Question 1

How many kg in a stone?

Accepted Answer

1 stone = 6.35 kg = 14 lbs. Used in UK/Ireland for body weight. "I weigh 10 stone" = 63.5 kg = 140 lbs.

Question 2

Why does the UK use stone for body weight?

Accepted Answer

Historical tradition. Stone was a standard weight for wool and commodities. Persists for body weight though UK is officially metric.

Question 3

Is there a difference between mass and weight?

Accepted Answer

Yes! Mass (kg) is amount of matter, constant everywhere. Weight (newtons or pounds-force) is gravitational force on mass, varies by location.

Question 4

Why do jewelry and precious metals use different units?

Accepted Answer

Troy system (troy ounces, pennyweights) has been used for precious metals since the Middle Ages. 1 troy oz = 31.1g vs 1 regular oz = 28.35g.

kg to st Converter

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