How many kg is 1 pound?

1 pound equals approximately 0.453592 kilograms. For quick mental math, divide pounds by 2.2 to get kilograms.

How do I convert my weight from lbs to kg?

Multiply your weight in pounds by 0.453592. For example, 150 lbs × 0.453592 = 68.04 kg. Or simply divide by 2.2 for an approximation.

Why do some countries use pounds and others kilograms?

The kilogram is the standard unit in the metric system used by most countries. Pounds are part of the imperial system still used in the US for everyday measurements, though scientific and medical fields often use kilograms.

Pounds to Kilograms Converter

Convert pounds (lbs) to kilograms (kg) with our free online calculator. Essential for fitness tracking, international shipping, medical records, and everyday weight conversions.

Conversion Formula

Conversion	Formula	Example
lbs to kg	lbs × 0.453592	150 lbs = 68.04 kg
kg to lbs	kg × 2.20462	70 kg = 154.32 lbs

Quick Reference Table

Pounds	Kilograms	Common Reference
100 lbs	45.36 kg	Light adult
120 lbs	54.43 kg	Average female
150 lbs	68.04 kg	Average adult
180 lbs	81.65 kg	Average male
200 lbs	90.72 kg	Larger adult
250 lbs	113.40 kg	Heavy adult

Medical Weight Conversions

Healthcare often requires precise weight measurements:

Lbs	Kg	Clinical Note
1 lb	0.454 kg	Drug dosing precision
2.2 lbs	1 kg	Easy conversion factor
10 lbs	4.54 kg	Weight loss milestone

Fitness Weight Plates

Imperial	Metric Equivalent
2.5 lbs	1.13 kg
5 lbs	2.27 kg
10 lbs	4.54 kg
25 lbs	11.34 kg
45 lbs	20.41 kg

Conversion Code Example

``javascript function lbsToKg(lbs) { return lbs * 0.453592; }

function kgToLbs(kg) { return kg * 2.20462; }

// Examples console.log(lbsToKg(150)); // 68.0388 console.log(kgToLbs(70)); // 154.324``

International Shipping

Weight limits vary by carrier:

Carrier	Max Weight	In kg
USPS Priority	70 lbs	31.75 kg
UPS Ground	150 lbs	68.04 kg
FedEx Ground	150 lbs	68.04 kg
International Air	50 lbs typical	22.68 kg

Use this converter for accurate weight conversions between pounds and kilograms.

How Many Decimals Do You Need?

Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 lb with the factor truncated at each decimal place:

Decimals kept	Factor	137 lb becomes	Error
0	0	0	100.0000%
1	0.5	68.5	10.2311%
2	0.45	61.65	0.7920%
3	0.454	62.198	0.0899%
4	0.4536	62.1432	0.0017%

A rule that holds for any conversion: round once, at the end. Rounding the factor and then multiplying compounds the error through every subsequent calculation, while carrying full precision and rounding the final answer does not.

The right number of significant figures is set by your input, not by the converter. If you measured pounds to three significant figures, the answer in kilograms is only good to three — writing more digits claims precision the measurement never had.

Other Conversions From Pounds

The same value in every other unit this converter supports for weight:

From	To	Unit
1 lb	453.592 g	Grams
1 lb	453,592.37 mg	Milligrams
1 lb	16 oz	Ounces
1 lb	0.0714286 st	Stone
1 lb	4.5359e-4 t	Tons

Chaining conversions works — pounds to metres to feet gives the same answer as pounds to feet — but each step rounds, so a chain of three conversions carries three roundings. Convert directly where a direct factor exists.

Pounds to Kilograms Converter