Statistics
Mean, median, mode, variance, standard deviation, and probability calculations.
Bayes' Theorem Calculator
Free Bayes' theorem calculator to compute conditional probability P(A|B) from prior and likelihood probabilities. Essential for statistics and data science.
Binomial Probability Calculator
Free binomial probability calculator to find the probability of exactly k successes in n independent trials with a given success rate. Uses the binomial formula.
Chi-Square Test Calculator
Free chi-square calculator to compute the chi-square statistic from observed and expected frequency values. Test goodness of fit and statistical independence.
Combination Calculator (nCr)
Free combination calculator to compute nCr — the number of ways to choose r items from n where order does not matter. Uses the combinations formula with factorials.
Confidence Interval Calculator
Free confidence interval calculator to compute the margin of error and confidence interval for a population mean at 90%, 95%, or 99% confidence levels.
Correlation Calculator
Free correlation calculator to compute the Pearson correlation coefficient (r) and R² from paired data. Measure the strength of linear relationships.
Coefficient of Variation
Free coefficient of variation calculator to measure relative variability of a dataset by dividing standard deviation by the mean. Compare dispersion across groups.
Factorial Calculator
Free factorial calculator to compute n! (n factorial) for any non-negative integer. Used in permutations, combinations, probability, and advanced mathematics.
Mean Calculator
Free mean calculator to compute the arithmetic average of any set of numbers. Enter your data and get the mean, sum, and count of values instantly.
Median Calculator
Free median calculator to find the middle value of any dataset. Sorts your numbers and identifies the median, useful for statistics and data analysis tasks.
Mode Calculator
Free mode calculator to find the most frequently occurring value(s) in any dataset. Identifies single mode, bimodal, or multimodal distributions instantly.
Permutation Calculator (nPr)
Free permutation calculator to compute nPr — the number of ways to arrange r items from n where order matters. Uses the permutation formula with factorials.
Basic Probability
Free probability calculator to compute the likelihood of an event as favorable outcomes divided by total outcomes. Get results as fractions and percentages.
Range & IQR Calculator
Free range and quartile calculator to find the range, Q1, Q2, Q3, and interquartile range (IQR) of any dataset. Quickly analyze data spread and distribution.
Linear Regression Calculator
Free linear regression calculator to find the best-fit line equation (y = a + bx) from a set of data points. Compute slope, intercept, and R² value instantly.
Variance & Std Dev Calculator
Free variance and standard deviation calculator for any dataset. Computes both population and sample variance with step-by-step breakdowns for statistics.
Weighted Mean Calculator
Free weighted mean calculator to compute the weighted average of values with different weights. Ideal for GPA calculations, portfolio returns, and survey data.
Z-Score Calculator
Free z-score calculator to compute the standard score and corresponding percentile for any data point. Determine how many standard deviations from the mean.