Convert weight and mass units — kilograms, pounds, ounces, grams, tons, stones.
| Unit | Name | Value |
|---|---|---|
| kg | Kilogram | 0.453592 |
| g | Gram | 453.592 |
| mg | Milligram | 453592 |
| t | Metric Ton | 0.000453592 |
| oz | Ounce | 16 |
| st | Stone | 0.071428549 |
The Pound (lb) and the Stone (st) are both units of weight & mass. Converting between them is straightforward using the formula above.
Formula: 1 lb = 0.07142855 st
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
| Pound (lb) | Stone (st) | Real-world context |
|---|---|---|
| 1 lb | 0.07142855 st | loaf of bread |
| 10 lb | 0.71428549 st | small dog |
| 100 lb | 7.1428549 st | child |
| 500 lb | 35.7142745 st | |
| 1000 lb | 71.4285489 st |
1 pound (lb) equals exactly 0.07142855 stone (st). Use the formula: lb × 0.07142855 = st.
To convert pounds to stone, multiply your value in pounds by 0.07142855. For example, 5 lb × 0.07142855 = 0.35714274 st.
100 pounds = 7.1428549 stone. Calculation: 100 × 0.07142855 = 7.1428549.
To convert stone back to pounds, divide by 0.07142855 (or multiply by 14.0000044). Example: 10 st ÷ 0.07142855 = 140 lb.
Yes. This converter uses the internationally recognised exact conversion factor: 1 lb = 0.07142855 st. All calculations are performed in your browser with no rounding until display.
10 pounds = 0.71428549 stone. Simply multiply by 0.07142855.
Converting pounds to stone is commonly needed for everyday tasks like cooking recipes, body weight tracking, shopping internationally, or shipping parcels where one system uses lb and another uses st.
The pound (lb) is the primary unit of mass in the US customary and British imperial systems, equal to exactly 453.59237 grams since the International Yard and Pound Agreement of 1959. It is subdivided into 16 ounces. The abbreviation "lb" comes from the Latin libra (scales/balance), while "pound" derives from Latin pondus (weight).
The stone (st) is a British imperial unit of mass equal to exactly 14 avoirdupois pounds or 6.35029318 kilograms. Used almost exclusively in the United Kingdom and Ireland for human body weight, it has no role in scientific, commercial, or international contexts. The stone is not an SI unit and was removed from official UK trade measurement in 1985, though it remains deeply embedded in everyday British culture.
The pound traces its origins to ancient Rome's libra pondo (pound weight, ~329 g). Various standards existed in medieval Europe — Troy, Tower, and merchant pounds — until the avoirdupois pound emerged in 13th–14th century England for general trade. The British Weights and Measures Act 1878 formalised it. The modern definition (453.59237 g) was fixed by the US, UK, Australia, Canada, New Zealand, and South Africa in 1959.
Interesting fact: The word "pound sterling" originally meant one pound (12 troy ounces) of sterling silver. Today's British pound currency takes its name from the unit of mass, not the other way around.
One of the oldest English weight units, the stone was referenced as early as the 13th century. Historically its value varied by commodity (8 lb for meat, 12 lb for hemp, 14 lb for wool, 16 lb for glass). King Edward III standardised the wool stone at 14 pounds in 1350, which became the universal English standard. The Weights and Measures Act 1835 formally defined the stone as 14 lb. EU harmonisation abolished the stone for trade in 1985.
Interesting fact: The world record heaviest person weighed 635 kg — exactly 100 stone, illustrating how the stone unit provides digestible reference points for large body weights. British people typically express their weight as, for example, "11 stone 4 pounds."