Roll 1d20
1d20 rolls from 1 to 20 with an average of 10.5. It rolled once when the page loaded; press Roll for another.
Choose your roll
Use a quick die, type notation such as 2d6+3, or configure the dice and modifier separately.
Roll 1d20
Quick rolls
Dice ready
Your next roll lands here.
The total, individual dice, dropped values, and a running history of up to 20 rolls will stay together.
This page rolls a single 20-sided die (1d20) the moment it loads and again every time you press Roll. Results run from 1 to 20 with an average of 10.5. In D&D 5e the d20 decides attack rolls, saving throws, ability checks, and initiative. A natural 20 on an attack is a critical hit.
Questions
- What is the average roll of 1d20?
- The average of a single d20 is 10.5: every face from 1 to 20 is equally likely, so the expected value is (1 + 20) divided by 2.
- How do I add a modifier to 1d20?
- Type the full expression in the dice notation field, for example 1d20+3 or 1d20-1, and press Roll notation. The total shown includes the modifier.
- Is this dice roller free?
- Yes. Every tool on Tools and Taverns is free, with no account, signup, or roll limit. The roll runs in your browser and nothing is sent to a server.
- Can I see my previous rolls?
- Yes. The roller keeps your last 20 rolls on screen with the individual dice for each, so a contested result is still there when someone asks what you got.