Whether you're tracking your fitness progress, comparing weight plates at an international gym, or reading a medical chart from another country, converting between kilograms and pounds is a practical everyday skill. The good news: once you know the key conversion factor, it's simple.
The Key Conversion Factor
1 kilogram = 2.20462 pounds. For practical use: multiply kg by 2.2 to get pounds, or divide pounds by 2.2 to get kilograms. A 70 kg person weighs about 154 lbs. A 150 lb person weighs about 68 kg.
The stone (14 lbs = 6.35 kg) is still used in the UK and Ireland for body weight. A "10 stone" person weighs 140 lbs or 63.5 kg.
Gym Weight Conversion
Most commercial gym equipment uses weight stacks in 5 or 10 lb increments. Olympic barbells are 20 kg (45 lbs). Common plate sizes: 25 kg (55 lb), 20 kg (45 lb), 15 kg (35 lb), 10 kg (25 lb), 5 kg (10 lb).
When traveling between countries, knowing these conversions helps you track your lifts. If you bench press 100 kg at home, that's 220 lbs abroad.
BMI and Weight Categories
BMI = weight (kg) ÷ height² (m²). Categories: Underweight < 18.5, Normal 18.5–24.9, Overweight 25–29.9, Obese ≥ 30. For a 1.75 m person: normal weight range is 56.7–76.6 kg (125–169 lbs).
Note: BMI doesn't distinguish between muscle and fat. Athletes with high muscle mass may be classified as "overweight" despite being very fit.
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