Lbs to Kg Converter — Pounds to Kilograms Calculator

What Is a Pounds to Kilograms Converter?

Converting pounds to kilograms is essential for Americans traveling internationally, athletes competing in metric-standard sports, and anyone working with imported products labeled in metric units. The conversion comes up frequently in healthcare settings — European and Asian medical records use kilograms, so expats and travelers often need to convert their known pound-based weight. For fitness enthusiasts, understanding both systems is key since Olympic lifting, CrossFit competitions, and most non-American training programs prescribe loads in kilograms.

The Conversion Formula

The formula to convert pounds to kilograms is:

Kilograms = Pounds × 0.453592

The reverse formula is: Pounds = Kilograms × 2.20462

Pounds to Kilograms Reference Table

Pounds (lbs)	Kilograms (kg)
1 lbs	0.454 kg
5 lbs	2.268 kg
10 lbs	4.536 kg
20 lbs	9.072 kg
50 lbs	22.680 kg
100 lbs	45.359 kg
120 lbs	54.431 kg
130 lbs	58.967 kg
140 lbs	63.503 kg
150 lbs	68.039 kg
160 lbs	72.575 kg
170 lbs	77.111 kg
180 lbs	81.647 kg
190 lbs	86.182 kg
200 lbs	90.718 kg
220 lbs	99.790 kg
250 lbs	113.398 kg
300 lbs	136.078 kg
350 lbs	158.757 kg
400 lbs	181.437 kg

How to Use This Converter

Enter your pounds value in the input field above.
View the result — the kilograms equivalent appears instantly.
For manual conversion, use the formula: Kilograms = Pounds × 0.453592.
Check the reference table above for 20 pre-calculated common values.

Conversion Tips

Divide pounds by 2.2 for a quick mental estimate. 180 lbs / 2.2 = roughly 82 kg (actual: 81.6). Close enough for most everyday situations.
Olympic weightlifting and powerlifting use kilograms worldwide. If you train in a US gym that shows pounds, convert your maxes to kg before entering international competitions or following European programs.
When shipping internationally, carriers charge by the greater of actual weight or dimensional weight - both measured in kg. Converting your package weight to kg before quoting saves back-and-forth with logistics providers.

Related Conversions

All conversions are calculated client-side in your browser. No data is sent to any server. For the authoritative source on unit definitions, see the National Institute of Standards and Technology (NIST).

Frequently Asked Questions

How many kilograms are in a pound?

One pound equals exactly 0.45359237 kilograms. This is the internationally agreed definition — the avoirdupois pound is defined as exactly 0.45359237 kg by international treaty since 1959.

How do I convert my weight from lbs to kg for international travel?

Divide your weight in pounds by 2.205. For example, 165 lbs ÷ 2.205 = 74.8 kg. Most countries outside the US display weight in kilograms, including on airline baggage scales and medical forms.

What is a quick way to estimate lbs to kg in my head?

Divide by 2 and subtract 10% of that result. For example, 180 lbs: 180 ÷ 2 = 90, minus 9 = 81 kg (actual: 81.6 kg). This gives you a close approximation for everyday use.

Why do gym weights sometimes show both lbs and kg?

International gym equipment manufacturers label plates and dumbbells in both units because gyms operate worldwide. Olympic weightlifting and powerlifting competitions use kilograms exclusively, while most American commercial gyms stock pound-denominated plates.

Is a pound the same in every country?

The avoirdupois pound (used in the US, UK, and most English-speaking countries) is standardized at exactly 0.45359237 kg. However, historical 'pound' units varied by region — the troy pound (used for precious metals) is different at 0.3732 kg. When someone says 'pound' today, they almost always mean the avoirdupois pound.

Pounds to Kilograms Converter

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