Convert Pounds (lb) to Kilograms (kg)

Q: How many kilograms are in a pound?

1 pound = exactly 0.45359237 kg. For quick mental math, divide pounds by 2.2.

Q: How much is 200 lbs in kg?

200 lbs = 90.72 kg. A commonly searched value in fitness and weight tracking.

1 pound equals 0.453592 kilograms.

Formula: kg = lb × 0.453592

Pound to Kilogram Converter

What Is a Pound?

The pound (lb) is a unit of mass in the US customary and British imperial systems. The international avoirdupois pound is defined exactly as 0.45359237 kilograms, a value established by the 1959 International Yard and Pound Agreement.

What Is a Kilogram?

The kilogram (kg) is the SI base unit of mass. Since 2019, it is defined by the Planck constant. The kilogram is the global standard for mass measurement in science, medicine, commerce, and everyday life.

Pounds to Kilograms Formula

The conversion factor is exact by international agreement:

kilograms = pounds × 0.45359237 exact

This is the precise definition of the international avoirdupois pound.

Worked Example

Convert 150 lbs to kilograms:

Multiply: 150 × 0.45359 = 68.04 kg

Quick Estimation

For mental math, halve the number and subtract 10%. Example: 150 lbs → 75 → 75 − 7.5 = 67.5 kg (exact: 68.04 kg). Or simply divide by 2.2.

When You Need This Conversion

International travel: Airlines show baggage limits in kg. A 50 lb suitcase = 22.7 kg.
Medical records: 150 lbs ≈ 68 kg — needed for medication dosing and BMI calculations abroad.
Sports: Olympic weight classes use kg. A 155 lb fighter competes in the 70 kg division.
Scientific research: SI units are mandatory for peer-reviewed publications.

Frequently Asked Questions

How many kilograms are in a pound?

1 pound = exactly 0.45359237 kg. For quick mental math, divide pounds by 2.2.

How do I quickly estimate lbs to kg?

Halve the number and subtract 10%. Example: 200 lbs → 100 → 100 − 10 = 90 kg (exact: 90.72 kg).

Is body weight reported in lbs or kg internationally?

Most countries use kg. The US uses pounds. The UK uses stones and pounds colloquially, kg in medical contexts.

How much is 200 lbs in kg?

200 lbs = 90.72 kg. A commonly searched value in fitness and weight tracking.

Why do doctors use kilograms instead of pounds?

Medication dosing is calculated per kilogram of body weight (mg/kg). Using kg reduces conversion errors and is the international medical standard.

Is a pound the same everywhere?

The avoirdupois pound (0.45359237 kg) is used in the US, UK, and most English-speaking countries. The troy pound (0.3732 kg) is only used for precious metals. All "pound" references in everyday use mean avoirdupois.

How do I convert pounds to kilograms and grams?

Multiply by 0.45359237 to get kg, then take the decimal part × 1000 for grams. Example: 3.5 lb = 1.588 kg = 1 kg 588 g. Or use our pounds and ounces to kg converter.

Common Pound to Kilogram Conversions

Pound to Kilogram (Part 1)

Pound	Kilogram	Actions
1 pound	0.453592 kilograms
5 pounds	2.26796 kilograms
10 pounds	4.53592 kilograms
50 pounds	22.6796 kilograms
100 pounds	45.3592 kilograms

Pound to Kilogram (Part 2)

Pound	Kilogram	Actions
150 pounds	68.0389 kilograms
180 pounds	81.6466 kilograms
200 pounds	90.7185 kilograms
250 pounds	113.398 kilograms
300 pounds	136.078 kilograms

Pounds to kilograms Conversion Table

Reference table with common pounds to kilograms conversions. All values calculated with high precision.

Pounds to Kilograms Table
0.001 to 5

Pounds	Kilograms	Actions
0.001 lb	0.000453592 kg
0.0025 lb	0.00113398 kg
0.005 lb	0.00226796 kg
0.01 lb	0.00453592 kg
0.025 lb	0.0113398 kg
0.05 lb	0.0226796 kg
0.1 lb	0.0453592 kg
14 lb	0.113398 kg
12 lb	0.226796 kg
1 lb	0.453592 kg
2 12 lb	1.13398 kg
5 lb	2.26796 kg

Pounds to Kilograms Table
10 to 1000000

Pounds	Kilograms	Actions
10 lb	4.53592 kg
25 lb	11.3398 kg
50 lb	22.6796 kg
100 lb	45.3592 kg
250 lb	113.398 kg
500 lb	226.796 kg
1000 lb	453.592 kg
2500 lb	1133.98 kg
5000 lb	2267.96 kg
10000 lb	4535.92 kg
25000 lb	11339.8 kg
50000 lb	22679.6 kg
100000 lb	45359.2 kg
250000 lb	113398 kg
500000 lb	226796 kg
1000000 lb	453592 kg

Kilograms to Pounds Table
0.0001 to 12

Kilograms	Pounds	Actions
0.0001 kg	0.000220462 lb
0.00025 kg	0.000551156 lb
0.0005 kg	0.00110231 lb
0.001 kg	0.00220462 lb
0.0025 kg	0.00551156 lb
0.005 kg	0.0110231 lb
0.01 kg	0.0220462 lb
0.025 kg	0.0551156 lb
0.05 kg	0.110231 lb
0.1 kg	0.220462 lb
14 kg	0.551156 lb
12 kg	1.10231 lb

Kilograms to Pounds Table
1 to 100000

Kilograms	Pounds	Actions
1 kg	2.20462 lb
2 12 kg	5.51156 lb
5 kg	11.0231 lb
10 kg	22.0462 lb
25 kg	55.1156 lb
50 kg	110.231 lb
100 kg	220.462 lb
250 kg	551.156 lb
500 kg	1102.31 lb
1000 kg	2204.62 lb
2500 kg	5511.56 lb
5000 kg	11023.1 lb
10000 kg	22046.2 lb
25000 kg	55115.6 lb
50000 kg	110231 lb
100000 kg	220462 lb

Looking for the reverse? Convert Kilogram to Pound

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Kg to Pounds and Ounces — combined lb + oz format
Kg to Stones and Pounds — UK body weight format

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Conversion factors verified against NIST (National Institute of Standards and Technology), BIPM (International Bureau of Weights and Measures) 1 lb = 0.45359237 kg by international agreement (1959). Last reviewed: March 2026

By Adilson Fernandes

Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.