Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Convert pounds to stones and ounces, with kg/g/ton equivalents.
10 st 160 oz
Stones and ounces is the traditional UK and Irish way of expressing body weight -- "12 stone 4" rather than a single decimal pounds figure. Unlike most unit conversions, this isn't a simple multiply-by-a-factor calculation: stones and ounces is a mixed-radix format, meaning the result is split across two different units (whole stones, then a remainder in ounces) rather than one decimal number.
Enter your weight in pounds. The result shows the equivalent in stones and ounces (e.g. "12 stone 4 oz"), along with the same weight in kilograms, grams, metric tons, and US tons.
Total Ounces = Pounds × 16
Stones = floor(Total Ounces ÷ 224)
Remaining Ounces = Total Ounces − (Stones × 224)
224 is the number of ounces in one stone (14 lb × 16 oz/lb). The "floor" (round-down) step is what makes this mixed-radix -- it finds the largest whole number of stones that fits, then expresses whatever's left over in ounces, the same way a clock converts total minutes into hours-and-minutes rather than a decimal hour figure.
Anyone comparing a US pounds-based weight (from a scale, medical record, or fitness app) against a UK or Irish stone-based figure -- common when following international health guidance, sports weigh-ins (boxing, wrestling, horse racing use stones), or reading UK media. For a full US/metric weight conversion suite, see the Pounds to KG Converter.
This converts weight units only -- it doesn't interpret or provide any health/BMI context. Stones are used almost exclusively for body weight in UK/Irish English; you generally won't see stones used for parcels, produce, or other everyday weight measurements.
Real body weights rarely land on a neat stone boundary, so here are hypothetical examples that show the remainder step. For 185 lb: 185 × 16 = 2,960 oz. Dividing by 224 gives 13 whole stones (13 × 224 = 2,912 oz), leaving 48 oz. The result is 13 stone 48 oz. Since 48 oz is 3 lb, the same weight is written in everyday UK style as 13 stone 3 lb.
For 130 lb: 130 × 16 = 2,080 oz. Nine stones use 2,016 oz, leaving 64 oz, which is 9 stone 4 lb in common speech. For 100.5 lb: 1,608 oz gives 7 stone (1,568 oz) with 40 oz left over, or 7 stone 2 lb 8 oz. And for 224 lb: exactly 16 stone, with no remainder.
The most frequent mistake is reading 12 stone 4 as 12 stone and 4 ounces. In ordinary UK speech the second number is almost always pounds, so the same person, if entered here as ounces, would be recorded as 4 lb lighter than intended. Always check which unit your source uses.
Another common slip is entering kilograms as if they were pounds. A scale set to kg shows a number roughly 2.2 times smaller than the pound figure, so entering 82 (kg) here would produce a weight far below the real figure. Confirm the unit shown on your scale before you type.
People use this conversion when reading UK health pages and sports coverage, filling out forms that request stones, or comparing a personal target set in stones against a US scale. It is also useful for translating a pounds reading from a fitness app into the format a UK relative or physician would use in conversation.
The tool only converts units; it does not comment on whether a weight is healthy, and it should not be used to judge anyone's health. For questions about weight goals, body composition, or medical conditions, speak with a doctor or registered dietitian. Also note that displayed values are rounded, so tiny fractions of an ounce may not appear even when the input had them.
14 pounds exactly -- one stone is defined as 14 lb, a traditional English unit still used for body weight in the UK and Ireland.
Because that's how stones and ounces are conventionally expressed together -- "12 stone 4" (meaning 12 stone plus 4 pounds, or occasionally ounces depending on context) is the natural spoken/written format, not a single decimal stone figure.
The 14 lb stone is the standard UK/Irish definition used here -- some other countries and historical contexts have used different "stone" weights, but 14 lb is by far the most common modern usage.
13 stone with 48 ounces left over, which equals 13 stone 3 lb.
Because the remainder covers everything under one full stone (224 oz). Divide it by 16 to see the pounds.
Yes. Values like 100.5 are converted to total ounces first, so the half pound becomes 8 oz in the remainder.
Not in daily life; stones are mainly a UK and Irish custom for body weight, so US scales and forms almost always use pounds.
Reference: NIST Weights and Measures