Pick a focus
Inference & tests
Confidence intervals, hypothesis tests, regression, and uncertainty.
Probability & simulation
Combinatorics, distributions, simulations, and probability trees.
Data visualization
Quick charts, histograms, box plots, and regression.
This page is an overview. Use the topics above for focused lists.
Quick guide
- Need confidence intervals or tests? Start with Inference & tests.
- Need simulation or combinatorics? Start with Probability & simulation.
- Need charts and summaries? Start with Data visualization.
Recommended (top 3)
If you are unsure where to start, these cover most “stats & probability” tasks.
Tools
- Quick charts from pasted data — scatter / box plot + regression (with steps, PNG/PDF)
Paste spreadsheet data to generate scatter and box plots instantly. Includes OLS, Theil–Sen, and polynomial regression with step-by-step math plus PNG/PDF export.
- Distribution sampler – random samples & histograms (normal, Poisson) | CalcBE
Generate random samples from common distributions (normal, log-normal, gamma, poisson, and more). Visualize histograms, check summary stats, and download CSV/JSON — runs locally in your browser.
- Permutation test – exact p-value for A/B and paired | CalcBE
Run a permutation (randomization) test for two independent groups or paired samples. Visualize the null distribution and download a JSON/CSV report — all in your browser.
Calculators
- Error propagation calculator – sums, products & powers | CalcBE
Propagate uncertainty for sums, products, powers and general functions using gradient×covariance steps, correlation options and Monte Carlo checks, with templates for common lab calculations.
- Hypergeometric calculator (without replacement) | CalcBE
Compute hypergeometric probabilities (without replacement): P(X=k), tails, and ranges. PMF chart/table, seeded simulation, share URL, and CSV.
- nCr & nPr calculator (permutations & combinations) | CalcBE
Compute nCr (combinations), nPr (permutations), and factorial (n!). Exact BigInt results, step logs, teacher mode, and shareable links.
- Normal Distribution & Z-Score Calculator – CDF, PDF, quantiles | CalcBE
Compute normal distribution CDF/PDF, z-scores, tail probability, intervals, and quantiles from mean (μ) and standard deviation (σ). Includes a shaded curve and steps.
- Probability Simulator — coin, dice, roulette (theory vs empirical, with steps) | CalcBE
Simulate coin tosses, dice rolls and roulette spins with a fixed seed to compare theoretical and empirical probabilities. Inspect confidence intervals, convergence charts and shareable runs.
- Probability tree & 2×2 table — AND/OR & complement | CalcBE
Probability tree & 2×2 table tool for AND/OR/NOT and complements. Highlights matching paths/cells and explains products, sums, and 1−P with steps. Copy a shareable URL, SVG, or LaTeX.
- Birthday paradox (collision probability) calculator | CalcBE
Calculate the birthday paradox collision probability with exact math + a Monte Carlo simulator. Get P(collision), P(no collision), a Poisson approximation with error, and the required sample size n for a target probab…
- Coupon collector calculator (expected draws) | CalcBE
Solve the coupon collector problem: expected draws, t50/t90/t99, P(T≤t), weighted rarities, and a reproducible Monte Carlo simulation.
- Distribution calculator – binomial, Poisson, t, chi-square | CalcBE
Compute PMF/PDF, CDF, quantiles, and exact confidence intervals for binomial, Poisson, Student's t, and chi-square distributions with step-by-step explanations, graphs, CSV, LaTeX, and shareable URLs.
- Linear Regression & Correlation — Scatter, OLS/WLS, R² (with steps) | CalcBE
Paste x,y[,w] data or upload a CSV to fit OLS, WLS or Theil–Sen regression. See the fitted line, 95% bands, residual plots and key tests on one interactive chart.
- Histogram & cumulative frequency from grouped data | CalcBE
Enter grouped or raw data to build a derived frequency table, histogram (frequency or frequency density), and cumulative frequency ogive. Detect unequal widths, highlight modal/median classes, copy a shareable URL, an…
- Descriptive Statistics + Box Plot & Histogram (with steps) | CalcBE
Paste a dataset or upload CSV/TSV to review descriptive statistics, histogram, box plot, outlier counts, trimmed mean, CSV export, LaTeX summary, and documented steps.
- CI & Hypothesis Test Wizard (Means & Proportions) | CalcBE
Build confidence intervals and hypothesis tests for means and proportions. Supports Welch, paired, Wilson, Newcombe, and visualises p-values.