Stats Calculator Online
AP Statistics Calculators
Core calculators aligned with the AP Statistics curriculum. Free tools on Stats Calculator Online with formulas, how-to steps, similar calculator widgets, tidbits, and exportable reports.
- Mean, Median, Mode CalculatorCalculate arithmetic mean, median, and mode
- One-Sample t-Test CalculatorTest a sample mean against a hypothesized value
- Two-Sample t-Test CalculatorPooled or Welch t-test for two independent means
- Chi-Square Independence CalculatorTest association in contingency tables
- Normal Distribution CalculatorPDF, CDF, and quantiles of the normal
- Simple Linear Regression CalculatorFit y = a + bx with inference
- Binomial Distribution CalculatorPMF and CDF for binomial trials
- Mean Calculator CalculatorCompute the arithmetic mean of a data set
Tidbits from Stats Calculator Online
Best practice
Check assumptions before you trust p
Independence, normality (or large n), and equal variances matter for classic t/ANOVA. Use Welch or rank tests when they fail.
Two-sample t-test →Plan ahead
Power before you collect data
Fix the smallest meaningful effect and α, then compute sample size. Inflate n for dropout when recruiting humans.
Sample size calculator →Everyday math
Percent change ≠ percent of
Percent of is part÷whole. Percent change uses the starting value in the denominator—and +50% then −50% does not return to start.
Percentage calculators →
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Cross-topic picks from Stats Calculator Online
- One-Sample t-Test CalculatorHypothesis Testing · Test a sample mean against a hypothesized value
- Mean, Median, Mode CalculatorDescriptive Statistics · Calculate arithmetic mean, median, and mode
- Normal Distribution CalculatorProbability Distributions · PDF, CDF, and quantiles of the normal
- Simple Linear Regression CalculatorRegression Analysis · Fit y = a + bx with inference
- Chi-Square Independence CalculatorHypothesis Testing · Test association in contingency tables
- Sample Size & Power CalculatorHypothesis Testing · Plan sample size for desired power