Statistics Calculator — Descriptive statistics turn a long list of numbers into a few numbers that describe the whole list at a glance — how big the typical value is, how spread out it is, and where most of the values cluster. This calculator handles the standard set: count, sum, min, max, range, mean, median, mode, variance, standard deviation, and the 25th / 75th percentiles (Q1 / Q3).
Your numbers are processed entirely in your browser. Nothing is uploaded — close the tab and the data is gone.
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Statistics Calculatorとは？
Descriptive statistics turn a long list of numbers into a few numbers that describe the whole list at a glance — how big the typical value is, how spread out it is, and where most of the values cluster. This calculator handles the standard set: count, sum, min, max, range, mean, median, mode, variance, standard deviation, and the 25th / 75th percentiles (Q1 / Q3).
Paste any whitespace- or comma-separated list of numbers, hit Compute, and read the results. Useful for grades, experiment data, finance, and quick sanity checks before pushing data into a spreadsheet or a stats package.
使い方
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Enter your numbers
Paste any list separated by spaces, commas, or new lines.
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Compute
Press the button or just keep typing — results update as you go.
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Read the results
Central tendency (mean / median / mode) and spread (variance / std dev / IQR) are shown side by side.
使用例
Test scores for a class
Ten scores out of 100. Want to know the class average and how spread out the grades are.
78 82 91 65 88 73 95 81 70 84
結果： Mean 80.7 · Median 81.5 · Std dev 8.96 · Range 30
Daily pageviews for a week
Quick sanity check before logging into a real analytics tool.
1240, 980, 1110, 1450, 1320, 1075, 1690
結果： Mean 1266 · Median 1240 · Std dev 226 · Range 710
よくある質問
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Last reviewed: 2026-09-25