Weight Converter
General
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Formula
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What this converter does
This converter turns pounds into kilograms and back instantly. It also handles grams, tonnes, ounces and stones — every pair uses an exact factor. Type a value, pick your units, and read the result as you type.
One pound equals exactly 0.45359237 kilograms, so to go from pounds to kilograms you multiply by that factor. Unit definitions follow NIST.
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The units it covers
Every mass unit converts through the kilogram with a fixed ratio.
View all units & their values
| Unit | Symbol | Value | Mainly used |
|---|---|---|---|
| Kilogram | kg | 1 | SI base unit |
| Gram | g | 0.001 | Cooking, small items |
| Tonne | t | 1000 | Freight, vehicles |
| Pound | lb | 0.453592 | US/UK body & goods |
| Ounce | oz | 0.0283495 | US recipes, mail |
| Stone | st | 6.350293 | UK body weight |
| US ton | US ton | 907.18474 | US freight |
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The formula
Each unit has a fixed value in kilograms, so converting goes through the kilogram once:
Conversion
result = value × factor_from ÷ factor_toWhere:
- value = the number you typed
- factor_from = the “from” unit’s value in kilograms
- factor_to = the “to” unit’s value in kilograms
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Worked example
Convert 150 pounds to kilograms.
Step 1 · The factor
1 lb = 0.45359237 kgStep 2 · Multiply
150 × 0.45359237 = 68.04 kgSo 150 pounds is about 68.0 kilograms.
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The units in this example
Poundsymbol: lb
The imperial and US customary unit of mass, defined as exactly 0.45359237 kg.
Common weight conversions
- 1 lb = 0.4536 kg
- 1 lb = 16 oz
- 1 lb = 453.59 g
- 1 st = 14 lb
Kilogramsymbol: kg
The SI base unit of mass, used across most of the world for body and goods weight.
Common weight conversions
- 1 kg = 2.2046 lb
- 1 kg = 1,000 g
- 1 kg = 35.274 oz
- 1 kg = 0.1575 st
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FAQ
QHow many kg in 150 pounds?
One hundred fifty pounds is about 68.04 kilograms.
QHow do I convert lbs to kg?
Multiply the pound figure by 0.45359237.
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