Stats Calculator Online
Experimental Design Calculators
A/B tests, sample size, randomization, and factorial plans. Free tools on Stats Calculator Online with formulas, how-to steps, similar calculator widgets, tidbits, and exportable reports.
- A/B Testing CalculatorCompare conversion rates and lift
- Survey Sample Size CalculatorSample size for survey proportions
- Randomization CalculatorRandomly assign units to arms
- Factorial Design Planner CalculatorPlan 2^k factorial experiments
- Crossover Design CalculatorAnalyze 2x2 crossover trials
- Fractional Factorial Design CalculatorPlan 2^(k−p) run sizes
- Plackett–Burman Design CalculatorScreening design run-size planner
- Box–Behnken Design CalculatorResponse-surface design size planner
- Central Composite Design CalculatorCCD run counts for k factors
- Sample Size with FPC CalculatorSurvey n with finite population correction
Tidbits from Stats Calculator Online
Tidbit
A p-value is not the probability H₀ is true
It is the probability of data at least as extreme as yours if H₀ were true. Pair it with an effect size and confidence interval.
P-value calculator →Need a path?
Not sure which test to run?
Start with the statistical test selector, then open the matching calculator with formulas and APA export.
Test selector →Remember
Correlation is not causation
Pearson r measures linear association. Plot the scatter first, and prefer Spearman when the relationship is monotonic but not linear.
Correlation tools →
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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