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.
Calculate Now β { }JSON Formatter & Validator
Format, validate, and beautify JSON instantly. Free JSON formatter with error highlighting.
Calculate Now β π§ΉRemove Duplicates Tool
Remove duplicate lines, words, or values from any list. Free dedup tool with case-sensitivity options.
Calculate Now β π§½Text Cleaner Tool
Remove extra spaces, tabs, blank lines and invisible characters from pasted text, with word and character counts. Runs in your browser.
Calculate Now β πExcel to CSV Converter (Copy & Paste)
Paste cells copied from Excel or Google Sheets and get clean CSV text. Commas inside cells are quoted automatically. Nothing is uploaded.
Calculate Now β πCorrelation Matrix Generator
Paste a CSV of numeric columns to get the Pearson correlation for every pair of columns in one matrix. Free, in-browser.
Calculate Now β π€Dataset Summary Statistics Generator
Paste a column of numbers to get count, mean, median, standard deviation, min, max and range in one click. Free.
Calculate Now β