Lbs to Kg Calculator — Free Pounds to Kilograms Converter UK
Convert pounds to kilograms, kilograms to pounds, and see body weight in stone with our free UK lbs to kg calculator. Also convert ounces to grams. 1 lb = 0.453592 kg exactly — used by the NHS, UK gyms, and for airline luggage limits across Britain.
Lbs to Kg Quick Reference Table (1–300 lbs)
This comprehensive pounds to kilograms reference table covers the full range from 1 lb to 300 lbs, with stone equivalents included for UK users. Bookmark this page for quick reference when you need to convert lbs to kg in the UK.
| Lbs | Kg | Stone & lbs | Lbs | Kg | Stone & lbs |
|---|---|---|---|---|---|
| 1 | 0.45 kg | 0 st 1 lb | 160 | 72.57 kg | 11 st 6 lb |
| 2 | 0.91 kg | 0 st 2 lb | 165 | 74.84 kg | 11 st 11 lb |
| 3 | 1.36 kg | 0 st 3 lb | 170 | 77.11 kg | 12 st 2 lb |
| 5 | 2.27 kg | 0 st 5 lb | 175 | 79.38 kg | 12 st 7 lb |
| 7 | 3.18 kg | 0 st 7 lb | 180 | 81.65 kg | 12 st 12 lb |
| 10 | 4.54 kg | 0 st 10 lb | 185 | 83.91 kg | 13 st 3 lb |
| 14 | 6.35 kg | 1 st 0 lb | 190 | 86.18 kg | 13 st 8 lb |
| 20 | 9.07 kg | 1 st 6 lb | 195 | 88.45 kg | 13 st 13 lb |
| 25 | 11.34 kg | 1 st 11 lb | 200 | 90.72 kg | 14 st 4 lb |
| 30 | 13.61 kg | 2 st 2 lb | 210 | 95.25 kg | 15 st 0 lb |
| 40 | 18.14 kg | 2 st 12 lb | 220 | 99.79 kg | 15 st 10 lb |
| 50 | 22.68 kg | 3 st 8 lb | 225 | 102.06 kg | 16 st 1 lb |
| 60 | 27.22 kg | 4 st 4 lb | 230 | 104.33 kg | 16 st 6 lb |
| 70 | 31.75 kg | 5 st 0 lb | 240 | 108.86 kg | 17 st 2 lb |
| 80 | 36.29 kg | 5 st 10 lb | 250 | 113.40 kg | 17 st 12 lb |
| 90 | 40.82 kg | 6 st 6 lb | 260 | 117.93 kg | 18 st 8 lb |
| 100 | 45.36 kg | 7 st 2 lb | 270 | 122.47 kg | 19 st 4 lb |
| 110 | 49.90 kg | 7 st 12 lb | 280 | 127.01 kg | 20 st 0 lb |
| 120 | 54.43 kg | 8 st 8 lb | 290 | 131.54 kg | 20 st 10 lb |
| 130 | 58.97 kg | 9 st 4 lb | 300 | 136.08 kg | 21 st 6 lb |
| 140 | 63.50 kg | 10 st 0 lb | |||
| 150 | 68.04 kg | 10 st 10 lb |
Formula: kg = lbs x 0.45359237. Stone = lbs / 14 (remainder = remaining lbs). All values rounded to 2 decimal places.
