Tested
Confidence Interval Calculator
Confidence interval for a mean (t or z).
Statistics Calculators
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Free statistics calculators for everyday questions, from quick checks to detailed breakdowns.
Statistics tools (8)
- Tested
Effect Size (Cohen's d) Calculator
Cohen's d for two groups.
Statistics Calculators
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Margin of Error Calculator
Margin of error for a mean or a proportion.
Statistics Calculators
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Odds Ratio Calculator
Odds ratio from a 2×2 table.
Statistics Calculators
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Point Estimate Calculator
Point estimates of a proportion (MLE, Laplace and Wilson).
Statistics Calculators
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Relative Risk Calculator
Relative risk from a 2×2 table.
Statistics Calculators
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Sample Size Calculator
Sample size for estimating a mean or a proportion.
Statistics Calculators
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Standard Error Calculator
Standard error of a mean or a proportion.
Statistics Calculators
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All statistics calculators by topic (59)
Descriptive
- Coefficient of Variation Calculator
- Descriptive Statistics Calculator
- Geometric Mean Calculator
- Harmonic Mean Calculator
- Interquartile Range Calculator
- Mean Absolute Deviation Calculator
- Mean Calculator
- Mean Median Mode Calculator
- Mean Median Mode Range Calculator
- Median Calculator
- Midrange Calculator
- Mode Calculator
- Outlier Calculator
- Percentile Calculator
- Quartile Calculator
- Range Calculator
- Relative Frequency Calculator
- Relative Standard Deviation Calculator
- Standard Deviation Calculator
- Sum of Squares Calculator
- T-Score (Standardized) Calculator
- Variance Calculator
Distributions
Hypothesis Tests
Inference
Probability
About statistics calculators
Statistics Calculators help you turn a question into a clear, checkable answer. Each tool lists its inputs, shows the formula it relies on and explains how to read the result.
Browse by topic using the filters, or search for a specific tool. Tools that are still being built are clearly marked as previews and are not presented as finished calculators.
Frequently asked questions
Are the statistics calculators calculators free?
Yes. Every calculator on Calculator Atlas is free to use and requires no sign-up.
How are results verified?
A calculator is only published after its formula has been implemented, tested against reference values and reviewed. Pages still in development are labeled as previews.