root@generate-random:~/dnd-dice-roller$ _

D&D Dice Roller

Roll D4, D6, D8, D10, D12, D20, D100 for Dungeons & Dragons 5e with preset rolls, advantage, disadvantage, and modifiers

Our D&D dice roller provides instant virtual dice for Dungeons & Dragons 5th Edition with all seven polyhedral dice: D4, D6, D8, D10, D12, D20, and D100. Features D&D presets for ability scores (4d6 drop lowest), attack rolls, damage rolls, advantage, disadvantage, and saving throws. Perfect for online D&D sessions, Roll20, Foundry VTT, and in-person tabletop gaming when you need quick, fair dice rolls.

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What is a D&D Dice Roller?

A D&D dice roller is a virtual tool that simulates rolling all seven polyhedral dice used in Dungeons & Dragons 5th Edition: D4 (4-sided), D6 (6-sided), D8 (8-sided), D10 (10-sided), D12 (12-sided), D20 (20-sided), and D100 (percentile). These dice are the foundation of D&D gameplay, used for everything from ability score generation (4d6 drop lowest) to attack rolls (d20+modifier) to damage rolls (weapon dice plus ability modifier). Our online D&D dice roller replaces physical dice sets, making it perfect for online sessions, in-person games, or solo play.

This D&D dice roller features 10 preset rolls for common D&D situations including Ability Score (4d6 drop 1), Attack Rolls (d20+5), weapon damage for Longsword (d8+3) and Greatsword (2d6+3), spell damage like Fireball (8d6), Sneak Attack (4d6), Initiative (d20+2), Saving Throws (d20+5), Advantage (2d20 keep highest), and Disadvantage (2d20 keep lowest). The tool displays roll history with complete breakdowns showing individual dice, kept/dropped dice for advanced mechanics, and modifiers, making it ideal for Roll20, Foundry VTT, Discord D&D sessions, and tabletop gaming.

D&D Dice Roller Configuration Options

Dice Type (D4-D100)

Select from all seven standard D&D dice types: D4 for daggers and slings, D6 for shortswords and ability scores, D8 for longswords and rapiers, D10 for heavy crossbows, D12 for greataxes, D20 for all checks and attacks, and D100 for percentile rolls on random tables. Click any dice type button to switch instantly between dice sizes.

Number of Dice (1-20)

Roll multiple dice of the same type simultaneously for damage rolls or ability score generation. Common uses include 1d20 for single attacks, 2d6 for greatsword damage, 4d6 for ability score rolling, 8d6 for Fireball damage, or 12d6 for high-level spell damage. All dice are rolled at once and displayed individually.

Modifier (-20 to +20)

Add or subtract modifiers to dice rolls for ability scores, proficiency bonuses, magic items, and situational bonuses. Attack rolls use ability modifier + proficiency, damage rolls use ability modifier, and saving throws use ability modifier + proficiency (if proficient). The tool automatically calculates and displays the final total.

D&D Presets

Choose from 10 common D&D roll presets that automatically configure dice type, count, modifiers, and advanced mechanics. Presets include character creation (ability scores with 4d6 drop lowest), combat (attack rolls, weapon damage), spells (Fireball, Sneak Attack), and special rolls (Advantage, Disadvantage, Initiative, Saving Throws). Click any preset to instantly roll with optimal settings.

Advanced Mechanics

Configure Keep Highest (for Advantage: roll 2d20 keep 1, or Great Weapon Fighting) and Drop Lowest (for Ability Scores: roll 4d6 drop 1, or Disadvantage). These mechanics match official D&D 5e rules and show both kept and dropped dice in the roll history for full transparency. Perfect for implementing class features and conditions.

Roll History (50 rolls)

View your last 10 rolls (of 50 stored) with complete details including individual dice values, kept/dropped dice for advanced mechanics, modifiers applied, and final totals. Color-coded results highlight exceptional rolls: green for totals 20+, cyan for 15-19, red for 5 or less. Clear history button resets all saved rolls.

How to Roll D&D Dice Online

[STEP 1] Select Dice Type

Choose your dice type from D4, D6, D8, D10, D12, D20, or D100 based on what you need to roll. Use D20 for attack rolls and checks, weapon dice (D4-D12) for damage, D6 for ability scores, or D100 for percentile tables. Quick preset buttons automatically select the correct dice for common D&D rolls.

[STEP 1] Configure Roll Parameters

Set the number of dice (1-20) and modifier (-20 to +20). For attack rolls, use 1d20 with your attack bonus. For damage, use your weapon's dice (like 2d6 for greatsword) plus ability modifier. For ability scores, use the Ability Score preset (4d6 drop lowest 1). The tool shows your current roll notation in dice notation format.

[STEP 1] Use Presets or Advanced Mechanics

Click any of the 10 D&D preset buttons for instant rolls: Ability Score, Attack Roll, Longsword, Greatsword, Fireball, Sneak Attack, Initiative, Saving Throw, Advantage, or Disadvantage. Alternatively, expand Advanced Mechanics to manually configure Keep Highest or Drop Lowest for custom mechanics. Presets automatically roll the dice immediately.

