Math & Numbers
Run an independent two-sample t test with pooled variance from raw data or summary statistics
two-sample-t-test-calculatorMath & Numbers
Run Welch two-sample t tests for independent groups with unequal variances from raw data or summary statistics
welch-t-test-calculatorMath & Numbers
Run one-sample Z tests for a mean with known population standard deviation or a single population proportion
z-test-calculatorMath & Numbers
Calculate Cohen d, Hedges g, Cohen h for proportions, or correlation r effect sizes from summary statistics
effect-size-calculatorMath & Numbers
Run a one-sample t test from raw data or summary statistics, including p-value and confidence interval
one-sample-t-test-calculatorMath & Numbers
Estimate statistical power for one-sample mean or proportion tests using sample size, alpha, and expected effect
statistical-power-calculatorDesign
Analyze a WebP/VP8 image with Sharp, generate a grayscale displacement map, and render it as an interactive Three.js 3D relief surface
vp8-image-analyzerMath & Numbers
Calculate F distribution density, cumulative probability, and right-tail probability from numerator and denominator degrees of freedom
f-distribution-calculatorMath & Numbers
Calculate the margin of error for a mean or proportion from sample size, confidence level, and variability
margin-of-error-calculatorMath & Numbers
Calculate one-tailed or two-tailed p-values for Z, t, chi-square, and F test statistics
p-value-calculatorMath & Numbers
Calculate PDF, CDF, survival probability, and interval probability for an exponential distribution
exponential-distribution-calculatorMath & Numbers
Calculate exact and cumulative probabilities for sampling without replacement
hypergeometric-distribution-calculator