How is fall damage calculated in D&D 5e?

At the end of a fall, a creature takes 1d6 bludgeoning damage for every 10 feet fallen, up to a maximum of 20d6 (200 feet). The creature lands prone unless it avoids taking all damage from the fall.

What happens when you fall onto another creature in 5e?

Under Tasha's Cauldron of Everything (p. 67): The creature fallen upon must succeed on a DC 15 Dexterity saving throw. On a failure, the total fall damage is split evenly (50/50) between both creatures, and both fall prone.

Does falling into water negate fall damage in 5e?

Official rulings and the DMG suggest that falling into deep water (at least 10 feet deep) allows an Athletics or Acrobatics check (typically DC 15) to negate the damage from the first 20 feet of the fall, with each additional 10 feet dealing normal 1d6 damage.

D&D 5e Fall Damage Calculator (Distance, Tasha's Split & Water)

Official 5e Falling Damage Rules

Falling in 5e occurs instantly at a rate of 500 feet per round (XGtE p. 77). If you fall from a cliff, bridge, or flying mount, you immediately drop up to 500 feet before having another turn to react.

Fall Distance	Damage Dice	Average Damage	Key Tactical Notes
10 Feet	1d6 bludgeoning	3.5 HP	Lands prone unless taking 0 damage. Minimum damage distance.
30 Feet	3d6 bludgeoning	10.5 HP	Sufficient to knock out most 1st-level adventurers.
100 Feet	10d6 bludgeoning	35.0 HP	Lethal danger zone for mid-level characters.
200+ Feet (Max)	20d6 bludgeoning (Cap)	70.0 HP	Official cap. Even from orbit or a mile high, 5e rules cap at 20d6 (max 120 HP).

D&D 5e Fall Damage & Landing Calculator

Official 5e Falling Damage Rules

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