Standard Deviation Calculator
Compute the standard deviation of a data set — sample or population — with variance, mean, and count.
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Compute the standard deviation of a data set — sample or population — with variance, mean, and count.
Pretty-print or minify any JSON document instantly, with clear line/column error reporting.
Find X% of a number, work out what percent one number is of another, and measure percentage change — instantly.
Enter TP, FP, FN, and TN and get every derived metric: accuracy, precision, recall, specificity, F1, and more.
Compute your grade point average on the standard 4.0 scale from your course credits and letter grades.
Count words, characters, sentences, and paragraphs in any text — with reading and speaking time estimates.
Find X% of a number, work out what percent one number is of another, and measure percentage change — instantly.
Test regular expressions live: matches with positions, capture groups, and flag validation.
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