Lbs to Kg

Pounds to Kilograms Conversion Formula

To convert pounds to kilograms, use this simple formula:

The pound is defined as exactly 0.45359237 kilograms, so dividing pounds by 2.20462 gives approximately the same result.

Step-by-Step Weight Conversion Guide

1. Take your weight in pounds
2. Multiply it by 0.45359237 (the number of kilograms in one pound)
3. Get your result in kilograms

Common Pounds to Kilograms Conversions

Practical Applications of Lbs to Kg Converter

• Body weight: Converting your weight from US scales to metric — 150 lbs is 68.04 kg
• Fitness: Gym plates and dumbbells marked in pounds vs kilograms
• Travel: Checking US baggage limits against metric airline rules
• Shipping: International parcel weights and customs declarations
• Cooking: American recipes with ingredients listed in pounds
• Health: Medical records when moving between countries

History of Weight Measurement Systems

The pound (from Latin "libra pondo", hence the abbreviation "lb") has been used since Roman times and today is the everyday weight unit in the United States. Since 1959 the international avoirdupois pound is defined as exactly 0.45359237 kg. The kilogram is the base unit of mass in the metric system used by most of the world; since 2019 it has been defined via the Planck constant.

Quick Conversion Tips

For quick approximations, remember: 1 lb ≈ 0.45 kg. To convert pounds to kilograms in your head, divide the number by 2 and subtract 10%: 150 lbs → 75 − 7.5 = 67.5 kg (exact: 68.04 kg). For precise results, always use the exact factor of 0.45359237.