Reference for one unit; displayed values may be rounded.
Pounds
Use a dot or comma for decimals, without thousands separators.
Kilograms
Display rounding does not improve the accuracy of your original measurement. Very large or very small results use scientific notation.
Method and sourceChoose an example to fill the tool. Results use the displayed formula and are rounded for display.
NIST SP 811 — international foot / SI unitslb → kg — Worked examples
Choose an example to fill the tool. Results use the displayed formula and are rounded for display.
lb to kg Conversion Formula
To convert pounds to kilograms, multiply the pound value by 0.453592. The international avoirdupois pound is legally defined as exactly 0.45359237 kilograms.
Pounds and Kilograms Explained
Pounds (lb)
A pound (lb) is the primary weight unit of the US customary and imperial systems. One international avoirdupois pound is legally fixed at exactly 0.45359237 kg, making it just under half a kilogram. It divides into 16 ounces and stacks up 14 times to make one stone. Everyday American weights — a 5 lb bag of sugar, a 150 lb adult, a 50 lb suitcase — all live comfortably in the pound scale.
Where it is used: Pounds are used for nearly all daily weighing in the United States, and they persist in the UK, Canada, and Australia for body weight and in combat sports, horse racing, and aviation fuel loads.
Origin: The pound traces back to the Roman libra (the origin of the lb symbol) and passed through many local variants until the 1959 international agreement pinned it at exactly 0.45359237 kg.
Kilograms (kg)
A kilogram (kg) is the base unit of mass in the metric system and the International System of Units. It equals 1,000 grams — roughly the mass of a liter of water or a pineapple — and anchors the scale on which humans, animals, and luggage are weighed worldwide. Because metric units shift by powers of ten, converting a kilogram to grams, milligrams, or metric tons never requires awkward fractions.
Where it is used: Kilograms are the default weight unit in science, medicine, pharmacy, Olympic weightlifting, and everyday commerce across nearly every country outside the United States.
Origin: Introduced by revolutionary France in the 1790s as the mass of a liter of water, the kilogram was redefined in 2019 using the Planck constant, ending its dependence on a physical prototype.
Pounds to Kilograms Conversion Table
Select a value to use it in the calculator.
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 0.226796185 kg | |
| 0.45359237 kg | |
| 0.90718474 kg | |
| 2.26796185 kg | |
| 4.5359237 kg | |
| 6.80388555 kg | |
| 9.0718474 kg | |
| 11.33980925 kg | |
| 13.6077711 kg | |
| 18.1436948 kg | |
| 22.6796185 kg | |
| 34.01942775 kg | |
| 45.359237 kg | |
| 56.69904625 kg | |
| 68.0388555 kg | |
| 79.37866475 kg | |
| 90.718474 kg | |
| 113.3980925 kg | |
| 136.077711 kg |
Kilograms to Pounds Conversion Table
| Kilograms (kg) | Pounds (lb) |
|---|---|
| 1 kg | 2.2046226218 lb |
| 2 kg | 4.4092452437 lb |
| 5 kg | 11.0231131092 lb |
| 10 kg | 22.0462262185 lb |
| 20 kg | 44.092452437 lb |
| 30 kg | 66.1386786555 lb |
| 50 kg | 110.2311310924 lb |
| 70 kg | 154.3235835294 lb |
| 80 kg | 176.3698097479 lb |
| 100 kg | 220.4622621849 lb |
| 150 kg | 330.6933932773 lb |
Pounds to Kilograms in Everyday Objects
Common real-world examples that make Pounds and Kilograms easy to picture at a glance.
| Pounds (lb) | Kilograms (kg) | |
|---|---|---|
| A gallon of milk | 8.5 lb | 3.855535145 kg |
| A house cat | 10 lb | 4.5359237 kg |
| A microwave oven | 30 lb | 13.6077711 kg |
| A bag of dog food | 35 lb | 15.87573295 kg |
| A checked suitcase | 40 lb | 18.1436948 kg |
| A bag of cement mix | 50 lb | 22.6796185 kg |
| A flat-screen TV | 60 lb | 27.2155422 kg |
When You Need Pounds to Kilograms Conversions
Cross-Border Baggage Limits
US carriers cap checked bags at 50 lb while international partners quote 23 kg. Converting 50 lb to 22.68 kg shows the two limits are not identical — pack to 22.5 kg to be safe on both sides of the ticket.
