Calculating Damage. Each weapon, spell, and harmful monster ability specifies the damage it deals.

1. Roll the appropriate damage die or dice. The damage will be a certain type. 

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2. For a melee or ranged weapon attack, add the appropriate ability modifier. 

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3. Add damage due to any magical properties of the weapon or item. Note the damage type.

Damage can also be affected by:

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  • Class features

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Proficiency bonus is not added to damage.

Ability modifier is not added to the damage from the Two-Weapon Fighting bonus attack.

Improvised weapon or unarmed strike damage.

Damage is subtracted from the target's hit points. This has no effect on its capabilities until it drops to 0 hit points.

Knocking a creature out.

Round down on the damage total, even if the fraction is one-half or greater. 

Round down on the damage total, even if the fraction is one-half or greater. 

Round down on the damage total, even if the fraction is one-half or greater.