Lbs to Kg Body Weight Table with BMI (100–300 lbs)
| Lbs | Kg | Stone & lbs | BMI (5'8" / 173 cm) |
|---|---|---|---|
| 100 | 45.36 kg | 7 st 2 lb | 15.3 |
| 110 | 49.90 kg | 7 st 12 lb | 16.7 |
| 120 | 54.43 kg | 8 st 8 lb | 18.2 |
| 130 | 58.97 kg | 9 st 4 lb | 19.7 |
| 140 | 63.50 kg | 10 st 0 lb | 21.2 |
| 150 | 68.04 kg | 10 st 10 lb | 22.7 |
| 160 | 72.57 kg | 11 st 6 lb | 24.2 |
| 170 | 77.11 kg | 12 st 2 lb | 25.7 |
| 180 | 81.65 kg | 12 st 12 lb | 27.2 |
| 190 | 86.18 kg | 13 st 8 lb | 28.7 |
| 200 | 90.72 kg | 14 st 4 lb | 30.2 |
| 220 | 99.79 kg | 15 st 12 lb | 33.3 |
| 250 | 113.40 kg | 17 st 12 lb | 37.8 |
| 300 | 136.08 kg | 21 st 6 lb | 45.3 |
BMI shown for reference at height 5'8" (173 cm). BMI = kg / (height in metres)². NHS BMI ranges: underweight <18.5, healthy 18.5-24.9, overweight 25-29.9, obese 30+. Use our BMI Calculator for your exact height.
The Pound: History and Definition
The pound (lb) is one of the oldest units of weight in continuous use in Britain, with roots going back to the Roman libra pondo (pound weight) — which is why both "lb" (the abbreviation) and "£" (the currency symbol) derive from the Latin libra. Over centuries, several different pounds were used in Britain: the Tower pound, the Troy pound, the Merchant pound, and the Avoirdupois pound.
Today's pound is the avoirdupois pound, internationally defined since 1959 as exactly 0.45359237 kilograms. This definition was agreed by the United States, Canada, Australia, New Zealand, South Africa, and the United Kingdom in the International Yard and Pound Agreement of 1959. It replaced earlier, slightly varying national definitions.
UK Weight Measurement: A Brief History
The story of weight measurement in the United Kingdom is one of gradual, sometimes reluctant, transition from an ancient imperial system to the international metric system. Understanding this history explains why British people in 2025/26 still juggle between pounds, kilograms, and stone in everyday life.
The Imperial Era (Pre-1960s)
For centuries, Britain used the avoirdupois system for everyday weight measurement: ounces, pounds, stone, hundredweight, and tons. The word "avoirdupois" comes from Anglo-Norman French meaning "goods of weight." The system was formalised by the Weights and Measures Act, which defined the pound as 7,000 grains and the stone as 14 pounds.
In this era, a British person might buy "half a pound of butter," weigh themselves at "12 stone 4," and ship cargo measured in hundredweight (112 lbs or 50.80 kg). The system was deeply embedded in British culture, language, and commerce.
The Metrication Transition (1965–Present)
In 1965, the UK government announced a programme to adopt the metric system, initially targeting industry and trade. The Metrication Board was established in 1969 to oversee the change. Key milestones include:
- 1969: Metrication Board established to coordinate the UK's transition
- 1971: Decimal currency (£1 = 100p) replaced the old pounds, shillings, and pence
- 1980: Metrication Board dissolved after political pushback; voluntary metrication continued
- 1995: EU Directive 80/181/EEC required metric units for trade in the UK
- 2000: Loose goods (fruit, vegetables, meat) required to be sold by metric weight
- 2007: "Metric Martyrs" case — Sunderland market trader Steve Thoburn was convicted for selling bananas by the pound
- 2022: Post-Brexit, UK government announced that imperial units could again be used alongside metric for trade
The result in 2025/26 is a unique dual system. Food packaging shows grams and kilograms. Scales in doctors' surgeries measure in kilograms.
But step on the scales at home, and most British people still think in stones and pounds. This is why a pounds to kilograms converter is so essential for UK residents — it bridges the gap between how people think about weight and how it is officially measured.
Legal Position in 2025/26
Under the UK government's guidance on metric measurements, kilograms are the legal unit for selling goods by weight. However, imperial equivalents may be displayed alongside metric measurements. For body weight, there is no legal restriction — people can describe their weight however they wish. In practice, the NHS uses kg, pharmacies use kg, and British conversation uses stone.
Common Lbs to Kg Conversions in the UK
Here are the most common real-world scenarios where UK residents need to convert between pounds and kilograms, with practical reference values for each.
