Math & Numbers
Convert US liquid quarts to US liquid gallons with configurable decimal precision
quart-to-gallonMath & Numbers
Fit a polynomial least-squares curve to paired numeric data and inspect coefficients, R squared, and predictions
polynomial-regression-calculatorMath & Numbers
Calculate exact, cumulative, and upper-tail Poisson probabilities from an expected event rate
poisson-distribution-calculatorMath & Numbers
Calculate union, independent intersection, complement, and at-least-one probabilities
probability-calculatorMath & Numbers
Calculate Pearson r, r squared, covariance, and confidence interval for paired numeric data
pearson-correlation-calculatorMath & Numbers
Calculate one or more percentiles for a numeric dataset with linear, nearest-rank, or exclusive methods
percentile-calculatorMath & Numbers
Convert a normal percentile, tail area, or central area into a standard normal z-score
percentile-to-z-score-calculatorMath & Numbers
Calculate population standard deviation from population variance using the n denominator
population-standard-deviation-calculatorMath & Numbers
Calculate Q1, median, Q3, interquartile range, and optional outlier fences for a numeric dataset
quartile-calculatorMath & Numbers
Calculate population variance with the n denominator for a complete numeric dataset
population-variance-calculatorMath & Numbers
Find all real and complex roots of a polynomial from a coefficient list using a numerical root finder
polynomial-roots-calculatorMath & Numbers
Solve quadratic equations, classify the roots, and return discriminant, vertex, and factor information
quadratic-equation-calculator