Pounds to Kilograms Converter

How to Use This Calculator

1. Enter your weight in pounds.
2. The equivalent in kilograms, grams, and stone is shown instantly.
3. Decimals are supported (e.g. 155.5 lbs).

Formula

Example

Frequently Asked Questions

• How many kilograms are in a pound? ▼
  1 pound (avoirdupois) equals exactly 0.45359237 kilograms. This is an internationally defined exact value established in 1959. For everyday use, 1 lb ≈ 0.454 kg or roughly "just under half a kilogram." Common conversions: 1 lb = 0.454 kg; 5 lb = 2.268 kg; 10 lb = 4.536 kg; 50 lb = 22.68 kg; 100 lb = 45.36 kg; 200 lb = 90.72 kg. The word "pound" comes from the Latin "libra pondo" (a pound by weight), which is why the abbreviation is "lb" (from libra) rather than "p." Do not confuse the avoirdupois pound used for body weight and general goods with the troy pound (12 troy oz = 373.24 g), which is used for precious metals. When someone says they weigh "160 pounds," they mean 160 × 0.45359237 = 72.57 kg.
• How many pounds is 1 kg? ▼
  1 kilogram equals approximately 2.20462262185 pounds. For practical use, 1 kg ≈ 2.205 lb. The conversion factor comes from the exact definition: 1 lb = 0.45359237 kg, so 1 kg = 1/0.45359237 = 2.20462... lb. Common conversions: 1 kg = 2.205 lb; 5 kg = 11.023 lb; 10 kg = 22.046 lb; 50 kg = 110.23 lb; 70 kg = 154.32 lb; 100 kg = 220.46 lb. A quick mental estimate: multiply kilograms by 2.2 to get pounds (close enough for most purposes, with less than 0.25% error). The kilogram is the SI base unit of mass. In the US, body weight is commonly expressed in pounds, while most other countries use kilograms for medical and everyday weight measurements.
• How do I convert 150 lbs to kg? ▼
  150 pounds equals 68.039 kg. Calculation: 150 × 0.45359237 = 68.0388555 kg, rounded to 68.039 kg. This is a weight that appears frequently in sports (lightweight boxing limit is 135 lb ≈ 61.2 kg; welterweight is 147 lb ≈ 66.7 kg; middleweight is 160 lb ≈ 72.6 kg). To convert any pound value to kilograms, multiply by 0.45359237. For a quick mental estimate, divide by 2.2 (150 ÷ 2.2 ≈ 68.2 kg — very close). More reference points: 120 lb = 54.43 kg; 140 lb = 63.50 kg; 160 lb = 72.57 kg; 180 lb = 81.65 kg; 200 lb = 90.72 kg. These conversions are important for medication dosing, sports weight categories, and international travel weight limits.
• How many pounds is 70 kg? ▼
  70 kilograms equals 154.324 pounds. Calculation: 70 × 2.20462262185 = 154.3235835 lb, approximately 154.32 lb. 70 kg is a common reference weight — close to the average adult weight in many countries. In stone (used in UK): 70 kg ÷ 6.35029318 = 11.02 stone, or about 11 stone. Other common kg-to-lb conversions: 50 kg = 110.23 lb; 60 kg = 132.28 lb; 70 kg = 154.32 lb; 80 kg = 176.37 lb; 90 kg = 198.42 lb; 100 kg = 220.46 lb. To convert any kilogram value to pounds, multiply by 2.20462. A quick mental estimate: multiply by 2.2 (70 × 2.2 = 154 lb — only 0.2% off from the exact answer).
• What is stone in pounds and kg? ▼
  One stone equals exactly 14 pounds = 6.35029318 kg. Stone is used almost exclusively in the UK and Ireland for expressing body weight in everyday conversation. For example, someone might say they weigh "12 stone 4" meaning 12 × 14 + 4 = 172 pounds = 78.02 kg. Converting stone to kg: multiply by 6.35; to pounds: multiply by 14. Common stone conversions: 8 st = 112 lb = 50.8 kg; 10 st = 140 lb = 63.5 kg; 11 st = 154 lb = 69.85 kg; 12 st = 168 lb = 76.2 kg; 13 st = 182 lb = 82.55 kg; 14 st = 196 lb = 88.9 kg. Despite being an old imperial unit not used in the US, stone is still very commonly used in British and Irish media, healthcare, and everyday speech for personal weight, though medical records increasingly use kilograms.

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