Free STEM Calculators & Tools

Essential calculators for math, chemistry, physics, and statistics. Built for students, by students.

Standard Deviation Calculator

Calculate standard deviation, variance, and mean for any data set. Supports both population and sample calculations.

Poisson Distribution Calculator

Calculate Poisson probabilities for rare events. Find cumulative probabilities and distribution properties.

Chi-Square Test Calculator

Perform chi-square goodness of fit and independence tests. Calculate test statistics and p-values.

T-Test Calculator

Perform one-sample, two-sample, and paired t-tests. Calculate test statistics, p-values, and effect sizes.

Confidence Interval Calculator

Calculate confidence intervals for means and proportions. Find required sample sizes for desired precision.

Percentile Calculator

Calculate percentiles, percentile ranks, and quartiles. Get five-number summaries and identify outliers.

Linear Regression Calculator

Calculate linear regression line of best fit. Find slope, intercept, R-squared, and make predictions.

Correlation Calculator

Calculate Pearson correlation coefficient. Determine strength and direction of linear relationships.

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