🔢 Math Tools
Calculators for percentages, statistics, and everyday math problems. 27 free tools. No signup required.
Standard Deviation Calculator
Calculate mean, median, mode, std dev, and more
Use tool →Percentage Calculator
Calculate percentages, percent change, and more
Use tool →Sample Size Calculator
Calculate the sample size needed for your survey or study
Use tool →Confidence Interval Calculator
Calculate confidence intervals for means and proportions
Use tool →T-Test Calculator
Compare two sample means and get t statistic and p-value instantly
Use tool →Chi-Square Calculator
Test categorical counts for fit or independence in seconds
Use tool →ANOVA Calculator
Compare three or more groups and test for mean differences
Use tool →Normal Distribution Calculator
Find z-scores, PDF, CDF, and interval probabilities instantly
Use tool →Confusion Matrix Calculator
Turn TP, FP, FN, and TN counts into core ML metrics
Use tool →Regression Metrics Calculator
Measure model error with MAE, MSE, RMSE, MAPE, and R-squared
Use tool →Z-Score Calculator
Calculate z-scores and probabilities for normal distributions
Use tool →Combinations & Permutations Calculator
Calculate C(n,r) and P(n,r) instantly with step-by-step formulas
Use tool →Probability Calculator
Calculate basic, compound, Bayesian, and binomial probabilities
Use tool →Linear Regression Calculator
Find the best-fit line and R² for any dataset
Use tool →Correlation Coefficient Calculator
Calculate Pearson r and determine correlation strength
Use tool →P-Value Calculator
Convert test statistics to p-values for any distribution
Use tool →Binomial Distribution Calculator
Calculate exact and cumulative binomial probabilities
Use tool →Poisson Distribution Calculator
Calculate Poisson probabilities for any rate and event count
Use tool →Percentile Calculator
Find any percentile and convert values to percentile ranks
Use tool →Outlier Calculator
Detect outliers with IQR fences or z-score thresholds
Use tool →Bayes' Theorem Calculator
Update probabilities with Bayes' theorem instantly
Use tool →Min-Max Normalization Calculator
Scale any dataset to a custom range instantly
Use tool →Train/Validation/Test Split Calculator
Calculate exact sample counts for each ML data split
Use tool →Cosine Similarity Calculator
Calculate the cosine similarity between two vectors instantly
Use tool →IoU Calculator
Compute Intersection over Union for two bounding boxes
Use tool →CNN Output Size Calculator
Trace CNN feature map dimensions through conv and pooling layers
Use tool →Softmax Calculator
Convert model logits to a probability distribution instantly
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