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15 calculators

Statistics & probability calculators

Descriptive statistics, distributions, sample sizes, confidence intervals and combinatorics.

A–Z index of all calculators

B
C
G
M
N
O
P
S
Z

B

Bayes' theorem Posterior probability from a prior, a sensitivity and a false positive rate — the medical-test problem, worked properly.
Binomial probability Exactly k successes, at most k, and at least k, in n independent trials.

C

Confidence interval Confidence interval for a mean from the sample mean, standard deviation and size.
Correlation Pearson correlation and the regression line for five paired observations.

G

Grade needed on the final What you need on a final exam to reach a target overall grade.

M

N

Normal distribution Probability below, above and between values on a normal curve, plus the density at a point.

O

Odds and probability Convert between probability, fractional odds, decimal odds, American odds and log-odds.

P

S

Sample size How many responses you need for a target margin of error, with the finite population correction.

Z

Z-score Convert a value to a z-score and read off the percentile and both tail probabilities.

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