Statistics
Category
Statistics Calculators
Classical statistics without mystery: mean, median, mode, standard deviation, combinations and permutations, and simple probability. Definitions follow textbook conventions so homework checks stay reproducible. Use these for exploratory looks at a small dataset — not as a substitute for a full statistics package or research design.
13 tools in this category — each page includes how-to steps, a worked example, formula notes, and FAQs.
- Students checking descriptive stats and counting rules
- Analysts doing quick sanity checks on small samples
- Anyone refreshing combinations, permutations, or probability
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Popular in Statistics
- Standard Deviation CalculatorSample or population standard deviation, variance, and mean.
- Sample Size CalculatorEstimate survey sample size from confidence level, margin of error, and optional population.
- A/B Test Sample Size CalculatorEstimate users needed per variant from baseline conversion %, absolute MDE, confidence, and power.
All Statistics tools
Showing 13 of 13
- Standard Deviation CalculatorSample or population standard deviation, variance, and mean.
- Z-Score CalculatorCompute how many standard deviations a value is from the mean.
- Percentile Rank (Simple)Approximate percentile rank of a score within a data set.
- Combination & PermutationCompute nCr and nPr for counting problems.
- Mean Confidence Interval (Approx)Approximate 95% CI for a mean using z≈1.96 (large sample).
- Mean Absolute DeviationAverage absolute distance of data points from the mean.
- Z-Score from Raw ScoreConvert a raw score to a z-score given mean and standard deviation.
- Margin of Error (Rough)Rough margin of error for a proportion: z × √(p(1−p)/n).
- Sample Size CalculatorEstimate survey sample size from confidence level, margin of error, and optional population.
- Margin of Error (Proportion)Approximate margin of error for a sample proportion using z critical value and sample size n.
- Pearson Correlation CalculatorCompute the Pearson correlation coefficient r from paired x,y observations.
- Simple Linear RegressionFit y = a + bx to paired data and report slope, intercept, and Pearson r.
- A/B Test Sample Size CalculatorEstimate users needed per variant from baseline conversion %, absolute MDE, confidence, and power.
Related categories
- MathBasic and scientific math, percentages, averages, algebra solvers, geometry (circle, Pythagoras), graphing, and showcase 3D tools — with formula notes you can check against homework.
- Science & EngineeringOhm’s law, kinetics, speed/distance/time, energy, and other textbook physics/engineering helpers with SI-friendly inputs for class and lab checks.
- EducationFinal grade needed, grade percentage, GPA-style helpers, and study-friendly math — match your syllabus weights before trusting a target score.
Looking for walkthroughs? See our guides on compound interest, EMI, mortgage, BMI, and percentage / tip / tax — or browse all calculators.