kg ポンド変換

One pound is exactly 0.45359237 kg, which makes one kilogram about 2.2046 pounds. Multiplying kilograms by 2.2 gets you close enough for most purposes. Going the other way, halve the pounds and take off ten percent: 100 lb halves to 50, minus 5 gives 45 kg, against a true 45.36 kg. That is a perfectly serviceable bit of mental arithmetic.

The gym is where pounds show up most. The standard American plate is 45 lb, or 20.4 kg, and the barbell itself is also 45 lb. That is why English-language lifting content keeps mentioning 135, 225 and 315 lb — those are the bar with one, two and three plates a side. In kilograms they are 61.2, 102.1 and 142.9. Korean gyms generally stock 20 kg plates, which is why the numbers never line up neatly.

Pounds also turn up in international shipping. American carriers usually quote weight in pounds, so working out customs or postage often means converting to kilograms first. While you are here: an ounce is one sixteenth of a pound, roughly 28.35 g.