Data & Analytics Calculators

70 free data & analytics calculators in Math.

A/B Test Duration CalculatorWork out how long an A/B test must run to reach its required sample size.
A/B Test Sample Size CalculatorCalculate the sample size needed per variant to detect a given lift.
A/B Test Significance CalculatorTest whether the difference between two conversion rates is statistically significant.
Absolute Risk Reduction CalculatorCalculate absolute risk reduction and the number needed to treat.
AIC CalculatorCompare models using the Akaike information criterion.
Attribution Model CalculatorCompare how attribution models split conversion credit across touchpoints.
Autocorrelation CalculatorMeasure autocorrelation at a given lag and test for serial dependence.
Bayes Factor CalculatorCalculate a Bayes factor to compare the evidence for two hypotheses.
Bootstrap Sample Size CalculatorDetermine the number of bootstrap resamples needed for stable estimates.
CAC Payback Period CalculatorCalculate how many months it takes to recover customer acquisition cost.
Coefficient of Variation CalculatorExpress standard deviation relative to the mean for scale-free comparison.
Cohen's D CalculatorCalculate Cohen’s d with the small-sample Hedges correction.
Cohort Retention CalculatorTrack retention across periods for a cohort and find where users are lost.
Confidence Band CalculatorCalculate a confidence band around a fitted regression line.
Confidence Level CalculatorConvert between confidence level, critical value and margin of error.
Critical Value CalculatorFind critical values for one and two-tailed tests at a chosen significance level.
Degrees of Freedom CalculatorCalculate degrees of freedom for common statistical tests.
Effect Size CalculatorCalculate a standardised effect size between two group means.
Exponential Moving Average CalculatorCalculate an exponential moving average and its smoothing factor.
Extrapolation CalculatorExtend a trend beyond the observed data and quantify the growing uncertainty.
Fisher Exact Test CalculatorCalculate the Fisher exact test probability for a 2×2 contingency table.
Forecast Error CalculatorMeasure forecast accuracy using absolute, squared and percentage error metrics.
Geometric Growth CalculatorProject geometric growth and find the constant rate that links two values.
Harmonic Mean Rate CalculatorCalculate the harmonic mean, the correct average for rates and ratios.
Hedges G CalculatorCalculate Hedges’ g, the small-sample corrected standardised mean difference.
Kendall Tau CalculatorCalculate Kendall’s tau rank correlation from concordant and discordant pairs.
Kruskal Wallis CalculatorPerform a Kruskal-Wallis test comparing three or more independent groups.
Kurtosis CalculatorMeasure the tail weight of a distribution relative to a normal distribution.
Likelihood Ratio CalculatorCalculate positive and negative likelihood ratios for a diagnostic test.
Linear Interpolation CalculatorEstimate a value between two known data points.
Mann Whitney U CalculatorPerform a Mann-Whitney U test comparing two independent samples.
Mean Absolute Percentage Error CalculatorCalculate MAPE and understand its limitations near zero.
Monte Carlo Sample Size CalculatorDetermine how many Monte Carlo iterations are needed for a target precision.
Moving Average CalculatorCalculate a simple moving average and the smoothing it provides.
Net Revenue Retention (NRR) CalculatorCalculate net and gross revenue retention from expansion, contraction and churn.
NPS CalculatorCalculate Net Promoter Score from promoter, passive and detractor counts.
Number Needed to Harm CalculatorCalculate the number needed to harm from adverse event rates.
Number Needed to Treat CalculatorCalculate the number needed to treat and compare it against harms.
Partial Correlation CalculatorCalculate the correlation between two variables controlling for a third.
Point Biserial Correlation CalculatorCalculate the correlation between a binary and a continuous variable.
Power Analysis CalculatorCalculate statistical power for a given effect size and sample size.
Prediction Interval CalculatorCalculate a prediction interval for a single new observation.
Probability Ratio CalculatorCompare two probabilities as a ratio and as an odds ratio.
R SquaredFree R Squared calculator with clear step-by-step results.
Regression Coefficient CalculatorCalculate the slope coefficient of a simple linear regression and test it.
Regression Intercept CalculatorCalculate the intercept of a linear regression and interpret it correctly.
Relative Risk Reduction CalculatorCalculate relative risk reduction from control and treatment event rates.
Residual Standard Error CalculatorCalculate residual standard error and what it says about model fit.
Risk Ratio CalculatorCalculate relative risk between an exposed and unexposed group.
ROAS/ROI CalculatorCalculate return on ad spend and true return on investment after cost of goods.
Root Mean Square CalculatorCalculate the root mean square of a set of values.
Seasonality Index CalculatorCalculate seasonal indices and deseasonalise a series.
Sign Test CalculatorPerform a sign test on paired data using only the direction of differences.
Skewness CalculatorMeasure the asymmetry of a distribution and what it implies for analysis.
Spearman Rank CalculatorCalculate Spearman’s rank correlation from ranked data.
Standard Error CalculatorCalculate the standard error of a mean and how it shrinks with sample size.
Standard Error of Mean CalculatorCalculate the standard error of a sample mean with a finite population correction.
Standard Error of Proportion CalculatorCalculate the standard error and margin of error for a sample proportion.
Statistical Power CalculatorCalculate the power of a proportion test and the effect it can detect.
Survey Margin CalculatorCalculate the margin of error for a survey result at a chosen confidence level.
Survey Response Rate CalculatorCalculate survey response rate and the completed responses a target requires.
Tracking Signal CalculatorDetect systematic forecast bias using a tracking signal.
Trend Projection CalculatorProject a linear trend forward and quantify its fit.
Trimmed Mean CalculatorCalculate a trimmed mean that discards extreme values before averaging.
Variance Inflation Factor CalculatorDetect multicollinearity between predictors using the variance inflation factor.
Viral Coefficient CalculatorCalculate the viral k-factor and whether growth is self-sustaining.
Weighted Mean CalculatorCalculate a weighted average where observations carry different importance.
Weighted Moving Average CalculatorCalculate a weighted moving average that emphasises recent periods.
Wilcoxon Test CalculatorPerform a Wilcoxon signed-rank test for paired non-parametric data.
Winsorized Mean CalculatorCalculate a Winsorized mean where extreme values are capped rather than discarded.