Fight-Week Weight Cuts
MMA and boxing commissions weigh athletes in pounds, but sports doctors track hydration in kilograms. A 155 lb lightweight converts to 70.31 kg, the figure medical staff record on fight-night physicals.
Metric Medication Dosing
Drug dosages are prescribed in mg per kg of body weight. A 185 lb patient is 83.91 kg, and that converted figure feeds every calculation from anesthesia induction to antibiotic course loads.
Cooking a British Roast in Europe
Classic UK recipes often list the joint in pounds while continental butchers sell by the kilogram. A 3 lb rib of beef converts to 1.36 kg, so a 1.5 kg cut from the counter is slightly more than the recipe needs.
Related Weight Conversions
How to Use
-
1
Enter Your Weight in Pounds
Type the pound value — for example, enter 165 for a 165 lb body weight
-
2
See the Kilogram Result
The result appears instantly: 165 lb = 74.843 kg — your weight in the metric system
-
3
Copy or Reverse
Copy the result or click Swap to convert kilograms back to pounds
-
4
Use the Conversion Table
Check the table for common values like 10 lb = 4.536 kg or 150 lb = 68.039 kg
Why Use Be Converter?
Instant Weight Conversion
Get precise pound to kilogram results in real-time as you type — perfect for gym workouts and meal planning
Medical-Grade Precision
Uses the exact international standard of 0.45359237 kg per pound for results you can trust in any context
Weight Reference Table
Common pound values at a glance — from 1 lb to 300 lb — for fitness, shipping, and cooking
Swap Instantly
Toggle between pounds and kilograms with one click — ideal for reading international fitness content
Free & Unlimited
No account needed. Convert as many weights as you need — always free, no restrictions
Fully Private
All calculations run locally in your browser. Your weight data never leaves your device
Frequently Asked Questions
How many kilograms are in 1 pound?
How do I convert my body weight from pounds to kg?
What is 150 pounds in kilograms?
How do I convert plate weights at the gym from lb to kg?
Is 1 kg more than 1 pound?
What is 200 lb in kilograms?
How many kg is 135 lb in boxing?
Is dividing pounds by 2.2 the same as converting to kg?
About Pounds to Kilograms Converter
Our free online pounds to kilograms converter provides instant, accurate weight conversions for any purpose. Whether you are tracking your fitness progress with a program from another country, calculating medication dosages, determining shipping weights for international parcels, or following a recipe with metric measurements, this tool delivers reliable results. The pound is the primary weight unit in the United States, while kilograms are the global standard used by 195 countries worldwide.
Expert Tips for lb to kg Conversion
The exact conversion is 1 lb = 0.45359237 kg, established by the 1959 international agreement. For everyday use, 0.4536 or even 0.454 is sufficiently precise.
For gym use, note the difference between US and international plates: a US 45 lb barbell plate is 20.41 kg, while an international competition plate is exactly 20 kg (44.09 lb). Over multiple plates, this 0.41 kg difference adds up.
In aviation, baggage allowances are typically 50 lb (22.68 kg) for US domestic or 23 kg (50.71 lb) for international. Always check which unit your airline uses.
For newborns, birth weight in the US is recorded in pounds and ounces. A 7 lb 8 oz baby weighs 7.5 × 0.453592 = 3.402 kg. The global average birth weight is about 3.4 kg (7.5 lb).
In the kitchen, a pound of butter (453.6 g) is slightly less than 500 g (a common metric butter package in Europe). When a US recipe calls for 1 lb of an ingredient, using 450 g is close enough for most cooking.
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