Convert lbs to stone

Pound

Definition
A pound (symbol: lb) is a mass unit in the Imperial and U.S. customary systems. The modern international avoirdupois pound is defined as exactly 0.45359237 kg and splits into 16 ounces for practical fractional use.

History
Originating from the Roman libra, the pound underwent many local variants throughout medieval Europe until the 13th-century adoption of the avoirdupois system standardized it at 16 ounces—a choice driven by the ease of dividing 16 by 2, 4, and 8. The current definition was internationally ratified in 1959.

Usage Today
In the United States, pounds remain the standard for body weight, groceries, and general trade. In the United Kingdom, although metric units are official, pounds still appear on food labels and in personal-weight descriptions (often alongside stones).

Stone (US)

Definition
The U.S. stone is a traditional weight measure set at 12.5 pounds. While the British stone is usually 14 lb, American usage historically adopted this 12.5 lb variant for certain agricultural and postal contexts.

History
Stones as weight measures go back to ancient trading practices, where rough “stones” were used as balance counterweights. In the U.S., a 12.5 lb stone emerged in some regional systems before metric and standardized Imperial measures dominated.

Usage Today
The U.S. stone is now rare—occasionally encountered in historical records or specialized industries—but remains a handy reference for converting bulk weights in older American texts.

Pound → Stone (US) Conversion Table

How to Convert

• 1 lb = 0.08 stone (US)

• 1 stone (US) = 12.5 lb

Example
To convert 15 lb into U.S. stones:

15 lb × 0.08 = 1.20 stone (US)