How much crown molding do I need?

Add up the room's wall lengths (perimeter) and add about 10% for mitre cuts and waste. Buy a little extra to match the profile for future repairs.

How much extra molding should I buy?

About 10% over the perimeter to cover mitre cuts and mistakes — corners waste material, and matching the exact profile later can be hard.

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Linear feet of molding for a room.

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Room perimeter (ft)

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How much crown molding do I need?: Add up the room's wall lengths (perimeter) and add about 10% for mitre cuts and waste. Buy a little extra to match the profile for future repairs.
How much extra molding should I buy?: About 10% over the perimeter to cover mitre cuts and mistakes — corners waste material, and matching the exact profile later can be hard.