[STEP 1] Roll & View Results

Click ROLL DICE to generate your random roll. View the result in the roll history showing individual dice values, kept/dropped dice (if using advanced mechanics), modifier applied, and final total. Each roll is color-coded and numbered. Roll history saves your last 50 rolls for reference during gameplay. Clear history when starting a new session.

D&D Dice Rolling Best Practices

_ Use presets for common rolls - The 10 D&D presets instantly configure optimal settings for ability scores, attacks, damage, advantage, and disadvantage, saving time during gameplay.
_ Roll ability scores with 4d6 drop lowest - This is the most popular ability score generation method in D&D 5e, producing scores averaging 12-13 (higher than 3d6's average of 10.5). Use the Ability Score preset.
_ Apply advantage and disadvantage correctly - Roll 2d20 keep highest for advantage (favorable conditions, flanking) or 2d20 keep lowest for disadvantage (hindering conditions, attacking while prone). Advantage and disadvantage don't stack and cancel each other out.
_ Declare your roll before rolling - State what you're rolling for (attack, skill check, damage) before clicking to maintain transparency, especially important in online D&D games with other players and DMs.
_ Track roll history for combat - The roll history displays your last 10 rolls with full details, perfect for tracking multiple attacks, damage rolls, and saving throws during complex combat encounters.
_ Use the correct damage dice - Each weapon has specific damage dice: D4 for daggers, D6 for shortswords, D8 for longswords/rapiers, D10 for heavy crossbows, D12 for greataxes, 2d6 for greatswords/mauls. The presets include common weapon damage rolls with typical modifiers.

Technical Implementation

Our D&D dice roller uses cryptographically secure random number generation (CSPRNG) to simulate fair, unbiased polyhedral dice rolls equivalent to rolling physical D&D dice. The algorithm implements all D&D 5e mechanics including advantage, disadvantage, ability score rolling, and advanced dice mechanics:

Algorithm: D&D Polyhedral Dice with Advanced Mechanics

1. Initialize: Set dice_type ∈ {d4, d6, d8, d10, d12, d20, d100}
   Extract die_sides from dice_type (4, 6, 8, 10, 12, 20, or 100)
2. Generate: Use CSPRNG to generate num_dice random integers ∈ [1, die_sides]
   Store as rolls[] array
3. Apply Advanced Mechanics:
   - If keep_highest > 0: Sort rolls descending, kept = rolls[0...keep_highest-1]
   - If drop_lowest > 0: Sort rolls ascending, remove lowest drop_lowest values
   - Otherwise: kept = rolls (keep all dice)
4. Calculate:
   roll_total = sum(kept_rolls)
   final_total = roll_total + modifier
   dropped_rolls = rolls - kept_rolls
5. Return: {rolls, kept_rolls, dropped_rolls, modifier, total: final_total}

// D&D Preset Examples:
// Ability Score: 4d6 drop lowest → Keep highest 3, average 12.24
// Advantage: 2d20 keep highest → P(result ≥ x) = (2x-1)/400
// Disadvantage: 2d20 drop highest → P(result ≤ x) = (2x-1)/400
// Fireball: 8d6 → Average 28 damage (range 8-48)

API Access for Developers

GET https://generate-random.org/api/v1/generate/dice?dice_type=d20&num_dice=2&keep_highest=1&modifier=5

VIEW FULL API DOCUMENTATION →

Frequently Asked Questions

What dice do I need for D&D? ▶

A standard D&D dice set includes 7 dice: D4 (4-sided), D6 (6-sided), D8 (8-sided), D10 (10-sided), D12 (12-sided), D20 (20-sided), and D100 (percentile die, or two D10s used as tens and ones). The D20 is the most important die - you'll use it for almost every action including attack rolls, ability checks, and saving throws. Our virtual roller replaces physical dice sets and provides all seven dice types in one tool.

How do I roll with advantage in D&D? ▶

When you have advantage, roll two D20 dice and use the higher result. In our roller, click the "Advantage" preset button which automatically configures 2d20 keep highest, or manually set Number of Dice to 2 and Keep Highest to 1. Advantage significantly increases your chance of success - for example, rolling 11+ on a normal d20 is 50%, but with advantage it jumps to 75%. The tool shows both dice rolled and highlights which die was kept vs. discarded.

What is the 4d6 drop lowest method? ▶

This is the most popular method for generating D&D ability scores. Roll 4 six-sided dice, discard the lowest die, and add the remaining three. This produces scores averaging 12-13 (ranging from 3-18), higher than the 3d6 method which averages 10.5. To use this method, click our "Ability Score" preset button which automatically rolls 4d6 drop lowest. Repeat six times for your six ability scores (Strength, Dexterity, Constitution, Intelligence, Wisdom, Charisma).

How do damage dice work in D&D? ▶

Each weapon and spell uses specific damage dice. When you hit with an attack, roll the weapon's damage dice and add your ability modifier. For example, a longsword deals 1d8+STR modifier damage, while a greatsword deals 2d6+STR modifier. Spells like Fireball deal 8d6 damage (no ability modifier added). On a critical hit (natural 20), you roll double the normal damage dice (but don't double the modifier). Use our preset buttons for common weapon damage rolls, or manually configure any dice combination.