How to Convert Pounds to Kilograms (lbs to kg)

The Pounds to Kilograms Formula

The pound (lb) is the primary unit of weight in the imperial system, while the kilogram (kg) is the base unit of mass in the metric system. The exact conversion is:

1 pound = 0.453592 kilograms

To convert pounds to kg: multiply by 0.453592. To convert kg to pounds: multiply by 2.20462.

Quick Reference Table

• 1 lb = 0.454 kg
• 5 lbs = 2.268 kg
• 10 lbs = 4.536 kg
• 50 lbs = 22.68 kg
• 100 lbs = 45.36 kg
• 150 lbs = 68.04 kg
• 200 lbs = 90.72 kg

Common Use Cases

Body weight: If you weigh 154 lbs, that's 70 kg. If someone says they weigh 80 kg, that's about 176 lbs.

Gym and fitness: A 45-lb barbell plate is about 20.4 kg. A 25-lb dumbbell is roughly 11.3 kg.

Cooking and shipping: Recipe ingredients or package weights are often listed in one system and need converting for international use.

A Quick Mental Shortcut

To roughly convert kg to pounds in your head, multiply by 2 and add 10%. So 70 kg × 2 = 140, plus 10% (14) = 154 lbs. This gives a result within about 0.2% of the exact answer.

For exact conversions, use our free weight converter.