Math & Statistics Tools

Descriptive statistics, growth calculations and number-base conversion.

Correlation Calculator Measures how strongly two columns move together, with Pearson and Spearman side by side.
Data Size Converter Converts data sizes and shows the decimal and binary conventions side by side, because they are not the same.
Descriptive Statistics Summarises a column of numbers with the full set of descriptive measures, sample and population both.
Frequency Distribution Bins numbers into a frequency table with counts, percentages and a text histogram.
Growth Rate Turns a series into period-on-period change, cumulative change and a compound growth rate.
Number Base Converter Converts a list of numbers between bases and refuses to silently truncate a value that is invalid in the base you chose.
Percentage Calculator Handles the four percentage questions people actually ask, over a whole list at once.
Percentile Calculator Calculates percentiles both ways — interpolated and nearest-rank — so you can see where the two definitions disagree.
Sample Size Calculator Works out how many records you need to sample for a stated confidence and margin of error.
Weighted Average Calculates a weighted mean and shows what each row contributed, next to the unweighted mean.
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