Compute averages, weighted averages, probability, or standard deviation for a small dataset.
When this calculator is useful
When to use the probability calculator
This page highlights common situations where the probability calculator can save time, reduce mistakes, and help you make faster decisions.
Try it in situations like these
Sanity-check survey, lab, or analytics output without booting a stats package.
Re-run the probability calculator as new data points come in to see how the result shifts.
Use the output to support a quick comparison or report, then verify with full software.
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Open the calculator
Run your own numbers instantly.
Understand the calculation
See how the result is calculated.
Read the guide
See the step-by-step instructions.