Standard Deviation Calculator
Last updated: June 1, 2026Sample & population standard deviation.
Standard Deviation Calculator is a free online calculator to sample & population standard deviation. It runs entirely in your browser, so your files never leave your device — nothing is uploaded. There's no sign-up, no watermark, and it works on any modern browser on desktop or mobile.
How to use Standard Deviation Calculator
Paste your numbers and instantly get the sample and population standard deviation, variance, mean and count. Free, accurate and private — runs in your browser. It runs entirely in your browser, so it's fast, private and free — no software to install.
- 1Enter your numbers.
- 2See the result update instantly.
- 3Adjust the inputs to compare scenarios.
Free to use
No watermarks and no forced sign-up. Free credits to get started.
Private by design
Runs in your browser — your files never leave your device.
Fast & simple
A clean interface, instant results, and it works on any device.
Standard Deviation Calculator — frequently asked questions
Is Standard Deviation Calculator free?
Yes. Standard Deviation Calculator is free to use — no watermarks and no forced sign-up. New visitors get free credits to start, and you can upgrade any time for more.
Is Standard Deviation Calculator safe and private?
Standard Deviation Calculator runs entirely in your browser. Your files never leave your device and nothing is uploaded to a server.
Do I need to create an account to use Standard Deviation Calculator?
No account is required. Open the tool and start right away.
Does Standard Deviation Calculator work on mobile?
Yes — it works in any modern browser on phones, tablets and desktops.
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