What Is LBS? - The Pound Explained
1 lb = 0.453592 kg | 1 lb = 16 ounces | 14 lbs = 1 stone
What Does LBS Stand For?
LBS is the abbreviation for pound - the unit of weight. It comes from libra pondo, a Latin phrase meaning a pound by weight. Libra was the Roman unit of weight equivalent to approximately 329 grams, and pondo meant by weight. Over centuries, pondo shortened to pound in English, but the abbreviation retained the L from libra - which is why "lbs" does not appear to match the word "pound" at all.
The symbol lb (and its plural lbs) has been used in English-speaking countries for centuries. Today it appears on weighing scales, medical records, food packaging, and fitness apps - particularly in the United States, which uses pounds as its primary weight unit. In the UK, pounds are used alongside stone for body weight and kilograms for most official measurements.
How Much Is 1 Pound in KG?
One pound is exactly 0.45359237 kilograms. This is the internationally agreed definition, adopted in 1959 as part of the International Yard and Pound Agreement. It does not vary by country or context - one pound is always exactly 0.45359237 kg.
To convert pounds to kilograms, multiply by 0.453592. To convert kilograms to pounds, multiply by 2.20462.
Quick conversion reference - lbs to kg and kg to lbs
- 1 lb = 0.453592 kg | 1 kg = 2.20462 lbs
- 10 lbs = 4.54 kg | 10 kg = 22.05 lbs
- 100 lbs = 45.36 kg | 100 kg = 220.46 lbs
- 1 stone = 14 lbs = 6.35029 kg
- 1 kg = 2 lbs 3.27 oz (2.205 lbs)
How Does LBS Relate to Stone?
One stone equals exactly 14 pounds. This is fixed and has been standardised in UK law. The stone is used in the UK and Ireland for human body weight - GP records and hospital scales typically show kilograms, but most UK adults think of their weight in stone and pounds.
The conversion chain is: pounds ÷ 14 = stone. Or: stone × 14 = pounds. So 154 pounds is 11 stone, 168 pounds is 12 stone, and 196 pounds is 14 stone.
Why Does the UK Use Both Pounds and Stone?
The UK officially adopted the metric system for trade and official measurements in the 1970s and 1980s, but stone and pounds remain deeply embedded in everyday culture - particularly for body weight. When a UK adult is asked how much they weigh, the answer is almost always given in stone and pounds. Medical records use kilograms. Bathroom scales in the UK typically display all three: stone, kg, and lbs.
The pound itself has roots in the Anglo-Saxon period. The Norman and later the English Crown standardised various pound units over the centuries - the troy pound for precious metals, the avoirdupois pound for general goods. The avoirdupois pound (the one we use today for body weight) was defined as 16 ounces and has remained the standard since the 16th century.
Doctor's Note - Written by Dr Muhammad Usman, MBBS
In clinical practice, I use kilograms for all formal measurements - drug dosing, BMI calculation, weight charts, and referral criteria. But in conversation with patients, I always ask what unit they use to think about their weight. Most UK adults say stone. Some say kilograms. Almost none say pounds only. When a patient comes in with a figure in pounds - often from a US health app or American medical records - converting accurately to kilograms and stone is important for both clinical accuracy and for a conversation the patient can engage with in the units they understand.
Pounds vs Kilograms - Key Differences
| Feature | Pounds (lbs) | Kilograms (kg) |
|---|---|---|
| Official definition | 0.45359237 kg exactly | SI base unit of mass |
| Used for body weight in | USA, UK (alongside stone) | Most of the world; UK clinical settings |
| Subdivisions | 16 ounces = 1 lb | 1000 grams = 1 kg |
| Relation to stone | 14 lbs = 1 stone | 6.35029 kg = 1 stone |
| UK bathroom scales | Often shown alongside stone | Often shown alongside stone |
| NHS/WHO medical records | Converted to kg | Standard clinical unit |
Related Tools:
FAQs
What does lbs stand for?
LBS stands for libra pondo - Latin for a pound by weight. The abbreviation comes from libra, the Roman unit of weight.
How many lbs in a kg?
There are 2.20462 pounds in one kilogram. Multiply kg by 2.20462 to get pounds, or multiply lbs by 0.453592 to get kilograms.
How many lbs in a stone?
There are exactly 14 pounds in one stone. Multiply stone by 14 to get pounds; divide pounds by 14 to get stone.
Is lbs the same as pounds?
Yes. LBS is the abbreviation for pound. Both equal exactly 0.45359237 kilograms.
Why do Americans use pounds instead of kilograms?
The United States retained the imperial system after independence in 1776. The metric system was never mandated as the standard, so pounds, feet, and miles remain in everyday American use.
Dr Muhammad Usman
MBBSDr Muhammad Usman graduated with his MBBS from Avicenna International Medical University in Bishkek, Kyrgyzstan (2019–2024) and brings international clinical training across general medicine, surgery, and public health. He writes all health content on this site to current NHS/WHO guidelines, ensuring clinical accuracy and real-world relevance for UK readers.
View LinkedIn Profile