D100 Dice Roller
Roll a d100 for a number from 1 to 100. Every value has an equal 1% chance. Add more dice or a modifier by editing the expression.
Roll d100
Type standard dice notation like 2d6+3, d20 or 1d8+1d4+2. Up to 10 terms, 100 dice per term and 1,000 sides per die.
Probability for d100
Min
1
Average
50.50
Max
100
Too many possible totals to list (100). The range and average above still apply.
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Start with d100
The box is filled with d100. Press Roll (or Enter) to get a number from 1 to 100.Change the expression if you need to
Try 2d100 for two dice added together, d100+10 for a bonus, or d100-5 for a penalty. Presets under the box give you common examples.Read the breakdown
The result shows the total and each individual die, so you can check the math or apply your game's rules to the separate values.
Tips & Tricks
Roll-under checks
In systems that use a roll-under skill check, compare the d100 result to your skill value. A skill of 60 succeeds on a roll of 60 or lower, a 60% chance.
Random tables
Many RPG books have tables numbered 1-100. Roll a d100 and read the matching row. Each row spans a range that reflects how likely it should be.
Percent chances in real life
A d100 is a handy way to settle a probability. To act with 30% probability, roll and act only on 30 or lower.
Rolling two d100
Adding two d100 (2d100) gives totals from 2 to 200, and the middle values are much more likely than the extremes, unlike a single d100 where every number is equally likely.
Frequently Asked Questions
What is a d100?
A d100 is a hundred-sided die, or more commonly a pair of ten-sided dice used together, that gives a number from 1 to 100 with every value equally likely. It is also called a percentile die because the result reads as a percentage.
How do percentile dice work with physical dice?
You roll two ten-sided dice: one marked 00, 10, 20 ... 90 for the tens, and one marked 0-9 for the ones. Add them together. By the usual convention, 00 and 0 together count as 100.
Is the result of this d100 roller fair?
Yes. Each roll uses your browser's cryptographic random number generator with an unbiased method, so every number from 1 to 100 has the same 1% chance.
How do I roll more than one d100, or add a modifier?
Type it in the box above using dice notation. For example 2d100 rolls two hundred-sided dice and adds them, and d100+10 adds 10 to the roll. Use a minus sign to subtract.
What games use a d100?
Several tabletop systems use percentile rolls, including Call of Cthulhu, where you generally try to roll at or under your skill value, and many random tables in fantasy RPGs. Check your game's rules for exactly how it reads the result.
What are the odds of rolling under a certain number?
On a d100, the chance of rolling at or under a number N is N percent. So rolling 50 or lower is 50%, and rolling 25 or lower is 25%.
Can I roll other dice here?
Yes. Type any expression such as d20, 4d6+2 or 1d8+1d4. For the dice roller with animated dice and D4 to D100 buttons, see our main dice roller.