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Spreadsheet Sim overview

Spreadsheet Sim lets you run Monte Carlo simulations on existing Excel workbooks without rewriting your model.

What it does​

You upload an .xlsx file, view it in the browser using IronCalc, mark uncertain cells as assumptions (assigning each a probability distribution), mark result cells as outputs, then run N simulation iterations. Each iteration samples new values for every assumption, recalculates the workbook, and records the output values. Results are visualized as histograms, one per output.

Who it's for​

Anyone with a business model, financial projection, or engineering estimate in Excel who wants to understand the range of possible outcomes — not just a single point estimate.

note

Spreadsheet Sim requires a Pro plan. Free users see an upgrade prompt.

Next steps​

  • Core concepts — key terms and mental model
  • How-to — uploading a workbook, configuring assumptions, running simulations, and reading results
  • Reference — config properties, fields, and parameters