How to Roll a d100 in DND: A Simple Percentile Dice Guide
If you are new to DND, rolling a d100 can feel weird the first time.
You look at your dice set. You see a d20, a d12, a d10, another strange d10 with 00, 10, 20, 30 on it… but no actual 100-sided die.
So you ask the very normal beginner question:
“How do I roll a d100 if I don’t have a 100-sided die?”
Don’t worry. Most DND players do not use a real 100-sided die at the table. The common way to roll a d100 is to use two ten-sided dice: one percentile die and one regular d10.
If you buy a standard 7-piece or 11-piece dice set from URDICE, the percentile die, also called the D%, is already included by default. You do not need to buy a separate d100 just to make percentile rolls.
The trick is simple:
- The percentile die gives the tens digit
- The regular d10 gives the ones digit
- Together, they create a number from 1 to 100
For example:
If you roll 40 and 7, your result is 47.
If you roll 00 and 0, your result is 100.
That last one is where many new players get stuck. So let’s make it easy.
Quick Answer: How Do You Roll a d100?
To roll a d100, roll a percentile die and a regular d10 together.
The percentile die usually shows:
00, 10, 20, 30, 40, 50, 60, 70, 80, 90
The regular d10 usually shows:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
You combine the two dice to get your result.
| Percentile Die | Regular d10 | d100 Result |
|---|---|---|
| 20 | 6 | 26 |
| 50 | 3 | 53 |
| 70 | 0 | 70 |
| 00 | 8 | 8 |
| 00 | 0 | 100 |
The most important rule:
00 + 0 means 100, not zero.
Once you understand that, rolling a d100 becomes much easier.
What Is a d100 Roll in DND?
A d100 roll means you are rolling for a result from 1 to 100.
In DND books, rules, or random tables, you may see it written as:
1d100
That means:
Roll once to get a number between 1 and 100.
You usually roll a d20 when the game needs to know whether something succeeds or fails. Attacks, saving throws, and ability checks normally use a d20.
A d100 works differently. It is often used when the game needs to pick from a bigger list.
For example, a DM might say:
“You open the old chest. Roll a d100 for treasure.”
Now the roll is not asking, “Do you open the chest?”
You already opened it.
The d100 is asking:
“What exactly is inside?”
Maybe you find a few coins.
Maybe you find a potion.
Maybe you find a cursed ring.
Maybe you find something the DM did not expect either.
That is why d100 rolls are fun. They feel like opening a mystery box.
What Dice Do You Need to Roll a d100?
You need two ten-sided dice:
| Dice | What It Does |
|---|---|
| Percentile die / D% | Gives the tens digit |
| Regular d10 | Gives the ones digit |
| Both together | Create a result from 1 to 100 |
A standard DND dice set usually includes both.
At URDICE, our standard 7-piece dice sets and 11-piece dice sets include the D% by default, so you already have the correct dice for d100 rolls.
This matters for beginners because many new players think they are missing a die.
You are not.
That strange die with 00, 10, 20, 30 on it is exactly what you need.
Step-by-Step: How to Roll a d100
Now let’s get back to the real question: how to roll a d100.
I’ll break it into four simple steps.
Step 1: Find the Percentile Die
First, find the die with numbers like:
00, 10, 20, 30, 40, 50, 60, 70, 80, 90
This is your percentile die, or D%.
It tells you the tens part of the roll.
For example:
- If it shows 30, your result is somewhere in the 30s.
- If it shows 80, your result is somewhere in the 80s.
- If it shows 00, your result is a single-digit number unless the other die is also 0.
This is the die that makes d100 rolls look confusing at first, but it is also what makes them easy once you understand it.
Step 2: Find the Regular d10
Next, find the regular d10.
This die shows single digits:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
This die gives the ones digit.
For example:
- Percentile die: 60
- Regular d10: 4
- Result: 64
You are not adding damage dice here. You are building a number.
Think of it like reading a two-digit number on paper.
The percentile die gives the first part.
The d10 gives the last part.
Step 3: Roll Both Dice Together
Roll both dice at the same time.
This is what usually happens at the table:
The DM says, “Roll a d100.”
You pick up the D% and the regular d10.
Someone new at the table says, “Wait, which one is which?”
You point to the D% and say, “This one is tens.”
Then you roll.
That small moment is very normal. Almost every new DND player asks this once.
If you have a percentile die, it is easy because the tens die already has 00, 10, 20, and 30 on it.
If you only have two regular d10 dice, choose which die is the tens die before you roll.
For example:
“The red die is tens. The black die is ones.”
Do not choose after rolling. Choose first, then roll.
Step 4: Read the Result
After the dice land, combine the numbers.
Here are common examples:
| Roll | Result |
|---|---|
| 40 + 6 | 46 |
| 80 + 2 | 82 |
| 70 + 0 | 70 |
| 00 + 5 | 5 |
| 00 + 0 | 100 |
The roll 70 + 0 means 70.
The roll 00 + 5 means 5.
The roll 00 + 0 means 100.
That is the part to memorize.
Once you know those three examples, you can read almost any d100 roll.
