Pounds to Kilograms Converter (lb → kg)
Converting pounds to kilograms is essential for fitness tracking, international travel, medical dosage calculations, and shipping. One pound equals exactly 0.45359237 kilograms. Our free converter handles the math instantly — type any value in pounds and get the exact kilogram equivalent with up to 12 decimal places of precision.
Conversion Formula & Step-by-Step Method
- Take the weight in pounds (lb)
- Multiply by 0.45359237 (the conversion factor)
- Round the result to your desired precision
- Add the "kg" unit label
Quick Conversion Table
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Frequently Asked Questions
How do I convert pounds to kilograms in my head?
Divide pounds by 2.2 for a rough estimate. For example, 150 lb ÷ 2.2 ≈ 68 kg. For precise conversions, multiply by 0.45359237.
What is the difference between lb and lbs?
Both are the same — "lb" is the singular abbreviation for pound (from Latin libra), and "lbs" is the plural form.
Why do Americans use pounds instead of kilograms?
The US is one of three countries (along with Liberia and Myanmar) that still use the imperial system. Most of the world uses kilograms.
How many kg is 1 pound?
One pound equals exactly 0.45359237 kilograms.
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Standards Reference & Metrological Grounding
Calculations and conversion factors in this guide adhere to NIST Special Publication 811 and BIPM SI brochure definitions. Review our complete institutional standards and sources directory.