π Statistics & Probability
Standard deviation, z-score, regression, confidence interval and probability tools.
Standard Deviation Calculator
Calculate sample and population standard deviation, variance, mean, and range from any list of numbers. Free online tool.
Calculate Now β ΟΒ²Variance Calculator
Calculate sample and population variance from any dataset. Free variance calculator with mean and SD output.
Calculate Now β πZ Score Calculator
Calculate z-score from a value, mean, and standard deviation. Free z-score calculator with probability lookup.
Calculate Now β πP Value Calculator
Calculate p-value from a z-score or t-score. Free p-value calculator for one-tailed and two-tailed tests.
Calculate Now β πConfidence Interval Calculator
Calculate 90%, 95%, 99% confidence intervals for a mean or proportion. Free online CI calculator.
Calculate Now β πMargin of Error Calculator
Calculate margin of error for any survey or poll. Free MOE calculator with confidence level options.
Calculate Now β π§ͺSample Size Calculator
Calculate the required sample size for any survey or A/B test. Free sample size calculator with power analysis.
Calculate Now β πLinear Regression Calculator
Fit a linear regression line to your data. Free regression calculator with slope, intercept, RΒ², and predictions.
Calculate Now β πCorrelation Calculator (Pearson r)
Calculate Pearson correlation coefficient between two variables. Free correlation calculator with strength interpretation.
Calculate Now β π²Probability Calculator
Compute binomial probability, single-event probability, and combinations. Free probability calculator for AP Stats and analysts.
Calculate Now β βStatistical Significance Calculator
Test if your A/B test result is statistically significant. Free significance calculator with p-value and confidence.
Calculate Now β πCSV to JSON Converter
Convert CSV to JSON instantly in your browser. Free CSV to JSON converter with custom delimiter support.
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Format, validate, and beautify JSON instantly. Free JSON formatter with error highlighting.
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Remove duplicate lines, words, or values from any list. Free dedup tool with case-sensitivity options.
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Clean text by removing extra spaces, line breaks, special characters. Free online text cleaner.
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Convert Excel (XLSX) files to CSV instantly in your browser. Free Excel to CSV converter, no upload required.
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Generate correlation heatmaps for any dataset. Free online heatmap with Pearson correlation matrix.
Calculate Now β π€AI Dataset Summary Generator
Upload a CSV and get an instant AI-generated summary with key statistics, patterns, and suggested next analyses. Free.
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