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Statistics and probability
Summarize values, compare distributions and calculate chances.
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- Binomial distribution calculatorCalculate exact-count and cumulative probabilities for independent trials with a fixed success probability.
- Card draw probability calculatorFind hypergeometric probabilities for drawing exactly k marked cards without replacement.
- Coefficient of variation calculatorSample coefficient of variation = sample standard deviation ÷ mean × 100.
- Confidence interval calculatorCalculate a two-sided normal confidence interval for a mean when the population standard deviation is known.
- Correlation calculatorPearson correlation measures the linear association between matching numeric observations.
- Gacha probability calculatorCalculate the chance of at least one success with 1 − (1 − p)ⁿ.
- Linear regression calculatorFit the least-squares line y = intercept + slope × x for paired numeric data.
- Normal distribution calculatorFind lower-tail and upper-tail probabilities for a normal distribution from its mean and standard deviation.
- Percentile calculatorFind a percentile in your own list of numbers.
- Poisson distribution calculatorFind event-count probabilities for a Poisson process with your expected count per interval.
- Probability calculatorCombine event probabilities using their overlap: P(A or B) = P(A) + P(B) − P(A and B).
- Probability distribution calculatorCalculate mean and variance for a discrete distribution with values and probabilities you supply.
- Sample size calculatorPlan a proportion estimate using n₀ = z²p(1 − p)/error², with optional finite-population correction.
- Statistics calculatorGet mean, median, mode, spread and quartiles from a list.
- Z score calculatorSee how far a value is above or below the mean.
