Pounds to kilograms
kg = lb × 0.45359237
Exact factor, set by the 1959 international agreement.
Convert kg to lbs (and lbs to kg)
Two-way kilograms ↔ pounds converter: exact factor (1 lb = 0.45359237 kg), formula, mental-math shortcut, stones and real-world examples (body weight, checked baggage, gym plates).
Conversion table
| kg | lb |
|---|---|
| 1 kg | 2.20462 lb |
| 2 kg | 4.40925 lb |
| 5 kg | 11.0231 lb |
| 10 kg | 22.0462 lb |
| 20 kg | 44.0925 lb |
| 50 kg | 110.231 lb |
| 100 kg | 220.462 lb |
| 1,000 kg | 2,204.62 lb |
| lb | kg |
|---|---|
| 1 lb | 0.4536 kg |
| 2 lb | 0.9072 kg |
| 5 lb | 2.26796 kg |
| 10 lb | 4.53592 kg |
| 20 lb | 9.07185 kg |
| 50 lb | 22.6796 kg |
| 100 lb | 45.3592 kg |
| 1,000 lb | 453.592 kg |
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How does this tool work?
This converter turns kilograms into pounds (lb or lbs) and pounds into kilograms: type a value in either field and the other updates instantly. Use it to read a body weight from a metric scale or a European medical record, to check a baggage allowance quoted in kilograms, to translate the load on an Olympic barbell or to weigh a parcel for international shipping.
The pound used here is the international avoirdupois pound, fixed by the 1959 international yard and pound agreement: 1 lb = 0.45359237 kg exactly. It follows that 1 kg ≈ 2.20462 lb. The kilogram itself, the SI base unit of mass, has been defined from the Planck constant since 2019.
To go from kilograms to pounds, divide by 0.45359237 (or multiply by 2.20462); to go from pounds to kilograms, multiply by 0.45359237. Both fields stay in sync, and the double arrow swaps the direction without losing the value you typed.
For a quick estimate, double the kilograms and add 10%: 70 kg → 140 + 14 = 154 lb (exact value 154.32). The other way, halve the pounds and take away 10%: 160 lb → 80 − 8 = 72 kg (exact value 72.57).
In the UK and Ireland, body weight is often given in stones: 1 stone = 14 lb = 6.35029318 kg. "11 st 4 lb" therefore means 158 lb, about 71.67 kg. Don't confuse the avoirdupois pound with the troy pound (12 troy ounces, about 373.24 g), which survives only in precious-metal trading.
How to use this tool
Enter a weight
Type the value in the Kilograms or Pounds field; decimals are accepted (for example 72.5).
Read the result
The other field shows the conversion with the exact factor, without intermediate rounding.
Use the table
The table below the converter lists values from 1 to 1,000 in both directions, handy for a series of weights.
Kg ↔ pounds conversion formulas
The international pound is defined exactly in terms of the kilogram.
Kilograms to pounds
lb = kg ÷ 0.45359237 ≈ kg × 2.20462
The factor 2.20462 is rounded to five decimal places.
Stones to kilograms
kg = (st × 14 + lb) × 0.45359237
One stone is 14 pounds, or 6.35029318 kg.
- kg
- mass in kilograms (SI base unit)
- lb
- mass in international avoirdupois pounds (1 lb = 16 oz)
- st
- mass in British stones (1 st = 14 lb)
Example: 65 kg = 65 ÷ 0.45359237 ≈ 143.30 lb, or 10 st 3.3 lb.
Use cases
Health and fitness
Understand a weight recorded in kilograms by a doctor, a smart scale or a fitness app used abroad.
Air travel
Check that a suitcase meets an allowance quoted in kilograms (23 kg checked, often 7 to 10 kg for cabin bags) before you reach the airport.
Strength training
Convert the loads in a gym with kilogram plates, or compare a lift with competition results published in kg.
Shipping and e-commerce
Compare product weights and international shipping rates expressed in the other system.
Examples
Body weight
70 ÷ 0.45359237 ≈ 154.32 lb, what a scale set to pounds would show.
Input
70 kgResult
154.32 lbChecked baggage
The standard European allowance is the same as the 50 lb limit of US airlines (50 lb = 22.68 kg).
Input
23 kgResult
50.71 lbGym plates
An Olympic 20 kg plate is slightly lighter than a 45 lb plate (45 lb = 20.41 kg).
Input
20 kgResult
44.09 lbWeight in stones
11 × 14 + 4 = 158 lb, then 158 × 0.45359237 ≈ 71.67 kg.
Input
158 lb (11 st 4 lb)Result
71.67 kgParcel abroad
15 ÷ 0.45359237 ≈ 33.07 lb, to compare with a courier's weight bands.
Input
15 kgResult
33.07 lbTips and best practices
- Quick reference: 1 kg ≈ 2.2 lb and 1 lb ≈ 0.45 kg, a little under half a kilo.
- "lb" comes from the Latin libra; "lbs" is just a common plural, the value is the same.
- For stones and pounds, convert everything to pounds first (stones × 14 + pounds), then to kilograms.
- For recipes and small weights, the pounds ↔ grams converter is easier to read.
- A scale measures mass, so the kg ↔ lb conversion is the same everywhere, whatever the local gravity.
Sources and references
Frequently asked questions
How many pounds are in a kilogram?
One kilogram is about 2.20462 pounds. The exact value follows from the definition 1 lb = 0.45359237 kg, set in 1959.
How many kg is one pound?
One pound is exactly 0.45359237 kg, or 453.59237 grams. For example, 200 lb is 90.72 kg.
How do I convert kg to lbs?
Divide the kilograms by 0.45359237, or multiply by 2.20462. For example, 80 kg is about 176.37 lb.
How many kg is a stone?
A stone is 14 pounds, exactly 6.35029318 kg. So 12 stone is about 76.20 kg.
Is 1 kg exactly 2.2 pounds?
No, 2.2 is a rounded value. One kilogram is 2.20462 lb, so using 2.2 understates the result by about 0.2%: 100 kg is 220.46 lb, not 220 lb.
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