Statistics Calculator
Paste a list of numbers to instantly get count, sum, mean, median, mode, min, max, range, quartiles (Q1/Q3), IQR, variance, and standard deviation — runs 100% in your browser with no upload.
🔒 Every number is crunched in your browser — nothing is uploaded.
Descriptive statistics in one paste
Enter your numbers separated by commas, spaces, or new lines and the table updates live with every common summary statistic: count, sum, mean, median, mode, min, max, range, the first and third quartiles (Q1/Q3), the interquartile range (IQR), variance, and standard deviation. Non-numeric tokens are ignored, so you can paste messy data straight from a spreadsheet column or a log file and still get clean results. Copy the whole summary as plain text with one click.
How each value is calculated
The mean is the sum divided by the count. The median is the middle value once sorted, or the average of the two middle values when the count is even. The mode lists every value that appears most often, and shows a dash when every number is unique. The quartiles split the sorted data into four parts: Q1 is the median of the lower half and Q3 the median of the upper half, computed with the median-of-halves method (for an odd count the overall median sits in neither half), and the interquartile range is Q3 − Q1. Variance and standard deviation use the population formula — the average of the squared distances from the mean — which is the right choice when your numbers represent the entire set rather than a sample.
Frequently asked questions
Do you use population or sample standard deviation?
Population. Variance is the average of the squared differences from the mean (dividing by the count n), and the standard deviation is its square root. This is correct when your list represents the whole population rather than a sample drawn from a larger one.
How are the quartiles calculated?
With the median-of-halves method (as used by the TI-83 and Moore & McCabe). The data is sorted, Q1 is the median of the lower half and Q3 the median of the upper half. For an odd number of values the overall median is excluded from both halves. The interquartile range (IQR) is Q3 minus Q1.
What happens to text or blank entries in my list?
They are ignored. The tool splits your input on commas, spaces, and line breaks, keeps only tokens that parse as finite numbers, and computes statistics from those. Negative numbers and decimals are fully supported.
Is my data uploaded anywhere?
No. Every calculation runs locally in your browser with JavaScript — your numbers never leave your device and nothing is sent to a server.