Convert Kilograms ↔ Pounds

The Conversion Factor

1 kilogram = 2.20462 pounds. For quick mental math: double the kg and add 10%. Example: 70 kg x 2 = 140, plus 10% (14) = 154 lbs. The actual answer is 154.3 — close enough for conversation. Going the other direction: divide pounds by 2.2. 180 lbs / 2.2 = 81.8 kg. The US is one of only three countries (along with Myanmar and Liberia) that does not primarily use the metric system for everyday measurements.

When Precision Matters

For cooking, shipping, and casual use: rounding to the nearest pound or half-kg is fine. For medication dosing, scientific work, and competition weigh-ins: use the exact conversion (1 kg = 2.20462 lbs). In medicine, drug dosages are almost always calculated per kilogram of body weight — a 10% error in weight conversion could mean a 10% error in medication dose. Always confirm the exact weight when medical accuracy matters.