Basic Statistics Calculator

Calculate descriptive statistics including mean, median, mode, standard deviation, variance, geometric and harmonic means.

Basic Statistics Calculator

Calculate descriptive statistics including mean, median, mode, standard deviation, variance, geometric and harmonic means.

Sorted Dataset
10, 15, 20, 20, 25, 30

Descriptive Statistics Summary

Count (n)6
Sum (Σx)120
Arithmetic Mean20
Median20
Mode20
Range20
Standard Deviation (σ)6,455
Variance (Population)41,6667
Geometric Mean18,8597
Harmonic Mean17,6471
Minimum10
Maximum30
38.645 viewsYour data is processed in your browser and never sent to a server.

Related tools

Percentage Calculator
Calculate percentages and percentage change instantly. Free and private.
VAT Calculator
Add or remove VAT from a price with an adjustable rate. Free and private.
Age Calculator
Calculate the exact age between two dates instantly. Free and private.
Date Calculator
Calculate duration and working days difference between two selected dates.

Get to know this tool

What is the Basic Statistics Calculator Tool?

Basic Statistics Calculator is a free utility that computes the most common descriptive statistics for any list of numbers — useful for students, teachers, analysts, or anyone who needs a quick summary of a dataset without opening a spreadsheet. Enter your numbers, click Calculate, and get instant results, all computed locally in your browser.

Key Features

  • Count (n): The number of valid values found in your list.
  • Mean (Average): The arithmetic average of all values.
  • Median: The middle value when the dataset is sorted (the average of the two middle values for an even-sized dataset).
  • Mode: The most frequently occurring value or values. If no value repeats, the mode shows as "None."
  • Range: The difference between the maximum and minimum values.
  • Standard Deviation: A measure of how spread out the values are from the mean (population standard deviation).
  • 100% Client-Side: All math runs locally in your browser. Your numbers are never uploaded or stored.

How to Use the Basic Statistics Calculator

  1. Enter your numbers into the input field, separated by commas (e.g. 10, 15, 20, 20, 25, 30).
  2. Click Calculate.
  3. Review the result cards: count, mean, median, mode, range, and standard deviation.

Frequently Asked Questions

What happens if I enter invalid or non-numeric values?

Any value that can't be parsed as a number is ignored automatically; only valid numbers are included in the calculation.

What if all my numbers are different (no repeats)?

The mode will show as "None" since there's no single value that appears more often than the others.

Is this standard deviation the sample or population version?

The calculator computes the population standard deviation (dividing by the total count, not count minus one).

Is this tool free to use?

Yes, the Basic Statistics Calculator is completely free and requires no signup.