Statistics calculators

Probability, sampling, and descriptive statistics made readable.

Means, medians, standard deviations, confidence intervals, and sample size planning — with formulas and worked examples for each tool.

Calculators
103
Topics: All Descriptive (29) Probability (35)
103 results
Statistics / Descriptive

Quartile Calculator

Compute the five-number summary (min, Q1, median, Q3, max), interquartile range, and 1.5×IQR outliers from a list of num...

basic
1,681 4.2 1 min
Statistics / Probability

Z-score Calculator

Convert a raw value into a z-score using the mean and standard deviation of its distribution, and look up the correspond...

basic
15,617 4.1 1 min
Statistics / Probability

Bayes' Theorem Calculator

Compute the posterior probability P(A|B) from the prior P(A), the likelihood P(B|A), and the false-positive rate P(B|¬A)...

basic
23,498 3.9 1 min
Statistics / Probability

Lottery Odds Calculator

Compute the odds of winning a "pick k from n" lottery (e.g. 6/49) — the probability of matching all k drawn numbers, exp...

basic
19,395 4.0 1 min
Statistics

Odds Ratio Calculator

Compute the odds ratio from a 2×2 contingency table (exposed/non-exposed × outcome/no-outcome). OR > 1 means exposure is...

basic
7,930 4.6 1 min
Statistics / Probability

Poker Pot Odds Calculator

Compute pot odds (the ratio of the call amount to the total pot after the call), the required equity to make a profitabl...

basic
7,418 4.2 1 min