Baby Birth Weights (Lbs/Oz to Kg)
One of the most common times British parents need lbs-to-kg conversion is at birth. The NHS records weight in grams and kilograms, but family and friends expect to hear pounds and ounces.
| Description | Lbs & Oz | Kg | Grams |
|---|---|---|---|
| Very low birth weight | 3 lbs 5 oz | 1.50 kg | 1,500 g |
| Low birth weight threshold | 5 lbs 8 oz | 2.50 kg | 2,500 g |
| 25th percentile | 6 lbs 5 oz | 2.87 kg | 2,870 g |
| UK average birth weight | 7 lbs 4 oz | 3.30 kg | 3,300 g |
| 75th percentile | 8 lbs 2 oz | 3.69 kg | 3,690 g |
| Large for gestational age | 8 lbs 13 oz | 4.00 kg | 4,000 g |
| Macrosomia threshold | 9 lbs 14 oz | 4.50 kg | 4,500 g |
Source: NHS - Your baby's weight and height. The Royal College of Paediatrics and Child Health (RCPCH) publishes UK-WHO growth charts used by health visitors to track infant growth in kilograms.
UK Airline Luggage Limits (Kg and Lbs)
When packing for a holiday, UK travellers need to convert between the kg limits on airline tickets and the pounds reading on their home bathroom scales. Here are the standard UK airline luggage allowances:
| Airline | Cabin Bag | Checked Bag | Lbs Equivalent |
|---|---|---|---|
| British Airways (Economy) | 23 kg | 23 kg | 51 lbs |
| Ryanair | 10 kg | 20 kg | 44 lbs |
| easyJet | 15 kg | 15 kg / 23 kg | 33 / 51 lbs |
| Jet2 | 10 kg | 22 kg | 49 lbs |
| TUI | 10 kg | 15 kg / 20 kg | 33 / 44 lbs |
| Virgin Atlantic | 10 kg | 23 kg | 51 lbs |
Tip: If your home scales show pounds, multiply by 0.4536 to check you are under the kg limit. Or use the calculator at the top of this page for an instant conversion.
Gym Weights: Common Plate Loads in Lbs and Kg
UK gym-goers frequently need to convert between American fitness programmes (written in lbs) and the metric plates on British gym equipment. Here are common training loads with both units:
| Training Milestone | Lbs | Kg | Plates per Side (20 kg bar) |
|---|---|---|---|
| Empty barbell | 44 lbs | 20 kg | None |
| Beginner bench press | 95 lbs | 43 kg | 1 x 10 kg + 1 x 1.25 kg |
| 1 plate bench (US term) | 135 lbs | 61 kg | 1 x 20 kg |
| Intermediate squat | 185 lbs | 84 kg | 1 x 20 kg + 1 x 10 kg + 1 x 2.5 kg |
| 2 plate deadlift | 225 lbs | 102 kg | 2 x 20 kg + 1 x 1.25 kg |
| Advanced bench | 275 lbs | 125 kg | 2 x 20 kg + 1 x 10 kg + 1 x 2.5 kg |
| 3 plate squat | 315 lbs | 143 kg | 3 x 20 kg + 1 x 1.25 kg |
| 4 plate deadlift | 405 lbs | 184 kg | 4 x 20 kg + 1 x 2.5 kg |
When You Need Lbs to Kg in the UK
There are many everyday situations in Britain where converting between pounds and kilograms is necessary. Here are the most common scenarios in 2025/26:
NHS and Healthcare
The NHS BMI calculator requires your weight in kilograms. If you know your weight only in stones or pounds, you need to convert. Drug dosing is calculated per kilogram — for example, paracetamol for children is dosed at 15 mg/kg.
Anaesthetists need accurate weights in kg before surgery. The NHS Healthy Weight guidance defines healthy BMI as 18.5 to 24.9 kg/m².
Travel and Luggage
Every UK airline states luggage allowances in kilograms. If you weigh your suitcase on bathroom scales that show pounds, you need to multiply by 0.4536 to get kilograms. Exceeding the limit by even 1 kg can result in excess baggage charges of £10-£15 per kg at the airport. Pre-booking extra luggage weight online is always cheaper.
