Convert lbs to kg
Convert pounds to kilograms instantly — exact factors, common-value table, nothing uploaded.
Common conversions
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Pounds to kilograms, shipping labels to doctor charts
Medical dosing, shipping quotes, science classes, Olympic weightlifting — pounds have to become kilograms in all of them. The conversion is exact by definition: 1 lb = 0.45359237 kg, no rounding hidden anywhere.
This page presets the converter to pounds → kilograms. Type 150 and you get 68.0389 kg; type 200 and you get 90.7185 kg — the numbers a medical chart or an international shipping form actually wants.
The quick table below anchors the common values; the converter does everything else as you type, locally in your browser, with no quota and nothing sent anywhere.
Quick conversion table
Common values at a glance — computed locally with exact standard factors.
| Value (lb) | Converted (kg) |
|---|---|
| 1 | 0.453592 |
| 2 | 0.907185 |
| 5 | 2.26796 |
| 10 | 4.53592 |
| 25 | 11.3398 |
| 50 | 22.6796 |
| 100 | 45.3592 |
How to convert lbs to kg
Enter the weight in pounds
Decimal pounds, e.g. 132.5 from a US scale.
Read kilograms
Exact multiplication by 0.45359237, displayed to six significant digits.
Reverse when needed
The swap button flips to kg-to-lbs keeping the value.
FAQs about this conversion
How many kg is 1 pound exactly?
Exactly 0.45359237 kg — this value is part of the international definition of the pound.
What is 180 lbs in kg?
180 lb = 81.6466 kg. A rough check: halve it (90) and take off ten percent (81) — close to the exact figure.
Do doctors use kg for dosing?
Yes — medication dosing is almost universally calculated per kilogram, which is exactly why this conversion needs to be exact rather than approximate.
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