1. What is a D20 Roll?

A D20 roll is a random number between 1 and 20, typically generated by rolling a 20-sided die. It's commonly used in tabletop role-playing games like Dungeons & Dragons to determine the success or failure of actions.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( \text{rand}(1,20) \) — Random integer between 1 and 20
• \( \text{Modifiers} \) — Numerical bonuses or penalties applied to the roll

3. Understanding Modifiers

Details: Modifiers represent character abilities, skills, or situational bonuses/penalties. They can be positive or negative numbers that adjust the raw dice roll.

4. Using the Calculator

Tips: Enter your total modifiers in the input field. Click "Roll D20" to generate a random result between 1 and 20, plus your modifiers.

5. Frequently Asked Questions (FAQ)

Q1: What does "natural 20" mean?
A: A natural 20 is when the dice roll is exactly 20 before modifiers. In many games, this is an automatic success or critical hit.

Q2: What about a natural 1?
A: A natural 1 (before modifiers) is often considered a critical failure or fumble in game systems.

Q3: Can I use negative modifiers?
A: Yes, the calculator accepts both positive and negative modifier values.

Q4: How random are the results?
A: The calculator uses PHP's random number generator which is suitable for gaming purposes but not cryptographically secure.

Q5: Can I roll multiple dice at once?
A: This calculator is designed for single D20 rolls. For multiple dice, you would need to use the calculator multiple times.