Statistics
Statistics tools summarize lists, compute sample or population spread, and handle common planning formulas such as sample size and confidence intervals.
Sample versus population is a choice you make — the page does not guess which denominator you meant.
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Statistics Calculator
Paste a list and get count, mean, median, mode, range, and both sample and population variance and SD.
Mean Median Mode Range
Paste a list of numbers to get the mean, median, mode and range in one place.
Standard Deviation
Paste a list of numbers and choose sample (n − 1) or population (n) standard deviation.
Descriptive Statistics
Statistics Calculator
Paste a list and get count, mean, median, mode, range, and both sample and population variance and SD.
Mean Median Mode Range
Paste a list of numbers to get the mean, median, mode and range in one place.
Standard Deviation
Paste a list of numbers and choose sample (n − 1) or population (n) standard deviation.
Number Sequence
Find the nth term and the sum of an arithmetic or geometric sequence.
Probability
Statistical Inference
Z-score Calculator
Convert a value to a z-score, or a z-score back to the original scale, given a mean and standard deviation.
Confidence Interval
Build a z-interval for a mean from x̄, a standard deviation, n and a confidence level.
Sample Size
Estimate how many observations a proportion survey needs for a chosen confidence level and margin of error.
All statistics tools
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9 tools
Standard Deviation
Paste a list of numbers and choose sample (n − 1) or population (n) standard deviation.
Number Sequence
Find the nth term and the sum of an arithmetic or geometric sequence.
Sample Size
Estimate how many observations a proportion survey needs for a chosen confidence level and margin of error.
Probability Calculator
Combine two event probabilities as independent, mutually exclusive, or overlapping, plus complements and “at least one”.
Statistics Calculator
Paste a list and get count, mean, median, mode, range, and both sample and population variance and SD.
Mean Median Mode Range
Paste a list of numbers to get the mean, median, mode and range in one place.
Permutations & Combinations
Compute P(n, r) when order matters and C(n, r) when it does not, for whole numbers n ≥ r ≥ 0.
Z-score Calculator
Convert a value to a z-score, or a z-score back to the original scale, given a mean and standard deviation.
Confidence Interval
Build a z-interval for a mean from x̄, a standard deviation, n and a confidence level.