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Convert pounds to stone instantly using the exact factor of 1 stone = 14 pounds. Ideal for UK body weight measurements, fitness tracking, and international weight conversions.
1 stone
= 14 pounds
1 pound
= 0.0714 stone
1 stone
= 6.35029 kg
Formula
st = lb ÷ 14
Formula: Stone = Pounds / 14
| Pounds (lb) | Stone (decimal) | Stone & Pounds | Context |
|---|---|---|---|
| 100 lb | 7.143 st | 7 st 2 lb | Lightweight adult or teenager |
| 112 lb | 8.000 st | 8 st 0 lb | Exactly 8 stone |
| 126 lb | 9.000 st | 9 st 0 lb | Small-frame adult |
| 140 lb | 10.000 st | 10 st 0 lb | Average adult female (UK) |
| 150 lb | 10.714 st | 10 st 10 lb | Medium-build adult |
| 154 lb | 11.000 st | 11 st 0 lb | Boxing welterweight limit |
| 160 lb | 11.429 st | 11 st 6 lb | Average adult male (US) |
| 168 lb | 12.000 st | 12 st 0 lb | Exactly 12 stone |
| 175 lb | 12.500 st | 12 st 7 lb | Boxing middleweight limit |
| 182 lb | 13.000 st | 13 st 0 lb | Average adult male (UK) |
| 196 lb | 14.000 st | 14 st 0 lb | Exactly 14 stone (196 lb) |
| 200 lb | 14.286 st | 14 st 4 lb | Common fitness milestone |
| 210 lb | 15.000 st | 15 st 0 lb | Larger-build adult |
| 224 lb | 16.000 st | 16 st 0 lb | Rugby forward weight range |
| 250 lb | 17.857 st | 17 st 12 lb | Heavyweight athlete |
| 280 lb | 20.000 st | 20 st 0 lb | Exactly 20 stone |
| 300 lb | 21.429 st | 21 st 6 lb | Strongman competitor range |
| 350 lb | 25.000 st | 25 st 0 lb | Sumo wrestler weight class |
The pound (abbreviated lb, from the Latin libra) is a unit of mass in the imperial and US customary systems. One pound is defined as exactly 0.45359237 kilograms. It is the primary unit for measuring body weight and everyday objects in the United States, and it remains widely used in the UK alongside the metric system. Pounds are subdivided into 16 ounces.
The stone (abbreviated st) is an imperial unit of mass equal to exactly 14 pounds (approximately 6.35 kilograms). It is primarily used in the United Kingdom and Ireland for expressing human body weight. People in these countries commonly state their weight as “X stone Y pounds”—for example, “11 stone 4” means 11 stone and 4 pounds, or 158 pounds total.
Historically, the stone varied by region and commodity. Wool, glass, and different trade goods each had their own “stone” weight. The 14-pound stone was standardized in England by royal decree in 1389 under King Edward III, and it is the only version still in common use today. While the UK officially metricated in 1985, stone persists in everyday speech, media, health contexts, and on bathroom scales sold throughout Britain and Ireland. Understanding the relationship between pounds and stone is essential for anyone communicating weight across the Atlantic or reading British fitness and health publications.
stone = pounds ÷ 14
Since 1 stone = 14 pounds, divide any pound value by 14 to get stone. To convert back, multiply stone by 14 to get pounds.
Question: A person weighs 168 pounds. What is their weight in stone?
This is a clean conversion because 168 is evenly divisible by 14.
Question: Express 155 pounds in stone and pounds (mixed format).
This is the format most commonly used in the UK: “eleven stone one.”
Question: A gym-goer in the US weighs 200 pounds. What is that in stone?
A British person would say “fourteen stone four.”
Since 14 is close to 15, you can estimate by dividing pounds by 15 for a quick approximation, then adjust slightly upward. Alternatively, halve the pounds and divide by 7: for 182 lb, half is 91, and 91 ÷ 7 = 13 stone exactly. Memorize key anchors: 140 lb = 10 st, 154 lb = 11 st, 168 lb = 12 st, 182 lb = 13 st, and 196 lb = 14 st.
