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📊 Variance & Standard Deviation Calculator

Education-grade + research-grade descriptive statistics calculator: 13 core statistics (mean, median, mode, variance, SD, range, quantiles, IQR, ...) + 3 education modes (China high school / international / research) + denominator toggle (n-1 / n) + 3 SVG charts (histogram / box plot / QQ-plot) + normality tests (Jarque-Bera + D'Agostino K²) + 3-method outlier detection + multi-delimiter paste + 4-format export. Welford+Kahan compensated numerical core.

📊 Variance & SD Calculator

🌍 International
🔒 Local

Raw mode: paste a list of numbers directly.

Parse:
Examples:

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Free online variance & standard deviation calculator: enter a list of numbers and see mean, median, mode, sample/population variance & SD, range, quartiles Q1/Q3, and IQR — 13 core descriptive statistics — on one page. Supports pasting from Excel and mixed delimiters (comma, space, newline, semicolon, fullwidth). Core algorithm uses Welford + Kahan compensated recurrence, stable even for 1e15-scale inputs. Denominator mode toggles between sample (n-1) and population (n), covering Chinese high school math curriculum, international statistical conventions, and research use. In-browser computation, no data uploaded.