Fitness and Training
American fitness programmes (StrongLifts 5x5, Starting Strength, nSuns) give all weights in pounds. UK gyms use kilogram plates. Converting accurately is essential to follow these programmes. Many British gym-goers keep a mental note that "1 plate = 20 kg = ~44 lbs" and work from there.
Cooking and Baking
Many British cookbooks still use imperial measurements (ounces and pounds), while digital kitchen scales default to grams. A typical conversion: "1 lb of flour" = 454 g. "Half a pound of butter" = 227 g (or one standard UK butter block). American recipes use cups rather than weight, but when weight is specified, it is in ounces and pounds rather than grams.
Parcels and Shipping
Royal Mail and UK courier services (DPD, Hermes/Evri, DHL) price by kilograms. Royal Mail's maximum parcel weight is 30 kg (66 lbs). If you are shipping items and your postal scale shows pounds, convert to kg before selecting a shipping service to ensure you choose the correct weight band.
Body Weight in the UK: Stone, Lbs, and Kg
The UK has a unique relationship with body weight measurement. Officially, the NHS uses kilograms for all clinical purposes. BMI calculations, drug dosing by body weight, and nutritional assessments are all in metric. Yet informally, most British adults describe their weight in stones and pounds — a system that does not exist in the US (which uses only pounds) or in most of Europe (which uses only kilograms).
This creates genuine confusion. A British person who weighs 11 stone might not immediately know that this equals:
- 154 pounds (11 × 14 = 154)
- 69.85 kilograms (154 × 0.453592)
When visiting an NHS clinic, patients are typically weighed in kilograms on clinical scales. The doctor calculates BMI using kilograms and height in metres. But the patient goes home and tells their family they weigh "11 stone" — none of the three measurement systems quite aligning in everyday British health conversations.
Gym Weights: Lbs vs Kg Plates
UK gyms typically use metric (kg) weight plates, but many exercises and personal bests are still discussed in pounds among gym-goers influenced by American fitness culture. Here is a practical reference for common barbell configurations:
| Plates Each Side | Total Weight (kg) | Total Weight (lbs) | Common Use |
|---|---|---|---|
| 2 × 5 kg | 30 kg (bar 20 kg) | 66.1 lbs | Beginner squat/deadlift |
| 2 × 10 kg | 40 kg (bar 20 kg) | 88.2 lbs | Light press/row |
| 2 × 20 kg | 60 kg (bar 20 kg) | 132.3 lbs | Intermediate bench press |
| 2 × 20 + 2 × 5 kg | 70 kg (bar 20 kg) | 154.3 lbs | Common deadlift starting weight |
| 2 × 40 kg | 100 kg (bar 20 kg) | 220.5 lbs | "100 kg club" milestone |
| 2 × 50 kg + 2 × 10 kg | 140 kg (bar 20 kg) | 308.6 lbs | Advanced powerlifting |
The American "plate" (45 lbs = 20.41 kg) is very close to the 20 kg metric plate (44.09 lbs), which is why both cultures effectively train with the same real load while using different numbers. A US lifter boasting a "315 lb bench" has lifted 142.9 kg — equivalent to 7 standard 20 kg plates plus the bar.
