How does Probability Experiment Simulator make its random choices?

Every trial uses an independent Web Crypto draw mapped to the experiment's equal or explicit weighted outcome space.

Does Probability Experiment Simulator upload my inputs or results?

No. Values stay in the current browser tab and are not placed in the URL, analytics, storage, or network requests.

When should I use Probability Experiment Simulator?

Use it to demonstrate experimental versus theoretical probability or verify how a declared categorical model behaves over many trials.

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Probability Experiment Simulator

Repeat coins, dice, cards, spinners, or custom categorical trials and compare observed frequencies with stated probabilities. The complete workflow runs locally in this browser, with visible controls and a result you can inspect before copying or downloading.

LOCAL WORKBENCH

Generate a result

No upload · no account · no URL storage

Choose your settings, then select Generate.

How it works

Build the exact finite outcome model from the chosen experiment and validate custom weights when used.
Run the requested number of independent secure trials while retaining bounded preview output.
Report counts, observed percentages, expected percentages, and absolute frequency differences by category.

Worked example

After 1,000 fair-coin trials, the table shows heads and tails counts against an expected 50% each.

Limits and interpretation

Runs are capped at 100,000 trials and preview output at 200 outcomes.
Short runs can differ substantially from expected probabilities by chance.
Card-suit mode samples with replacement and does not simulate a depleted deck.

Privacy

Your inputs and generated results stay in this browser. This tool does not put them in a URL, analytics event, server log, or external request.

Frequently asked questions

How does Probability Experiment Simulator make its random choices?: Every trial uses an independent Web Crypto draw mapped to the experiment's equal or explicit weighted outcome space.
Does Probability Experiment Simulator upload my inputs or results?: No. Values stay in the current browser tab and are not placed in the URL, analytics, storage, or network requests.
When should I use Probability Experiment Simulator?: Use it to demonstrate experimental versus theoretical probability or verify how a declared categorical model behaves over many trials.