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The 45 lb plate is actually 20.4 kg, very close to 20 kg - the international standard. When the US started importing Olympic equipment, 20 kg plates were labeled as 45 lbs rather than creating new 50 lb plates. This made international competition equipment consistent.

Kilograms show smaller numbers for changes, which some find discouraging. Pounds show larger numbers (1 kg lost = 2.2 lbs lost), which can be more motivating. The key is consistency - pick one and stick with it. Many people tracking in pounds find the larger numbers more rewarding psychologically.

23 kg equals 50.7 lbs, so airlines rounded to 50 lbs for US markets. This standardization from the International Air Transport Association makes global travel easier while accommodating both measurement systems. Some airlines allow exactly 23kg, others exactly 50lbs (22.7kg).

For cooking, the 2.2 conversion is usually sufficient. However, for baking, be more precise (2.20462) as small variations can affect results. Also remember that UK/US cups and spoons differ, so weight measurements are actually more reliable for international recipes.

Stone is a British unit equal to 14 pounds or 6.35 kg. It's still commonly used in the UK and Ireland for body weight. So someone weighing 70 kg would be '11 stone' (154 lbs). Medical professionals in the UK now primarily use kilograms.