Boxing Weight Classes in Lbs and Kg
Boxing weight categories were originally defined in pounds and remain standardised in pounds by most governing bodies, though the British Boxing Board of Control (BBBofC) and European bodies now use both. Here are the main professional boxing weight classes:
| Weight Class | Max Weight (lbs) | Max Weight (kg) | Max Weight (stone) |
|---|---|---|---|
| Strawweight / Mini Flyweight | 105 lbs | 47.6 kg | 7 st 7 lb |
| Flyweight | 112 lbs | 50.8 kg | 8 st 0 lb |
| Bantamweight | 118 lbs | 53.5 kg | 8 st 6 lb |
| Featherweight | 126 lbs | 57.2 kg | 9 st 0 lb |
| Lightweight | 135 lbs | 61.2 kg | 9 st 9 lb |
| Welterweight | 147 lbs | 66.7 kg | 10 st 7 lb |
| Middleweight | 160 lbs | 72.6 kg | 11 st 6 lb |
| Light Heavyweight | 175 lbs | 79.4 kg | 12 st 7 lb |
| Heavyweight | 200+ lbs | 90.7+ kg | 14 st 4 lb+ |
Baby Birth Weight: Lbs/Oz vs Kg
In the UK, baby birth weights are officially recorded in grams and kilograms by the NHS. A healthy full-term newborn typically weighs between 2.5 kg (5 lbs 8 oz) and 4.5 kg (9 lbs 14 oz), with the average being approximately 3.3 kg (7 lbs 4 oz).
Despite official metric recording, British parents almost universally remember and share their babies' birth weights in pounds and ounces. "She was 7 pounds 6 ounces" is the typical British announcement — not "3.34 kilograms." This cultural habit has persisted even as the generation of parents grew up with metric education in schools.
Common UK birth weight reference points:
- Low birth weight: under 2.5 kg (5 lbs 8 oz)
- Average birth weight: 3.3 kg (7 lbs 4 oz)
- Large for gestational age: over 4 kg (8 lbs 13 oz)
- Macrosomia (very large baby): over 4.5 kg (9 lbs 14 oz)
Olympic Weightlifting: Kg Only
Olympic weightlifting uses kilograms exclusively and has since the early 20th century. The 2020 Tokyo Olympic weightlifting categories for men were: 61 kg, 67 kg, 73 kg, 81 kg, 89 kg, 96 kg, 102 kg, 109 kg, and +109 kg. For women: 49 kg, 55 kg, 59 kg, 64 kg, 71 kg, 76 kg, 81 kg, 87 kg, and +87 kg.
For British viewers used to thinking in stone and pounds, the 81 kg category corresponds to approximately 12 stone 11 lbs, and the 109 kg category corresponds to about 17 stone 2 lbs.
Sources and Methodology
All conversion values on this page use the internationally agreed definition: 1 pound = 0.45359237 kilograms exactly, established by the International Yard and Pound Agreement of 1959. Stone is calculated as 14 pounds. BMI is calculated as weight (kg) divided by height (metres) squared.
Health and weight data is sourced from official UK government and NHS publications:
- GOV.UK - Using metric measurements — Official UK government guidance on legal measurement units
- NHS - Healthy Weight — NHS guidance on healthy weight ranges, BMI categories, and weight management
- NHS BMI Calculator — The official NHS BMI calculator using metric measurements
- NHS - Your baby's weight and height — NHS guidance on newborn weight ranges and growth tracking
- Health Survey for England (GOV.UK) — Source for average UK adult weight and obesity statistics
- Weights and Measures Act 1985 — The legal framework for measurement units in the UK
This calculator does not store any personal data. All conversions are performed locally in your browser. Last updated: March 2026.
Related Calculators
- Stone to Kg Converter — Convert stone and pounds to kilograms
- Stone to Kg Calculator — Detailed stone to kilogram conversion
- Kg to Stone Calculator — Convert kilograms back to stone and pounds
- BMI Calculator UK — Calculate your Body Mass Index using NHS categories
- Calorie Calculator — Calculate daily calorie needs based on your weight in kg
- Gallons to Litres Calculator
- Inches to Feet Calculator
- Pints to Litres Calculator
How the Lbs to Kg Calculator Works
This calculator uses established health formulas and UK-specific reference ranges to provide useful estimates. While online calculators are helpful for general guidance, they should not replace professional medical advice. Always consult your GP or a qualified health professional for personalised health assessments.
UK health guidelines are published by the NHS, Public Health England, and NICE (National Institute for Health and Care Excellence). This tool aligns with these official guidelines where applicable, providing results relevant to the UK population.
