1. What is a D20 Dice Roll?

A D20 dice roll generates a random number between 1 and 20, simulating the roll of a twenty-sided die commonly used in tabletop role-playing games like Dungeons & Dragons.

2. How Does the Calculator Work?

The calculator uses PHP's random number function:

Where:

• 1 — Minimum possible value
• 20 — Maximum possible value

Explanation: The function generates a uniformly distributed random integer between the specified minimum and maximum values.

3. Importance of Random Number Generation

Details: Random number generation is essential for gaming, statistical sampling, cryptography, and various applications where unpredictable outcomes are required.

4. Using the Calculator

Tips: Simply click the "Roll Dice" button to generate a random number between 1 and 20. The result will appear instantly in the result box.

5. Frequently Asked Questions (FAQ)

Q1: Is the dice roll truly random?
A: The calculator uses PHP's pseudo-random number generator which is sufficiently random for most gaming purposes, though not cryptographically secure.

Q2: Can I roll multiple dice at once?
A: This calculator rolls a single D20 die. For multiple dice, you would need to use the calculator multiple times or modify the code.

Q3: What is the probability distribution?
A: Each number from 1 to 20 has an equal 5% chance of being rolled, making it a uniform distribution.

Q4: Can I use this for critical hits in games?
A: Yes, this is perfect for determining critical hits, skill checks, and other game mechanics that require a D20 roll.

Q5: How does this compare to physical dice?
A: Digital dice rolls eliminate physical bias and provide instant results, though some players prefer the tactile experience of physical dice.