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The pound is defined as exactly 453.59237 grams since 1959. The stone (14 lbs) is used in the UK and Ireland for body weight. 1 pound = 16 ounces.
1 pound = 0.453592 kg. For quick mental math: divide pounds by 2.2 to get kilograms. 154 lbs ÷ 2.2 ≈ 70 kg.
100 kg × 2.20462 = 220.46 lbs. Alternatively, multiply kg by 2.2 for a quick approximation.
1 stone = 14 pounds = 6.35029 kg. Used in the UK and Ireland for body weight. "11 stone 4 lbs" means (11×14 + 4) = 158 lbs = 71.67 kg.
Mass (kg, lbs) measures how much matter an object contains — constant everywhere. Weight is the force of gravity on that mass — it differs on the Moon. In everyday use, the terms are interchangeable.
150 pounds equals 68.039 kilograms. To convert pounds to kg, multiply by 0.453592.