Margin of error (proportion)

Client

Normal-approximation margin for survey proportions.

About Margin of error (proportion)

MOE ≈ z√(p(1−p)/n) for sample proportion. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

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Nearby workflows on Toolcore

  • Normal CDF (approx) — Φ(z) approximation from z-score using erf. when units or numeric output should be checked on a related calculator.
  • Sample mean — Arithmetic mean of comma-separated numbers. when units or numeric output should be checked on a related calculator.
  • Math expression evaluator — Evaluate basic + − × ÷ arithmetic with parentheses in your browser—no variables. when units or numeric output should be checked on a related calculator.
  • Z-score calculator — z = (x − μ) / σ from value, mean, and standard deviation. when units or numeric output should be checked on a related calculator.

Common use cases

  • Margin of error (proportion) for quick local checks without uploading data.
  • Copy results into tickets, docs, or classroom notes.

Common mistakes to avoid

  • Unexpected input shape

    See the intro and how-to notes for accepted formats.

FAQ

Is processing local?

Yes—this runs entirely in your browser.

Agent prefill?

Use q or qb for the main text field when supported.

More tools

Related utilities you can open in another tab—mostly client-side.