Question 1

What is dimensional weight?

Accepted Answer

Shipping weight based on package size, not actual weight. DIM weight = L×W×H ÷ factor (139 domestic, 166 international).

Question 2

Why do shippers use dimensional weight?

Accepted Answer

Large, light packages take up space. Carriers charge by whichever is greater: actual or dimensional weight.

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.

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