Statistics Tools & Calculators
Free, precise tools for working with data — summarise a data set, measure its spread, standardise a value, size a study, test a correlation, and convert data units in a click.
Mean, Median & Mode Calculator
Paste any list of numbers to get the mean, median, mode, count, sum, minimum, maximum, and range at once — the core measures of central tendency and spread
Standard Deviation Calculator
Calculate variance and standard deviation for both the population and the sample, plus the mean — a fast read on how tightly your data clusters around its average
Z-Score Calculator
Convert a raw value into a standard score from the mean and standard deviation, and see the percentile it falls at under the standard normal distribution
Sample Size Calculator
Find how many responses your survey needs for a chosen confidence level and margin of error using Cochran's formula, with an optional finite-population correction
Correlation Calculator
Compute the Pearson correlation coefficient and R² between two paired data series, with a plain-language strength label — measure how strongly two variables move together
Data Size Converter
Convert between bytes, KB, MB, GB, and TB using binary (base-1024) units — a quick reference for file sizes, storage capacity, dataset volumes, and sensor logs