Key Information
The NHS recommends at least 150 minutes of moderate-intensity activity per week for adults, or 75 minutes of vigorous activity. A healthy BMI range for adults is 18.5 to 24.9. The UK Chief Medical Officers advise that both men and women should not regularly drink more than 14 units of alcohol per week. Calorie guidance suggests approximately 2,000 kcal per day for women and 2,500 kcal for men, though individual needs vary.
Example Calculation
A 30-year-old female who is 165cm tall and weighs 65kg would have a BMI of 23.9, which falls within the healthy range. Her estimated Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation would be approximately 1,387 kcal per day, rising to around 1,910 kcal with moderate activity.
Source: Based on NHS and Public Health England guidelines. Last updated March 2026.
Frequently Asked Questions
One pound (lb) is exactly 0.45359237 kilograms. This precise value was agreed internationally in 1959. For practical purposes, use 0.453592 kg per pound.
To convert any pounds figure to kilograms, multiply by 0.453592. For example: 10 lbs = 4.536 kg; 100 lbs = 45.36 kg; 200 lbs = 90.72 kg; 300 lbs = 136.08 kg.
There are exactly 14 pounds in one stone. So to convert stone to pounds, multiply by 14. To convert stone and pounds to kg: multiply the total pounds by 0.453592.
Example: 11 stone 4 lbs = (11 × 14) + 4 = 158 lbs = 158 × 0.453592 = 71.67 kg. The stone is unique to the UK and Ireland; the US uses only pounds for body weight.
150 pounds equals 68.039 kg (150 × 0.453592 = 68.039). In stone and pounds, 150 lbs = 10 stone 10 lbs (10 × 14 = 140, remainder 10). At a height of 5'8" (173 cm), a weight of 150 lbs / 68 kg gives a BMI of approximately 22.7, which is within the healthy range of 18.5–24.9.
The NHS officially uses kilograms for all clinical measurements including BMI calculations, drug dosing (many medicines are dosed per kg body weight), and nutritional assessments. Patient records store weight in kg and height in cm/metres. However, NHS patient-facing materials and many NHS staff are comfortable with stones and pounds, and some online NHS tools show both metric and imperial. Baby weights are officially recorded in grams/kg, though parents typically describe them in lbs and oz.
There are exactly 16 ounces in one avoirdupois pound. Since 1 lb = 453.592 grams, 1 ounce = 453.592 ÷ 16 = 28.3495 grams. This is the ounce used for everyday weight measurement (not the troy ounce of 31.1035 grams used for precious metals). So 8 oz = 226.8 grams; 12 oz = 340.2 grams; 16 oz = 453.6 grams (1 lb).
According to NHS and ONS data, the average UK adult weight is approximately 83.6 kg (184 lbs / 13 stone 2 lbs) for men and approximately 70.2 kg (155 lbs / 11 stone 1 lb) for women. Average UK adult height is 175.3 cm (5'9") for men and 161.6 cm (5'3.6") for women. These averages have increased significantly since the 1990s due to rising rates of overweight and obesity.
The average UK full-term newborn weighs approximately 3.3 kg (7 lbs 4 oz). The normal range is 2.5 kg to 4.5 kg (5 lbs 8 oz to 9 lbs 14 oz). Babies under 2.5 kg are classed as low birth weight and receive additional monitoring. Despite NHS official recording in grams and kg, British parents almost universally describe birth weights in lbs and oz. "7 lb 6 oz" is a typical birth announcement weight in the UK.
The UK officially uses kilograms as the legal unit of weight measurement under the Weights and Measures Act 1985. However, in daily life, most British people use a mix of both systems. Body weight is typically discussed in stones and pounds, while food packaging and medical records use kilograms and grams.
Road signs show distances in miles, but goods are sold in metric. This dual-system usage is unique to the UK and is sometimes called the "metrication muddle."
The UK began transitioning from imperial to metric measurements in the 1960s under the Metrication Board. While industry, science, and trade moved to metric, everyday habits proved harder to change. The government allowed continued use of imperial units for certain purposes, and the 2001 EU directive permitted dual labelling.