| Description | Pounds | Stone & Pounds | Kilograms |
|---|---|---|---|
| Small adult | 110 lb | 7 st 12 lb | 49.9 kg |
| Average female (UK) | 140 lb | 10 st 0 lb | 63.5 kg |
| Average male (US) | 160 lb | 11 st 6 lb | 72.6 kg |
| Average male (UK) | 182 lb | 13 st 0 lb | 82.6 kg |
| Athletic build | 200 lb | 14 st 4 lb | 90.7 kg |
| Large build | 230 lb | 16 st 6 lb | 104.3 kg |
| Heavyweight | 260 lb | 18 st 8 lb | 117.9 kg |
| Item | Pounds | Stone (decimal) | Kilograms |
|---|---|---|---|
| Carry-on bag limit | 15 lb | 1.07 st | 6.8 kg |
| Checked bag (economy) | 50 lb | 3.57 st | 22.7 kg |
| Checked bag (business) | 70 lb | 5.00 st | 31.8 kg |
| Small parcel | 5 lb | 0.36 st | 2.3 kg |
| Medium shipping box | 30 lb | 2.14 st | 13.6 kg |
| Large moving box | 65 lb | 4.64 st | 29.5 kg |
UK doctors, nurses, and dietitians frequently use stone when discussing patients’ weight. Understanding this conversion helps when reading NHS guidelines, comparing weight-loss progress, or communicating with British healthcare providers about BMI and target weights.
When traveling to the UK or Ireland, or speaking with friends and family there, weight is almost always discussed in stone. Converting pounds to stone helps you participate in everyday conversations, understand luggage allowances at British airports, and follow along with British media.
Boxing and combat sports use stone for weight classes in the UK. Rugby, cricket, and other British sports often report athlete weights in stone. Fitness apps and scales purchased in the UK display stone, so converting from pounds helps you track your progress consistently.
British novels, TV shows, and news reports reference weight in stone. Understanding this unit enriches your comprehension of British culture and avoids confusion when characters or presenters mention their weight as “twelve stone seven” rather than 175 pounds.
Stone and kilograms are completely different units. One stone is about 6.35 kg, not 14 kg. When someone says they weigh “10 stone,” that is 140 pounds or about 63.5 kg—not 10 kg.
In British English, the plural of stone (as a weight unit) is “stone,” not “stones.” You say “she weighs 10 stone,” not “10 stones.” However, “stones” is sometimes used informally.
British people rarely say “10.714 stone.” Instead, they say “10 stone 10 pounds” (or “10 stone 10”). When communicating weight in stone, always convert the decimal remainder to pounds by multiplying by 14.
While dividing by 15 is a handy mental math shortcut for quick estimates, it introduces about a 7% error. For medical, fitness, or official purposes, always divide by the exact factor of 14.
Pounds to stone: divide by 14. Stone to pounds: multiply by 14. A common mistake is multiplying when you should divide, which gives a result 196 times too large. If your result seems unreasonably large or small, you likely used the wrong operation.
One stone equals exactly 14 pounds. This is a fixed, exact conversion factor. To convert stone to pounds, multiply the stone value by 14. For example, 10 stone equals 140 pounds.
Divide the total pounds by 14. The whole number is the stone value, and the remainder is the leftover pounds. For example, 155 pounds divided by 14 equals 11 with a remainder of 1, so 155 lb = 11 st 1 lb.
Despite the UK officially adopting the metric system, stone remains popular for measuring body weight due to cultural tradition and familiarity. Many British and Irish people find stone more intuitive for expressing personal weight than kilograms, and it is widely used in everyday conversation, media, and healthcare settings.
No, stone is not commonly used in the United States. Americans measure body weight in pounds only. However, understanding stone is useful when communicating with people from the UK and Ireland or when reading British publications.
The formula is: stone = pounds / 14. Since one stone equals exactly 14 pounds, you simply divide the number of pounds by 14 to get the equivalent in stone. For the reverse, multiply stone by 14 to get pounds.
First convert stone to pounds by multiplying by 14, then convert pounds to kilograms by dividing by 2.20462. Alternatively, multiply stone by 6.35029 directly. For example, 10 stone = 63.503 kg.
The stone originated in medieval trade as a literal stone used for weighing goods. Different commodities had different stone weights. The 14-pound stone was standardized in England in 1389 by a royal statute and became the official standard for body weight, which persists today in the UK and Ireland.
The conversion is mathematically exact because 1 stone is defined as precisely 14 pounds. There is no rounding involved in the definition. Any decimal results come from pounds values that are not evenly divisible by 14.
This calculator provides accurate weight conversions using the standard definition of 1 stone = 14 pounds. For medical or clinical weight assessments, always verify measurements with calibrated equipment and consult a qualified healthcare professional. This tool is intended for general informational and educational purposes only.