Standard Deviation Calculator
Input Data
Enter your numerical data below, separated by commas, spaces, or new lines.
How to Use This Calculator
Enter your numbers, click Calculate, and read the results below. Here's what everything means.
Steps
1
Enter your data — paste or type numbers separated by commas, spaces, or new lines. Decimals use a dot (
15.5). Non-numeric text is ignored automatically.
2
Click "Calculate Statistics" — results appear immediately. Edit the data and click again to recalculate.
3
Export — download a PNG screenshot or a full PDF report including the table and chart.
Understanding the Output
Summary Statistics — count, sum, mean, median, min/max, range, Q1/Q3, IQR, and both population and sample variance & standard deviation.
Population (σ) vs. Sample (s): use population when your data is the entire group; use sample when it's a subset estimating a larger population.
Frequency Table — data grouped into up to 8 equal-width bins, showing frequency, relative frequency (%), and cumulative values.
Histogram — bar chart of the frequency table. Taller bars = more values in that range. Hover a bar to see the exact count.