Convert any value from pounds (lb) to kilograms (kg) or vice versa. Ideal for body weight, food ingredients, package shipping, and more. See step-by-step calculations and precise results.
Convert lb to kg effortlessly with our tool! Whether you’re checking body weight (US uses lb, global uses kg), measuring ingredients (e.g., 1 lb flour = ? kg), or calculating shipping weights, we ensure accuracy. Learn the international standard formula and avoid common conversion mistakes.
The international standard conversion (defined by the 1959 International Yard and Pound Agreement) is: 1 pound (lb) = 0.45359237 kilograms (kg) This is an exact value — no approximation. For daily use, it’s often simplified to 1 lb ≈ 0.4536 kg.
L(kg) = L(lb) × 0.45359237
1. Convert 150 lb (average adult weight) to kg:
L(kg) = 150 lb × 0.45359237 = 68.0388555 kg ≈ 68.04 kg
2. Convert 2 lb (bag of sugar) to kg:
L(kg) = 2 lb × 0.45359237 = 0.90718474 kg ≈ 0.91 kg
For reverse conversion (kg to lb), use: L(lb) = L(kg) ÷ 0.45359237 (or × 2.20462, the inverse factor).
Explore how pounds (lb) and kilograms (kg) relate to other weight units for daily use.
Imperial/US unit
1 lb = 0.45359237 kg
1 lb = 16 ounces (oz)
1 lb ≈ 453.59 grams (g)
Use: Body weight (US), food, packages
Global metric unit
1 kg ≈ 2.20462 lb
1 kg = 1000 grams (g)
1 kg = 35.274 ounces (oz)
Use: Body weight (global), science, trade
Small metric unit
1 g = 0.00220462 lb
1 g = 0.001 kg
1 g = 0.035274 oz
Use: Spices, jewelry, small ingredients
Imperial/US unit
1 oz ≈ 0.0625 lb
1 oz ≈ 0.0283495 kg
1 oz ≈ 28.3495 g
Use: Food portions, liquids (fluid oz)
Quick reference for common pound values to kilograms (precise and simplified) — perfect for daily use.
| Pounds (lb) | Precise Kilograms (kg) | Simplified Kilograms (kg) | Common Use Case |
|---|---|---|---|
| 1 lb | 0.45359237 kg | 0.45 kg | Small produce (e.g., apple) |
| 5 lb | 2.26796185 kg | 2.27 kg | Bag of flour/sugar |
| 10 lb | 4.5359237 kg | 4.54 kg | Small pet (e.g., cat) |
| 50 lb | 22.6796185 kg | 22.68 kg | Child’s weight, luggage |
| 100 lb | 45.359237 kg | 45.36 kg | Light adult weight, large package |
| 150 lb | 68.0388555 kg | 68.04 kg | Average adult weight (US) |
| 200 lb | 90.718474 kg | 90.72 kg | Heavy adult weight, gym equipment |
| 1000 lb | 453.59237 kg | 453.59 kg | Large appliance, livestock |
Answers to common questions about converting pounds to kilograms for daily, fitness, and professional use.
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