Compute population and sample standard deviation with variance, mean, median, and range for any dataset — exam scores, lab readings, quality checks. A class scoring 70±8 reads spread at a glance — free, runs locally.
Content reviewed October 2026 · About Toolzum
Compute mean, median, and mode for any dataset with distribution insight. See why averages mislead skewed data — free, local, no signup.
Compute your overall course percentage from comma-separated assignment grades and their matching weights — Exam Heavy presets included. Numbers never leave your device — every calculation runs locally in your browser.
Compute semester GPA from course grades and credit hours with credit-weighted math on the standard 4.0 scale — quick academic snapshot. See what straight B's earn — free, local, no signup.
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Spread around the mean: scores 70±8 cluster tightly, 70±20 scatter widely. Same average, opposite stories — SD reveals which dataset to trust.
Population and sample SD together with variance, mean, median, range, and count — one paste serves the whole lab report.
Dozens to hundreds paste cleanly as comma or space separated lists. Strip labels and units first — stray text breaks parsing.
No — statistics compute locally in your browser. Data never leaves your device.
10, 12, 23, 23, 16, 23, 21, 16 gives count 8, mean 18.0000, median 21 (upper-middle of the sorted list), range 10–23, population SD 4.8990, sample SD 5.2372, variance 24.0000. You need at least 2 numeric values, comma/space/tab separated — stray text blanks the result.