Standard Deviation Calculator
Paste a list of numbers — get mean, median, mode, sample + population standard deviation, variance, min/max/range, Q1/Q3, IQR. Complete descriptive statistics in one tool.
What powers the Standard Deviation Calculator
Mean, median, mode
Sample SD (n−1) and population SD (n)
Variance (both formulas)
Min, max, range
Q1, Q3, IQR
Handles comma / space / newline input
Why the Standard Deviation Calculator is different
Browser-native
The Standard Deviation Calculator runs entirely in your browser. Input is processed locally — never uploaded, never logged, never cached anywhere outside your device.
No artificial limits
No daily quotas, no character ceilings, no "upgrade for more" walls. Every feature is the complete feature — the same on the first use as the thousandth.
Production-grade quality
Built to the same engineering bar as paid SaaS tools — accurate algorithms, audited logic, responsive design and accessibility-tested interactions.
Common use contexts
- Statistics homework
- Data analysis quick-check
- A/B test result review
- Engineering quality control
Private and secure
Zero upload
All processing happens in your browser. Input is never transmitted, logged or cached.
Works offline
Once the page loads, the tool runs without an internet connection. No network calls happen during use.
No tracking
No accounts, no cookies for tool state. Only aggregate analytics count visits at the page level.