Roll 4d8

Rolling 4d8 means rolling four eight-sided dice and adding them, for a total from 4 to 32 with an average of 18. 18 is also the most likely total at 8.4%. In D&D 5e you roll 4d8 for Shatter or Thunderwave in a 3rd-level slot, a 2024 Cure Wounds at 2nd level, and damage cantrips at level 17.

Bonus

d20 3D dice Dice colour

4d8 added together

4d8 ranges from 4 to 32, averages 18, and is most likely to total 18.

Total	Chance	This or higher
4	0.02%	100%
5	0.1%	99.98%
6	0.24%	99.88%
7	0.49%	99.63%
8	0.85%	99.15%
9	1.37%	98.29%
10	2.05%	96.92%
11	2.93%	94.87%
12	3.93%	91.94%
13	4.98%	88.01%
14	6.01%	83.03%
15	6.93%	77.03%
16	7.69%	70.09%
17	8.2%	62.4%
18	8.4%	54.2%
19	8.2%	45.8%
20	7.69%	37.6%
21	6.93%	29.91%
22	6.01%	22.97%
23	4.98%	16.97%
24	3.93%	11.99%
25	2.93%	8.06%
26	2.05%	5.13%
27	1.37%	3.08%
28	0.85%	1.71%
29	0.49%	0.85%
30	0.24%	0.37%
31	0.1%	0.12%
32	0.02%	0.02%

Where you roll 4d8 in D&D

Upcast spells: Several d8 spells land on 4d8 when you use a bigger slot. Shatter in a 3rd-level slot is 4d8 (18 on average), up from the base 3d8. Thunderwave starts at 2d8 and also hits 4d8 in a 3rd-level slot, and Spirit Guardians reaches 4d8 in a 4th-level slot. On the healing side, the 2024 Cure Wounds adds 2d8 per slot level, so a 2nd-level casting heals 4d8 + your modifier. Under the 2014 rules you needed a 4th-level slot for the same 4d8.

Cantrips at level 17: Sacred Flame, Ray of Frost, Shocking Grasp and other d8 cantrips get their fourth die at level 17. That is 18 damage on average from a spell that costs nothing, which is why cantrips stay relevant at the top levels even next to 9th-level slots.

Monsters: A wraith's Life Drain deals 4d8 + 3 necrotic (21 on average) and lowers the target's hit point maximum by the damage taken, so a long fight against one wears the whole party down. The winter wolf breathes a 15-foot cone of 4d8 cold, and a CR 1 copper dragon wyrmling breathes a line of 4d8 acid that can drop a 1st-level wizard who fails the save. On 4d8 you roll 25 or more 8.06% of the time and 18 or more 54.2% of the time.

Roll 4d8 FAQ

What is the average of 4d8?

The average of 4d8 is 18. Each d8 averages 4.5, and four of them add up to 18.

How much damage does a 3rd-level Shatter do?

Shatter cast with a 3rd-level slot deals 4d8 thunder damage, an average of 18, or half on a successful Constitution save.

What is the most likely roll on 4d8?

18 is the most likely total on 4d8, with an 8.4% chance. 17 and 19 are close behind. Rolling the maximum of 32 has a 1 in 4,096 chance.

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Shatter 5e
Spirit Guardians 5e

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