelite palms fell between about 6.7 and 8.8 cm. In those systems three palms made a span and six a cubit.

In England the palm is given as 3 inches, or 7.62 cm, the figure used here, but the evidence is tangled, since the four-inch hand was sometimes confused with it and Wiktionary even glosses the English palm as four inches. Medieval Italy, France and Iberia used a much longer palm descended from the Roman greater palm, around 24.6 to 24.8 cm, while Morocco's was about 18.2 cm. The palm was left out of Britain's Weights and Measures Act of 1824 and is not a US customary unit.

1 palm = 0.0762 meters (exactly).

Sources: Wikipedia: Palm (unit); Wikipedia: Hand (unit); Wiktionary: palm

Inch (in)

US & ImperialCurrent unit

1/12 of a foot. Defined as exactly 25.4 millimeters since 1959, when the US and Commonwealth countries agreed a common international inch.

Latin uncia, meaning one-twelfth, is the root of both inch and ounce, and it passed into Old English as ynce. Roman measurers divided their foot into twelve unciae, and the English inch kept that twelfth. After 1066 an inch was reckoned as three barleycorns, and a 1324 statute attributed to Edward II spelled out the definition as three grains of barley, dry and round, placed end to end lengthwise. For centuries the inch was simply a twelfth of a foot, or a thirty-sixth of a yard, and the US and UK each kept their own copy of the standard yard.

Those copies differed slightly until the 1959 international agreement fixed the yard at exactly 0.9144 meter, which made the inch exactly 25.4 millimeters. The US adopted it in 1959 and the UK ratified it in 1963, effective 1964. Today the inch is still the customary unit in the United States and Canada, and the UK keeps it on road signs. Worldwide it also names display diagonals, wheel rims, tire codes and pipe sizes.

1 inch = 0.0254 meters (exactly).

Sources: Wikipedia: Inch; Wikipedia: Yard; NIST Guide to the SI, Appendix B.8: conversion factors

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