As a result, British people grew up with both systems: metric in schools and shops, but imperial for body weight, height, and distances. This dual usage persists in 2025/26, making lbs-to-kg conversion an essential everyday skill for UK residents.
UK doctors and the NHS use kilograms exclusively for clinical purposes. All medical calculations including BMI, medication dosing (which is often calculated per kilogram of body weight), anaesthesia doses, and nutritional assessments are done in kilograms. The NHS Digital systems record patient weight in kg. However, GPs are trained to convert from stones and pounds, as most British patients describe their weight this way during consultations.
One stone equals exactly 6.35029318 kilograms, or approximately 6.35 kg. This is because 1 stone = 14 pounds, and 14 x 0.45359237 kg = 6.35029318 kg. Common stone-to-kg conversions: 8 stone = 50.80 kg, 10 stone = 63.50 kg, 12 stone = 76.20 kg, 14 stone = 88.90 kg, 16 stone = 101.60 kg, 20 stone = 127.01 kg. For more detail, see our stone to kg converter.
According to NHS and Office for National Statistics (ONS) data, the average weight for a UK adult male is approximately 83.6 kg (184 lbs / 13 stone 2 lbs). For UK adult females, the average is approximately 70.2 kg (155 lbs / 11 stone 1 lb). These figures have risen steadily since the 1990s, reflecting increasing rates of overweight and obesity across the UK population. You can check if your weight falls within a healthy range using our BMI calculator.
Most UK gyms use metric (kg) weight plates as standard. Olympic barbells, dumbbells, and weight machines in British gyms are typically marked in kilograms. However, many gym-goers — especially those influenced by American fitness content on YouTube and social media — also think and communicate in pounds.
Some UK gyms display both kg and lbs on machines. The standard Olympic barbell in UK gyms weighs 20 kg (44.09 lbs).
To convert baby weight from lbs and oz to kg: first convert everything to pounds (divide ounces by 16 and add to pounds), then multiply by 0.453592. For example, a baby weighing 7 lbs 6 oz: 6 / 16 = 0.375, so 7.375 lbs x 0.453592 = 3.345 kg. Common UK baby weights: 6 lbs = 2.72 kg, 7 lbs = 3.18 kg, 7 lbs 4 oz = 3.29 kg (UK average), 8 lbs = 3.63 kg, 9 lbs = 4.08 kg. Or simply use the calculator at the top of this page.
UK airline luggage limits are stated in kilograms. Common hold luggage allowances: 15 kg (33 lbs), 20 kg (44 lbs), 23 kg (51 lbs), or 32 kg (71 lbs) depending on the airline and fare class. Cabin baggage is typically limited to 7-10 kg (15-22 lbs).
British Airways allows 23 kg per checked bag in economy. Budget airlines like Ryanair and easyJet charge extra for hold luggage, usually starting at 15 kg or 20 kg allowances. Always check your airline's current policy before packing.
12 stone equals exactly 76.2 kg. The calculation is: 12 × 6.35029 = 76.203 kg. In pounds, 12 stone = 168 lbs. At a height of 5'7" (170 cm), this weight gives a BMI of approximately 26.4, placing you in the overweight range (25–29.9). Use our BMI calculator to check against your actual height.
70 kg equals 11 stone 0.3 lbs, which is commonly described as "just over 11 stone." The calculation: 70 ÷ 6.35029 = 11.023 stone. Multiply the decimal (0.023) by 14 to get remaining lbs: 0.023 × 14 = 0.3 lbs. In total pounds, 70 kg = 70 × 2.20462 = 154.32 lbs.
The BMI formula used by the NHS is: BMI = weight (kg) ÷ height (m)². For example, if you weigh 75 kg and are 1.75 m tall: BMI = 75 ÷ (1.75 × 1.75) = 75 ÷ 3.0625 = 24.5 — healthy range (18.5–24.9). You must first convert pounds to kg and feet/inches to metres. Our calculator above handles this instantly. Use our BMI calculator UK for a full assessment including NHS weight categories.