Compute mean, median, and mode for any dataset with distribution insight. See why averages mislead skewed data — free, local, no signup.
Content reviewed October 2026 · About Toolzum
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.
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.
Compute simple probability as favorable outcomes divided by total outcomes — coin flips, dice rolls, card draws. See 3 in 10 read as 30.0% instantly — free, local, no signup.
Scan and clear cookies, localStorage, and sessionStorage for the current site — see what's stored first. Audit privacy trackers before wiping — local inspection, free, no signup.
Compute gross margin from revenue and costs — know exact profitability. A $30 sale at $20 cost margins 33% — free, local, no signup.
Mean averages all values (outlier-sensitive); median takes the middle (robust). Billionaire-in-room datasets need medians.
Most frequent value(s) — sizes, votes, categories. Datasets can be bimodal; the tool lists all modes.
Mean far above median signals right skew (a few huge values). Report both, never mean alone.
No — statistics compute locally in your browser. Data never leaves your device.
For 2, 4, 4, 4, 5: mean is 19 ÷ 5 = 3.8, median (middle value) is 4, mode (most frequent) is 4. Same average family, three different stories.