Random Number Generator for D&D Dice Rolls
Table of Contents
You forgot your dice bag. The DM is about to call for a perception check. Any random number generator can replace any single die in tabletop RPGs, and a cryptographically secure one is mathematically just as fair as a physical d20.
free random number generator handles single-die rolls of any size. Set max to 20 for a d20, 12 for a d12, 100 for a percentile, and so on.
Die Type → Random Number Settings
| Die | Min | Max | Used For |
|---|---|---|---|
| d4 | 1 | 4 | Daggers, magic missile damage, healing word |
| d6 | 1 | 6 | Most basic damage rolls, fireball |
| d8 | 1 | 8 | Longsword, cleric spells, healing dice |
| d10 | 1 | 10 | Ranger spells, percentile (with d100) |
| d12 | 1 | 12 | Greataxe, paladin smite |
| d20 | 1 | 20 | Attack rolls, ability checks, saving throws |
| d100 | 1 | 100 | Wild magic surge, percent rolls |
For each die type, set min to 1 and max to the die size. our random number generator handles all of them in the same interface.
Multi-Die Rolls (2d6, 3d8, etc.)
This is a single-die generator. To roll multiple dice (like 2d6 for a fireball or 3d8 for healing), set count to 2 or 3 and add the results together yourself. Set min=1, max=6, count=2 for a 2d6. The two numbers come back; add them in your head.
Modifiers like "+3" or "+STR" you add manually after generating. So a "1d20 + 5" attack roll = generate 1-20, then add 5.
If you roll dice constantly during a session, a dedicated dice roller app might be faster. For occasional rolls or DM screen-side checks, a random number generator is enough.
Sell Custom Apparel — We Handle Printing & Free ShippingAdvantage / Disadvantage
D&D 5e uses advantage (roll twice, take the higher) and disadvantage (roll twice, take the lower). With a random number generator:
- Set min=1, max=20, count=2.
- Click Generate. You get two numbers.
- For advantage: take the higher of the two.
- For disadvantage: take the lower of the two.
Same math the dice perform; same statistical distribution. The "no duplicates" checkbox does not apply here — you want both rolls, even if they happen to be the same number.
Is a Digital Roll as Fair as a Physical Die?
Yes — and arguably more fair. Physical dice have known biases:
- Casino-grade dice are precision-machined, but most D&D dice are mass-produced and slightly biased toward certain faces.
- Worn dice from repeated rolling develop subtle weight imbalances.
- Throw style affects results — some players have unconscious habits that bias outcomes.
our random number generator uses cryptographic randomness with no possible bias. Each face has exactly equal probability. For purists, a brand new precision die is fair. For everyone else, the digital roll is at least as fair as whatever d20 is in your bag.
Generate Random Numbers Now
Set your range, pick how many, optionally avoid duplicates. Cryptographically secure, runs in your browser, nothing logged.
Open Random Number GeneratorFrequently Asked Questions
Can I use a random number generator instead of dice?
Yes. Set min=1, max=die-size. A cryptographically secure RNG is at least as fair as a physical die.
How do I roll 2d6 with a random number generator?
Set min=1, max=6, count=2. The two results come back; add them in your head for the 2d6 total.
Is a digital d20 fair for D&D?
Yes. The browser's crypto random source produces unbiased uniform integers, mathematically identical to a perfect physical die.