Math & Numbers
Calculate Student t distribution PDF, CDF, tail probability, two-tail probability, and central area
t-distribution-calculatorMath & Numbers
Calculate PDF, CDF, survival probability, and interval probability for a continuous uniform distribution
uniform-distribution-calculatorMath & Numbers
Calculate standard normal PDF, CDF, tail probability, two-tail probability, and central area from a z-score
standard-normal-calculatorMath & Numbers
Calculate Spearman rank correlation for paired numeric data with tied-rank handling
spearman-correlation-calculatorMath & Numbers
Calculate sample and population skewness to measure distribution asymmetry
skewness-calculatorMath & Numbers
Calculate Q1, Q3, IQR, and optional 1.5 x IQR outlier fences for a numeric dataset
interquartile-range-calculatorMath & Numbers
Calculate a z-score from a raw value using a dataset or manually entered mean and standard deviation
z-score-calculatorMath & Numbers
Convert a z-score into normal-distribution percentile, tail probability, or central area
z-score-to-percentile-calculatorMath & Numbers
Calculate mean absolute deviation around the mean or median for an easy-to-read spread measure
mean-absolute-deviation-calculatorMath & Numbers
Calculate sample standard deviation from sample variance using the n - 1 denominator
sample-standard-deviation-calculatorMath & Numbers
Calculate sample variance with the n - 1 denominator for estimating spread from a sample dataset
sample-variance-calculatorMath & Numbers
Calculate sample and population standard deviation, variance, coefficient of variation, and sigma intervals
standard-deviation-calculator