Z-test proportion

Client

z = (p̂ − p₀)/√(p₀(1−p₀)/n)—enter successes,n,p0.

p̂=0.5500, z ≈ 1.0000

Nearby workflows on Toolcore

  • Sample size (proportion) — n ≈ z²pq/e² for proportion estimates. when units or numeric output should be checked on a related calculator.
  • Bayes theorem — P(A|B) = P(B|A)P(A)/P(B)—enter as decimals. 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.
  • Percentage calculator — Percent of a value, ratio to percent, and percent change—no server round-trip. when units or numeric output should be checked on a related calculator.

About this tool

One-proportion z statistic.

Common use cases

  • Z-test 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.