Randomness Lab – Dice, Coin & Random Integer

Added 2026-09-02

Run visual probability experiments with up to 20 dice, up to 20 coin flips with outcome percentages, or a random integer between two bounds. Results are generated locally in your browser.

✓ Runs locally in your browser✓ Uses the browser cryptographic random source when available✓ Roll up to 20 six-sided dice

Number of six-sided dice (1–20)

Total—

Mean—

Minimum—

Maximum—

Number of coins (1–20)

Heads—

Tails—

Heads %—

Tails %—

Minimum integer

Maximum integer

—

Choose an inclusive integer interval.

Recent experiments

No experiments yet.

Statistics / probability experiment. Designed for educational demonstrations, games and general-purpose random selection. No betting, wagering, payment or prize functions. Random values are generated locally with the browser cryptographic random source when available.

About this tool

A browser-based randomness and probability experiment tool for rolling up to 20 dice, flipping up to 20 coins with heads/tails statistics, and generating an integer within a chosen interval.

Common uses

dice rollervirtual dice rollercoin flipheads or tails

How it works

1Choose Dice, Coin or Random Integer mode.
2Set the number of dice or coins (up to 20), or enter the integer bounds.
3Run the experiment and inspect the visual result, frequencies, percentages, summary values and recent experiment history.

Frequently asked questions

Is this a gambling or betting tool?

No. Randomness Lab is designed for probability experiments, classroom demonstrations, games and general-purpose random selection. It has no wagering, payment or prize functions.

How are the random results generated?

The tool uses the browser Web Crypto random source when available and performs the experiment locally on your device.

How many dice can I roll at once?

You can roll from 1 to 20 standard six-sided dice in one experiment.

How many coins can I flip at once?

You can flip from 1 to 20 independent fair coins in one experiment and view heads/tails counts and percentages.