Choose a die, then roll locally.
Rolled locally in your browser — nothing is sent to a server.
For casual decisions and simulations only. Not for regulated gaming, lotteries, audits, certifications, or cryptographic key generation.
This tool runs locally in your browser. Inputs and results are not transmitted or retained by BoringToolsKit.
Use this result
Share the current inputs or ask ChatGPT to explain the calculation in context.
What does this calculator estimate?
Rolling 2D6 produces totals from 2 to 12, with 7 the most likely outcome because six combinations sum to it. Each die face has equal probability.
- 2D6 totals range 2-12; 7 has 6 of 36 combinations (Wikipedia).
- Each standard die face has a 1/6 probability.
- The tool supports D4, D6, D8, D10, D12, and D20.
How dice probabilities work
Each die face is equally likely, so totals from multiple dice form a bell curve — 2D6 most often sums to 7. The roller simulates fair dice with a uniform random generator, useful for tabletop games and probability demos.
Limitations to watch for
The simulation is pseudorandom — cryptographically strong but not literally random. Physical dice have manufacturing bias; digital ones don't. Some games use exploding or advantage rules the tool doesn't model.
How to use it in practice
Pick the die (D20 for checks, D6 for damage, etc.) and count. Use totals for game mechanics. For probability teaching, roll many times and compare the distribution to the expected curve.
- Choose the die type.
- Set the number of dice.
- Read the rolls and total.
How this calculator works
Formula
Simulates rolls of standard dice (D4, D6, D8, D10, D12, D20) with a uniform random generator, summing multiple dice.
Worked example
Rolling 2D6 produces totals from 2 to 12, with 7 being the most likely.
Assumptions to verify
- Dice are fair (uniform distribution).
- Each roll is independent.
- Standard die types are sufficient.
Frequently asked questions
How does the dice roller work?
It generates uniform random rolls for standard dice — D4 through D20 — and totals them.
What dice does it support?
D4, D6, D8, D10, D12, and D20 — the standard tabletop set.
Why is 7 the most common 2D6 total?
More combinations sum to 7 than any other total — the distribution forms a bell curve.
Are the rolls fair?
Each face is equally likely, generated with a uniform pseudorandom source.
Can I roll with advantage?
Not directly — roll twice and take the higher yourself.
What is a D20 used for?
The classic d20 is the core die for checks and attacks in many RPGs.
How many dice can I roll?
Up to 10 at once — the tool sums them.
Cite this tool
BoringToolsKit. “Dice Roller.” boringtoolskit.com/dice-roller/ (reviewed 2026-08-25). Free to reference in articles, syllabi, and answer posts with a link.
Privacy: Inputs and results stay in this browser. Any future sponsored recommendation or advertisement will be clearly labeled and kept separate from the calculation.