About Standard Deviation Calculator

Computes population and sample standard deviation, variance, mean, median, mode, range, and min/max for any numeric dataset. Accepts input one value at a time or in bulk via comma, space, or newline-separated text. Results display to four decimal places, and calculation history can be exported as CSV.

• Calculates both population (σ, divides by N) and sample (s, divides by N−1 using Bessel’s correction) standard deviation
• Reports variance, mean, median, mode, sum, min, max, and range alongside the primary result
• Bulk input parses numbers separated by commas, spaces, or newlines—handles mixed delimiters
• Includes four example datasets (test scores, heights, sales, temperature) for quick testing
• History stores up to 10 calculations with full values array, exportable to CSV

Frequently Asked Questions

When should I use population vs. sample standard deviation?

Use population (σ) when your data includes every member of the group you’re measuring. Use sample (s) when your data is a subset drawn from a larger population—which is almost always the case in practice. The sample formula divides by N−1 to correct for the bias introduced by estimating from incomplete data.

How many decimal places are shown?

All statistical results display to four decimal places. The full precision is preserved internally and in CSV exports.