Tools

Calculate a paired t statistic from the mean and SD of within-pair differences.

Calculate Welch’s t statistic and approximate degrees of freedom for two independent groups.

Calculate a one-sample t statistic from a mean, hypothesized mean, SD and sample size.

Fit a simple linear regression line to paired X and Y observations.

Calculate Pearson’s r from paired numeric values.

Calculate sample or population covariance from paired X and Y values.

Combine two sample standard deviations into a pooled estimate.

Calculate the standard error of a mean from standard deviation and sample size.

Estimate a selected percentile from a numeric dataset.

Calculate the harmonic mean of positive non-zero values.

Calculate the geometric mean of positive numeric values.

Calculate Q1, median, Q3 and the interquartile range from raw data.

Find the minimum, maximum and range of a numeric dataset.

Convert liters, milliliters, microliters and common US volume units.

Convert common metric and imperial mass units.

Convert common metric and imperial length units.

Convert Celsius, Fahrenheit and Kelvin.

Add or subtract days from a selected calendar date.

Calculate total weeks and remaining days between two dates.

Remove repeated lines while preserving first occurrence order.

Convert text to uppercase, lowercase, title case or sentence case.

Measure how often a word or phrase appears in a block of text.

Estimate speaking duration from word count and speaking speed.

Count non-empty paragraphs and words in text.