Dice Roller · Practical guide
Roll a D100 (Percentile Dice) Online
One hundred faces, one click — a fair 1-100 result for percentile systems and random tables.
At a glance
How to Roll a D100 Here
Set the roller above to 1 die and 100 sides and you have a digital d100. Each result from 1 to 100 has an equal 1% chance, which is exactly what percentile-based games assume. The total box shows your number, and the history keeps the last 10 rolls for reference.
Interactive tool
Dice Roller
Enter your own values, then compare the result with the examples below.
Roll Result
History (Last 10)
What Percentile Dice Are For
Systems like Call of Cthulhu, Warhammer Fantasy, and RuneQuest resolve actions with percentile dice: you roll d100 and succeed if the result is at or under your skill rating. A character with a 65% Persuade skill succeeds on any roll of 65 or lower — a straight 65% chance. Random loot and encounter tables also use d100 ranges, such as 01-50 for a common result, 51-85 uncommon, and 86-100 rare.
Odds Quick Reference
| Roll Needed | Chance |
|---|---|
| 50 or lower | 50% |
| 65 or lower | 65% |
| 10 or lower | 10% |
| 96-100 (top band) | 5% |
| Exactly 100 | 1% |
D100 Versus Two D10s
Physical percentile sets use two ten-sided dice — one for tens, one for units — read together (00 and 0 counts as 100). A single digital d100 produces the identical distribution without any reading conventions, and it avoids the classic table argument about whether 00 plus 7 means 7 or 107.
Frequently Asked Questions
Is a digital d100 as fair as physical percentile dice?
Yes. A cryptographically secure random pick from 1 to 100 has exactly the same flat 1% distribution as rolling two physical d10s and combining them.
How do I read a result for a roll-under skill check?
If the number is less than or equal to your skill percentage, you succeed. Rolling a 42 against a 60% skill is a success; rolling a 78 is a failure.
Can I roll multiple d100s at once?
Yes. Set the dice count up to 20 with 100 sides each — useful for generating a whole loot batch or a party's worth of checks in one click.
What counts as a critical success on percentile dice?
It depends on the system. Many games treat a roll of 01-05 as a critical success and 96-100 as a fumble, but check your game's rules.