Standard Deviation Calculator

Free standard deviation calculator with mean, median, mode, variance, and population/sample std dev — 100% client-side. 100% serverless.

🔒 100% Private

⚡ Completely Free

🌐 Runs in Browser

📦 Export Ready

Enter Data — Comma-separated numbers.
Calculate — Get count, mean, median, mode, std dev, variance, min/max.
Copy — Copy all results.

Enter a dataset and instantly get comprehensive statistics including mean, median, mode, standard deviation (population and sample), variance, and range.

Features

Population and sample std dev
Mean, median, mode
Min, max, range

Privacy

All calculations run in your browser.

Frequently Asked Questions

What's the difference between population and sample std dev?

Population (σ) divides by n, sample (s) divides by n-1. Use sample for datasets that are a subset of a larger population.

What statistics are calculated?

Count, sum, mean, median, mode, population σ, sample s, variance, min, max, and range.

Is my data safe?

Yes. 100% in your browser.

Standard Deviation Calculator — Free Statistics Tool