lbs to kg Converter — Measurement Converter

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.

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

The formula

Each unit has a fixed value in kilograms, so converting goes through the kilogram once:

Conversion

result = value × factor_from ÷ factor_to

Where:

value = the number you typed
factor_from = the “from” unit’s value in kilograms
factor_to = the “to” unit’s value in kilograms

Worked example

Convert 150 pounds to kilograms.

Step 1 · The factor

1 lb = 0.45359237 kg

Step 2 · Multiply

150 × 0.45359237 = 68.04 kg

So 150 pounds is about 68.0 kilograms.

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

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.

Sources

NIST SP 811 — SI units