The 00 Problem: Why 00 + 0 Means 100
The most confusing d100 result is always:
00 + 0
New players often ask:
“Is that zero?”
No.
In DND, a d100 roll gives a number from 1 to 100. There is no zero result on a normal d100 table.
So when both dice show zero, the result is 100.
Here is the easiest way to remember it:
| Roll | Read It As |
|---|---|
| 00 + 1 | 1 |
| 00 + 2 | 2 |
| 00 + 7 | 7 |
| 00 + 9 | 9 |
| 00 + 0 | 100 |
This is the one rule that makes percentile dice click.
If you are teaching a new player, do not start with a long math explanation. Just show them this table.
It works better.
A Real Table Example
Let’s say your party defeats a monster and finds a locked wooden chest.
The rogue opens it.
Your DM checks a treasure table and says:
“Roll a d100.”
You roll the percentile die and the regular d10.
The dice land on:
30 and 8
Your result is 38.
The DM looks at the table and says:
“You find a small pouch of silver coins and a cracked blue gem.”
Simple.
Now imagine you roll:
00 and 0
Everyone at the table looks up.
The DM smiles.
That is 100.
Maybe you just found the rarest result on the table.
That is why d100 rolls feel special. They are not the rolls you make every five minutes. They usually show up when something random, rare, or strange is about to happen.
Can You Roll a d100 with Two Regular d10 Dice?
Yes. You can roll a d100 with two regular d10 dice.
You just need to choose one die as the tens die before rolling.
For example:
- Red d10 = tens
- Blue d10 = ones
Then roll both.
| Red d10 | Blue d10 | Result |
|---|---|---|
| 4 | 2 | 42 |
| 8 | 9 | 89 |
| 0 | 6 | 6 |
| 0 | 0 | 100 |
This works.
But for beginners, a real percentile die is easier because it already shows tens numbers.
That is why standard DND dice sets include both a d10 and a D%.
Do You Need a Real 100-Sided Die?
No. You do not need a real 100-sided die to play DND.
A true d100 can be fun as a novelty die, but it is not the normal way most players roll at the table.
A real 100-sided die can be:
- harder to read
- slower to stop rolling
- more likely to roll across the table
- less convenient than two d10 dice
Two ten-sided dice are faster and clearer.
That is why most players use a percentile die plus a regular d10.
When Do You Roll a d100 in DND?
You roll a d100 when the game asks for a result from 1 to 100.
Common examples include:
| Situation | Why d100 Is Used |
|---|---|
| Treasure tables | To decide what loot appears |
| Random encounter tables | To decide what the party meets |
| Magic item tables | To choose a rare or unusual item |
| Wild magic effects | To create chaotic results |
| Percentage chances | To check if something rare happens |
| DM homebrew tables | To create more possible outcomes |
For most normal actions, you still roll a d20.
If you attack a goblin, roll a d20.
If you sneak past a guard, roll a d20.
If you resist a spell, roll a d20.
But if the DM says, “Roll for what happens,” and the table has 100 possible results, that is when you roll a d100.
Common Mistakes When Rolling a d100
Mistake 1: Thinking 00 + 0 Means Zero
This is the big one.
Correct answer:
00 + 0 = 100
Not zero.
Mistake 2: Reading 00 + 8 as 108
A d100 roll cannot be 108.
Correct answer:
00 + 8 = 8
Mistake 3: Treating the Dice Like Normal Addition
If you roll 40 and 6, the answer is 46.
That looks like addition, but the idea is different.
You are not adding two damage dice.
You are reading a tens digit and a ones digit together.
Mistake 4: Choosing the Tens Die After the Roll
If you use two regular d10 dice, decide which one is tens before rolling.
Do not roll first and then pick the better result.
At a real table, clarity matters.
Quick d100 Reading Chart
Use this chart if you are still learning.
| Percentile Die | If d10 Shows 0 | If d10 Shows 1–9 |
|---|---|---|
| 00 | 100 | 1–9 |
| 10 | 10 | 11–19 |
| 20 | 20 | 21–29 |
| 30 | 30 | 31–39 |
| 40 | 40 | 41–49 |
| 50 | 50 | 51–59 |
| 60 | 60 | 61–69 |
| 70 | 70 | 71–79 |
| 80 | 80 | 81–89 |
| 90 | 90 | 91–99 |
This chart solves most d100 confusion.
You can keep it open during your first few sessions until the pattern feels natural.
Final Answer: How to Roll a d100
To roll a d100 in DND, use two ten-sided dice.
Use the percentile die for the tens digit.
Use the regular d10 for the ones digit.
Then read them together.
Examples:
- 30 + 4 = 34
- 70 + 0 = 70
- 00 + 6 = 6
- 00 + 0 = 100
That is it.
You do not need a real 100-sided die. If your dice set includes a D%, you already have what you need.
And after you understand 00 + 0, the whole thing becomes much easier.
The first time may feel awkward. The second time makes sense. After that, you will read d100 rolls without thinking.
That is when percentile dice start to feel like part of the game instead of a strange extra die in the set.
