🎲 D8 Dice Roller
Roll an 8-sided die online for weapon damage and RPG rolls.
—
Click ROLL to start
About D8 Dice Roller Dice
Roll an 8-sided die online for weapon damage and RPG rolls.
Use this free online dice roller anytime — perfect for online gaming sessions, when you've lost your physical dice, or for quick decisions. Works on all devices with no download required.
Frequently Asked Questions — D8 Dice Roller
Complete guide to the D8 eight-sided octahedron die
What is a D8 die?
A D8 is an 8-sided octahedral die, one of the standard polyhedral dice in tabletop RPGs. It has 8 equilateral triangular faces numbered 1-8. It's used for weapon damage, hit dice for certain classes, and various spell effects.
What weapons deal D8 damage in D&D 5e?
In D&D 5e, weapons dealing 1D8 damage include the longsword (versatile 1d8/1d10), rapier, warhammer, and morningstar. Heavy crossbows deal 1d10, while the longsword in one hand deals D8, making it one of the most common damage dice.
What classes use D8 hit dice?
In D&D 5e, the Cleric, Druid, Monk, and Rogue all use D8 for their hit dice. This gives them medium durability — tougher than Wizards (D6) but not as hardy as Fighters (D10) or Barbarians (D12).
What is the average of a D8 roll?
The average roll on a D8 is 4.5. With outcomes 1 through 8 each having a 12.5% probability, the expected value is (1+2+3+4+5+6+7+8)/8 = 36/8 = 4.5.
What shape is a D8?
A D8 is an octahedron, one of the five Platonic solids. It has 8 equilateral triangular faces, 12 edges, and 6 vertices. It looks like two square pyramids joined at their bases.
What spells use D8 in D&D?
Many healing and damage spells use D8: Cure Wounds heals 1d8 + modifier, Inflict Wounds deals 3d10 but many channeled spells use D8, Fireball deals 8d6, and many weapon-scaling spells use D8 as their damage die.
How does a D8 compare to D6 and D10?
The D6 averages 3.5, the D8 averages 4.5, and the D10 averages 5.5. When upgrading weapon damage (like gaining Great Weapon Master), moving from D8 to D10 adds an average of 1 damage per hit, which is significant over many attacks.
Can I use a D8 for percentile rolls?
Not directly, but you can use two D8s for an octal system. For percentile (1-100) rolls, use a D10 and D10% (or D100). However, D8 can be used for random tables with 8 options, which is common in dungeon master resources.
What is the probability of rolling a specific number on a D8?
The probability of rolling any specific number on a D8 is 1/8 = 12.5%. All 8 outcomes are equally likely on a fair die.
How many D8s do I need for a typical RPG session?
Most players need 2-4 D8s. Rogues and Rangers rolling sneak attack damage can benefit from multiple D8s (Sneak Attack scales to 10d6 at level 20, but many damage rolls use D8). A full dice set typically includes 1-2 D8s.